CN113431419A - Contact for high-rise tower and preparation method thereof - Google Patents
Contact for high-rise tower and preparation method thereof Download PDFInfo
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- CN113431419A CN113431419A CN202110803593.5A CN202110803593A CN113431419A CN 113431419 A CN113431419 A CN 113431419A CN 202110803593 A CN202110803593 A CN 202110803593A CN 113431419 A CN113431419 A CN 113431419A
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- connecting pipe
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- 238000005266 casting Methods 0.000 claims abstract description 153
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- 238000003466 welding Methods 0.000 claims abstract description 36
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- 230000000171 quenching effect Effects 0.000 claims description 36
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 18
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 12
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 3
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- 239000011733 molybdenum Substances 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
- E04H12/10—Truss-like structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a joint for a towering tower, which comprises a base pipe seat, a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a seventh connecting pipe and an eighth connecting pipe, wherein the axes of the first connecting pipe, the second connecting pipe and the third connecting pipe are coplanar to form a first plane, the axes of the fourth connecting pipe, the fifth connecting pipe and the sixth connecting pipe are coplanar to form a second plane, the seventh connecting pipe is positioned between the first plane and the second plane, the axes of all the connecting pipes are intersected at the central point of the base pipe seat, and the element content of the joint is as follows by weight percent: 0.15-0.25% of C, 0.30-0.60% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, less than or equal to 0.12% of Mo, 0.30-0.80% of Ni, 0.10-0.03% of Nb0.10, less than or equal to 0.30% of Cu, less than or equal to 0.015% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurities. The invention has good support, reasonable stress system and good mechanical property. The invention also provides a preparation method of the contact for the towering tower, which comprises the steps of casting mold → smelting modeling → demoulding → welding repair → heat treatment → detection.
Description
Technical Field
The invention relates to the field of joints, in particular to a joint for a high-rise tower and a preparation method thereof.
Background
With the rapid development of social economy, the national vibration-enhanced country construction, the improvement of living conditions in mountainous areas, the acceleration of industrial development and the vigorous support of the electric automobile industry are the first problems of power supply, the electric automobile needs to be charged with electric piles, the electric automobiles can not be separated from electric power construction, a large number of high-rise towers are used in the electric power construction, because some cable laying needs to span the sea, the river, the mountain and the like and are large-span, the height of the high-rise towers is designed to reach about 300m, the requirements on stress systems and the supportability of joints among steel pipes of the high-rise towers are high, welding points are reduced as far as possible, and when the number of the steel pipes is large and the support weight is heavy, the welding points are easy to crack and the collapse of the high-rise towers can be caused. Since the high tower is used for power supply in different areas, the weather and the natural environment are also varied, firstly, the joint has good atmospheric corrosion resistance, if the corrosion resistance of the salt of the joint is required to be considered in coastal areas, and the acid corrosion resistance is required to be considered in areas with much rainfall. Therefore, the contact has high requirements on the structure, the yield strength, the tensile strength, the elongation and the corrosion resistance of the material, and therefore, a new scheme for solving the problems is urgently needed.
Disclosure of Invention
The invention aims to provide a joint for a high-rise tower, which can be used for connecting a plurality of steel pipes to meet the design requirement of the high-rise tower, reducing welding points, having a reasonable stress system and providing stable support.
In order to achieve the technical purpose and achieve the technical requirements, the invention adopts the technical scheme that: a joint for a high-rise tower comprises a base pipe seat, wherein two connecting ends of the base pipe seat are internally provided with a connecting cavity, the base pipe seat is provided with a first connecting pipe, a second connecting pipe and a third connecting pipe which are communicated with each other, the axes of the first connecting pipe, the second connecting pipe and the third connecting pipe are coplanar to form a first plane, the base pipe seat is also provided with a fourth connecting pipe, a fifth connecting pipe and a sixth connecting pipe which are communicated with each other, and the axes of the fourth connecting pipe, the fifth connecting pipe and the sixth connecting pipe are coplanar to form a second plane, the included angle between the first plane and the second plane is 90 degrees +/-10 degrees, a seventh connecting pipe is arranged on the base pipe seat, and the seventh connecting pipe is positioned between the first plane and the second plane, the base pipe seat is provided with an eighth connecting pipe which is back to the second connecting pipe, the axes of all the connecting pipes are intersected at the central point of the base pipe seat, and connecting cavities are arranged in the connecting ends of all the connecting pipes.
As a preferred technical scheme: and the axis of the seventh connecting pipe is coincided with the angle bisector of the first plane and the second plane.
As a preferred technical scheme: the second connecting pipe is perpendicular to the base pipe seat, the axis of first connecting pipe is 45 with the axis contained angle of second connecting pipe, the axis of third connecting pipe is 45 with the axis contained angle of second connecting pipe, the fifth connecting pipe is perpendicular with the base pipe seat, and the axis of fourth connecting pipe is 45 with the axis contained angle of fifth connecting pipe, the axis of sixth connecting pipe is 45 with the axis contained angle of fifth connecting pipe.
As a preferred technical scheme: the alloy comprises the following elements in percentage by weight: 0.15-0.25% of C, 0.30-0.60% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, less than or equal to 0.12% of Mo, 0.30-0.80% of Ni, 0.01-0.03% of Nb0.01, less than or equal to 0.30% of Cu, less than or equal to 0.015% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the contact for the high tower, which comprises the following steps:
step 1: casting: manufacturing a metal mold or a wood mold, machining the mold according to a drawing by using a numerical control machine tool, ensuring that the dimensional precision of the mold meets the requirement, ensuring that the mold does not deform and crack, selecting proper casting molding sand for casting, and selecting proper sand core molding sand for manufacturing a sand core for forming a casting inner cavity;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein waste steel is selected from large blocks which are consistent in material quality and have the size and the length of more than 200mm, or is selected from press-packed materials which are consistent in material quality, the pig iron is selected from pig iron for nodular cast iron with an execution standard GB/T1421, obvious rust, oil, water and other dirt and impurities do not exist on the surfaces of the waste steel and the pig iron, and casting is carried out after liquid steel is discharged;
and step 3: demolding: removing the mould, removing the molding sand, cutting a casting riser and polishing to be smooth;
and 4, step 4: welding repair: performing weld repair on the casting meeting the weld repair regulation in the step 2, wherein the preheating temperature before welding is 20-150 ℃, and the interlayer temperature is 350 +/-10 ℃;
and 5: and (3) heat treatment: normalizing the casting, heating to 980 ℃ of 900-;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; surface quality detection is performed by magnetic powder or penetration detection, and internal quality detection is performed by ultrasonic detection;
the yield strength of the joint is more than or equal to 300MPa, the tensile strength is 500-670 MPa, the impact energy is more than or equal to 34J (-40 ℃), and the elongation is more than or equal to 22%.
As a preferred technical scheme: the foundry sand in the step 1 is usually prepared by using alkali phenolic resin sand or sodium silicate sand.
As a preferred technical scheme: flanges are arranged on the connecting ends of all the connecting pipes and the two connecting ends of the base pipe seat.
As a preferred technical scheme: and (3) adopting sodium silicate sand as the sand core molding sand in the step (1).
As a preferred technical scheme: and 5, normalizing the casting in the step 5, wherein the cooling mode is air cooling or water cooling.
As a preferred technical scheme: the quenching liquid is sodium chloride aqueous solution.
As a preferred technical scheme: and 3, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame cutting, and removing the rest casting risers by adopting a carbon arc gouging.
The invention has the beneficial effects that: a joint for a high tower, compared with a conventional structure:
1) the base pipe seat is used as a starting point, a plurality of connecting pipes are arranged for connecting the steel pipes, so that the design requirement of the high-rise tower is met, the high-rise tower is built without welding the plurality of steel pipes, the axes of the first, second and third connecting pipes are coplanar to form a first plane, the axes of the fourth, fifth and sixth connecting pipes are coplanar to form a second plane, and the axes of the first, second, third, fourth, fifth, sixth, seventh and eighth connecting pipes are intersected at the central point of the base pipe seat to form a reasonable stress system, so that the support is more stable, and the connecting pipes are not easy to break;
2) preferably, the axis of the seventh connecting pipe is superposed with the angle bisector of the first plane and the second plane, so that the stress is more reasonable;
3) preferably, the second connecting pipe is perpendicular to the base pipe seat, the first connecting pipe, the second connecting pipe and the third connecting pipe form an included angle of 45 degrees with the axis of the second connecting pipe, the fifth connecting pipe is perpendicular to the base pipe seat, the included angle of 45 degrees with the axis of the fifth connecting pipe is formed by the axis of the fourth connecting pipe, the included angle of 45 degrees with the axis of the fifth connecting pipe is formed by the axis of the sixth connecting pipe, the included angle of 45 degrees with the axis of the fifth connecting pipe is formed, the axes are symmetrical to be uniformly stressed, and the support is more stable;
4) the yield strength and the tensile strength of the joint can be obviously enhanced and the corrosion resistance can be improved by matching the proportion of each element of the joint with the preparation method of the joint.
Drawings
FIG. 1 is a three-dimensional view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a top view of the present invention;
fig. 5 is a sectional view taken along line a-a of fig. 2.
In fig. 1-5, 1 is a base pipe seat, 2 is a connection cavity, 3 is a first connection pipe, 4 is a second connection pipe, 5 is a third connection pipe, 6 is a fourth connection pipe, 7 is a fifth connection pipe, 8 is a sixth connection pipe, 9 is a seventh connection pipe, 10 is an eighth connection pipe, and 11 is a flange.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", etc. indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, it is only for convenience of description of the present invention, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-5, a joint for a high tower includes a base pipe seat 1, a connecting cavity 2 is provided in two connecting ends of the base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4 and a third connecting pipe 5 are provided on the base pipe seat 1, and the axes of the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 are coplanar to form a first plane, a fourth connecting pipe 6, a fifth connecting pipe 7 and a sixth connecting pipe 8 are also provided on the base pipe seat 1, and the axes of the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 are coplanar to form a second plane, a seventh connecting pipe 9 is provided on the base pipe seat 1, and the seventh connecting pipe 9 is located between the first plane and the second plane, an eighth connecting pipe 10 opposite to the second connecting pipe 4 is provided on the base pipe seat 1, connecting cavities 2 are provided in the connecting ends of all the connecting pipes, the connecting cavities 2 can not only reduce the weight of the joint, the space for expansion and contraction can be reserved for the connecting end, excessive deformation of the connecting end after the connecting end is connected with a steel pipe is prevented, the connection is more reliable, the axes of all connecting pipes are intersected at the central point of the base pipe seat 1, a common casting is of an integral structure, the axes of the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1 to form a whole, the integrity is better, the central point is the most stable point of the connection point, the stress is dispersed outwards by taking the center as the starting point, so that the stress system is more reasonable, and the support is more stable; the included angle of first plane and second plane is 90 degrees 10, forms kind right angle atress system, further promotes the support stability, and further, the included angle of first plane and second plane is 90.
As shown in fig. 1-5, the second connecting pipe 4 is perpendicular to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 °, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 °, the fifth connecting pipe 7 is perpendicular to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 °, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 °, the axes are symmetrical to be uniformly stressed, a symmetrical stress system is formed, and the stability is further improved.
As shown in fig. 1 to 5, further, the intersections of the base tube seat 1, the first connecting tube 3, the second connecting tube 4, the third connecting tube 5, the fourth connecting tube 6, the fifth connecting tube 7, the sixth connecting tube 8, the seventh connecting tube 9, and the eighth connecting tube 10 are provided with rounded corners to prevent cracks from being generated.
As shown in fig. 1 to 5, further, the port of one connecting end of the base pipe seat 1 is provided with a groove for connecting steel pipes with different calibers.
As shown in fig. 1-5, the connection end is typically connected to the steel pipe by a flange 11, which is easy to install and remove.
The contact of the invention adopts materials which comprise the following elements in percentage by weight: 0.15-0.25% of C, 0.30-0.60% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, less than or equal to 0.12% of Mo, 0.30-0.80% of Ni, 0.01-0.03% of Nb0.01, less than or equal to 0.30% of Cu, less than or equal to 0.015% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurities.
Specifically, the action and specific gravity of each element of the contact of the present invention are as follows:
carbon (C): carbon is a strong austenite element, the tensile strength and the yield strength of the stainless steel can be improved along with the increase of the carbon content, but simultaneously the toughness of the stainless steel can be reduced, the elongation of the stainless steel is influenced, the corrosion resistance can be reduced, the carbon content exceeds 23%, the welding performance of the stainless steel can be reduced, and the weight percentage of the carbon in the invention is 0.15-0.25%.
Silicon (Si): the silicon can enable the stainless steel to have excellent high-temperature resistance, and meanwhile, a silicon-rich oxidation protection film can be formed on the surface of the stainless steel, so that the atmospheric corrosion resistance of the stainless steel is enhanced, but the plasticity of the stainless steel is reduced along with the increase of the content of the silicon, and the weight percentage of the silicon in the invention is 0.30-0.60%.
Manganese (Mn): when the stainless steel is cooled after quenching, the stability of austenite is improved, and the weldability of the stainless steel is improved to a certain extent, but the content of manganese cannot be too high, so that negative effects are generated on the stainless steel, for example, the precipitation of brittle phases such as sigma and the like can be promoted, the plasticity and toughness of the stainless steel are reduced, and the corrosion resistance of the stainless steel is also reduced, wherein the weight percentage of manganese is 1.00-1.60%.
Chromium (Cr): chromium is an essential element in stainless steel, can effectively improve the plasticity and impact toughness of the stainless steel, and has good corrosion resistance, and the weight percentage of chromium in the invention is 0.10-0.30%.
Molybdenum (Mo): the molybdenum can obviously improve the abrasion resistance and the wear resistance of the stainless steel, and the content of the molybdenum in the invention is not more than 0.12 percent.
Nickel (Ni): the nickel can promote the stability of the stainless steel passive film and improve the corrosion resistance, particularly the corrosion resistance to caustic substances and salt substances is excellent, such as NaOH, NaCl and the like, the coexistence of the nickel and chromium further strengthens the stainless steel rust resistance, and can improve the thermodynamic temperature property of the stainless steel, but the solubility of carbon can be reduced along with the increase of the nickel, and the weight percentage of the nickel in the invention is 0.30-0.80%.
Niobium (Nb): niobium can strengthen various mechanical properties of the stainless steel, can refine crystal grains, improve corrosion performance and improve creep property and impact toughness of the stainless steel, but the cost of the niobium is high, and the weight percentage of silicon in the invention is 0.01-0.03%.
Copper (Cu): the copper can improve the stainless steel rust resistance and corrosion resistance, particularly has more obvious effect in reducing media such as sulfuric acid and the like, but the strength of the stainless steel can be reduced by excessively high content, but the plasticity of the stainless steel can be improved, and the weight percentage of the copper in the invention is not more than 0.30%.
Phosphorus (P) and sulfur (S): phosphorus and sulfur are common harmful impurities, the content of the phosphorus and the sulfur is reduced as much as possible, and the weight percentage of the phosphorus and the sulfur is not more than 0.015 percent.
The preparation method of the contact comprises the following steps:
step 1: casting: manufacturing a metal mold or a wood mold, generally selecting a metal mold, processing the mold by using a numerical control machine according to a drawing, ensuring that the dimensional precision of the mold reaches or is superior to 10% of the dimensional tolerance of a casting, ensuring that the mold is not deformed and cracked, selecting proper foundry molding sand for casting, generally selecting alkali phenolic resin sand or sodium silicate sand as the foundry molding sand, wherein the alkali phenolic resin sand ensures that the surface quality of the casting is better, the sodium silicate sand ensures that the surface of the casting has smaller tendency of cracking, and selecting proper sand core molding sand to manufacture a sand core for forming an inner cavity of the casting, wherein the sand core molding sand generally adopts sodium silicate sand;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, wherein the smelting by using the alkaline electric arc furnace can effectively remove sulfur, phosphorus, carbon and gas and impurities in molten steel, the purity and various performances of cast steel can be improved to the maximum extent, the materials are fed according to the proportion, wherein the waste steel is made of large blocks which are consistent in material and have the size and the length of more than 200mm, or is press-packed materials which are consistent in material, the pig iron is made of pig iron for nodular cast iron with the execution standard GB/T1421, the surfaces of the waste steel and the pig iron have no obvious rust, oil, water and other dirt and impurities, the casting is carried out after the molten steel is discharged, the strict requirements on the materials in the links of furnace materials such as the waste steel, the pig iron and the like can ensure that the purity of a smelted cast ingot is higher, and all elements are more fully dissolved;
and step 3: demolding: removing the mould, removing the molding sand, cutting the casting riser and polishing smoothly, further cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame cutting, removing the rest casting risers by adopting carbon arc gouging, wherein the cutting of the casting riser at the position of less than 20mm above the upper part of the surface of the casting can influence the surface precision of the casting, and the precision of the carbon arc gouging is higher;
and 4, step 4: welding repair: the casting meeting the repair welding regulation in the step 2 is subjected to repair welding, the preheating temperature before welding is 20-150 ℃, and the interlayer temperature is 350 +/-10 ℃, so that the repair welding effect can be improved, the performance of the casting after repair welding is not affected, and the stress of the casting can be reduced in the temperature range;
and 5: and (3) heat treatment: and (3) heat treatment: normalizing the casting, heating to 980 ℃ of 900-;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; surface quality detection is performed by magnetic powder or penetration detection, and internal quality detection is performed by ultrasonic detection;
according to the proportion of each element in the joint and the preparation method thereof, the yield strength of the joint is more than or equal to 300MPa, the tensile strength is 500-670 MPa, the impact energy is more than or equal to 34J (-40 ℃), and the elongation is more than or equal to 22%.
Furthermore, the quenching liquid in the step 5 is a sodium chloride solution, and the sodium chloride can be attached to the surface of a scorching quenching part and burst to form a vaporific collapsing film, so that a steam film caused by high temperature is damaged, the cooling speed is obviously increased, the cooling is more uniform, and the casting hardness can be higher and more uniform.
Example 1
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 100 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the connecting points are made of materials which comprise the following elements in percentage by weight: 0.15% of C, 0.30% of Si, 1.00% of Mn1, 0.10% of Cr0.1%, 0.1% of Mo0, 0.3% of Ni0.01% of Nb0.20%, 0.015% of Cu0, 0.015% of P, 0.015% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a wood mould, machining the mould according to a drawing by using a numerical control machine tool, ensuring that the dimensional precision of the mould reaches 10% of the dimensional tolerance of a casting, ensuring that the mould is not deformed and cracked, selecting sodium silicate sand for casting, and selecting the sodium silicate sand for manufacturing a sand core for forming an inner cavity of the casting;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein waste steel is large blocks which are consistent in material and have the size and the length of more than 200mm, the pig iron is pig iron for ductile iron with an execution standard GB/T1421, obvious rust, oil, water and other dirt and impurities do not exist on the surfaces of the waste steel and the pig iron, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting a casting riser and polishing to be smooth;
and 4, step 4: welding repair: performing weld repair on the casting meeting the weld repair regulation in the step 2, wherein the preheating temperature before welding is 20 ℃, and the interlayer temperature is 340 ℃;
and 5: and (3) heat treatment: and (3) heat treatment: normalizing the casting, heating to 900 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a sodium chloride solution, heating to 920 ℃, and then tempering, the tempering temperature is 610 ℃, the temperature uniformity of a heat treatment furnace is detected during heat treatment, the furnace condition detection report of the furnace temperature uniformity of the heat treatment furnace meets the requirement of the standard GB/T9452, and the grade requirement is 3 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is performed by permeation detection, and the internal quality detection is performed by ultrasonic detection.
Example 2
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 100 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the connecting points are made of materials which comprise the following elements in percentage by weight: 0.15% of C, 0.40% of Si, 1.20% of Mn1, 0.20% of Cr0.20%, 0.1% of Mo0, 0.4% of Ni0.01% of Nb0.20%, 0.20% of Cu0, 0.015% of P, 0.015% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a metal mould, machining the mould according to a drawing by using a numerical control machine tool, so that the dimensional precision of the mould is superior to 10% of the dimensional tolerance of a casting, the mould is ensured not to deform and crack, sodium silicate sand is selected for casting, and the sand core for forming the inner cavity of the casting is manufactured by the sodium silicate sand;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein waste steel is large blocks which are consistent in material and have the size and the length of more than 200mm, the pig iron is pig iron for ductile iron with an execution standard GB/T1421, obvious rust, oil, water and other dirt and impurities do not exist on the surfaces of the waste steel and the pig iron, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting a casting riser and polishing to be smooth;
and 4, step 4: welding repair: performing weld repair on the casting meeting the weld repair regulation in the step 2, wherein the preheating temperature before welding is 20 ℃, and the interlayer temperature is 340 ℃;
and 5: and (3) heat treatment: and (3) heat treatment: normalizing the casting, heating to 900 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a sodium chloride solution, heating to 920 ℃, and then tempering, the tempering temperature is 610 ℃, the temperature uniformity of a heat treatment furnace is detected during heat treatment, the furnace condition detection report of the furnace temperature uniformity of the heat treatment furnace meets the requirement of the standard GB/T9452, and the grade requirement is 3 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is carried out by magnetic particle detection, and the internal quality detection is carried out by ultrasonic detection.
Example 3
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 90 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the connecting points are made of materials which comprise the following elements in percentage by weight: 0.20% of C, 0.4% of Si, 1.50% of Mn1, 0.2% of Cr0.12% of Mo0.12%, 0.7% of Ni0.03%, 0.20% of Cu0.010% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a metal mould, machining the mould according to a drawing by using a numerical control machine tool, so that the dimensional precision of the mould is superior to 10% of the dimensional tolerance of a casting, the mould is ensured not to deform and crack, sodium silicate sand is selected for casting, and the sand core for forming the inner cavity of the casting is manufactured by the sodium silicate sand;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein waste steel is large blocks which are consistent in material and have the size and the length of more than 200mm, the pig iron is pig iron for ductile iron with an execution standard GB/T1421, obvious rust, oil, water and other dirt and impurities do not exist on the surfaces of the waste steel and the pig iron, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame, and removing the rest casting risers by adopting a carbon arc gouging cutter;
and 4, step 4: welding repair: performing weld repair on the casting meeting the weld repair regulation in the step 2, wherein the preheating temperature before welding is 140 ℃, and the interlayer temperature is 350 ℃;
and 5: and (3) heat treatment: normalizing the casting, heating to 910 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a sodium chloride solution, heating to 930 ℃, and then tempering, the tempering temperature is 620 ℃, the temperature uniformity of a heat treatment furnace is detected during heat treatment, the furnace condition detection report of the furnace temperature uniformity of the heat treatment furnace meets the requirement of the standard GB/T9452, and the grade requirement is 2 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is performed by permeation detection, and the internal quality detection is performed by ultrasonic detection.
Example 4
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 90 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the connecting points are made of materials which comprise the following elements in percentage by weight: 0.20% of C, 0.5% of Si, 1.50% of Mn1, 0.3% of Cr0.12% of Mo0.12%, 0.8% of Ni0.03%, 0.20% of Cu0.010% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a metal mould, machining the mould according to a drawing by using a numerical control machine tool, so that the dimensional precision of the mould is superior to 10% of the dimensional tolerance of a casting, the mould is ensured not to deform and crack, sodium silicate sand is selected for casting, and the sand core for forming the inner cavity of the casting is manufactured by the sodium silicate sand;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein waste steel is large blocks which are consistent in material and have the size and the length of more than 200mm, the pig iron is pig iron for ductile iron with an execution standard GB/T1421, obvious rust, oil, water and other dirt and impurities do not exist on the surfaces of the waste steel and the pig iron, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame, and removing the rest casting risers by adopting a carbon arc gouging cutter;
and 4, step 4: welding repair: performing weld repair on the casting meeting the weld repair regulation in the step 2, wherein the preheating temperature before welding is 140 ℃, and the interlayer temperature is 350 ℃;
and 5: and (3) heat treatment: normalizing the casting, heating to 930 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a sodium chloride solution, heating to 940 ℃, and then tempering, the tempering temperature is 630 ℃, the uniformity of the furnace temperature of the heat treatment furnace is detected during heat treatment, the detection report of the furnace condition of the heat treatment furnace with the uniformity of the furnace temperature meets the requirement of the standard GB/T9452, and the grade requirement is 2 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is carried out by magnetic particle detection, and the internal quality detection is carried out by ultrasonic detection.
Example 5
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 80 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the cast steel joint adopts materials which comprise the following elements in percentage by weight: 0.23% of C, 0.5% of Si, 1.60% of Mn1, 0.20% of Cr0.12% of Mo0.12%, 0.7% of Ni0.02%, 0.30% of Cu0.010% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a wood die, machining the die according to a drawing by using a numerical control machine tool, so that the dimensional accuracy of the die is better than 10% of the dimensional tolerance of a casting, ensuring that the die is not deformed and cracked, selecting alkali phenolic resin sand for casting, and selecting water glass sand for manufacturing a sand core for forming an inner cavity of the casting;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein scrap steel is a press-packed material with consistent material quality, pig iron is pig iron for ductile iron with execution standard GB/T1421, the surfaces of the scrap steel and the pig iron have no obvious rust, oil, water and other dirt and impurities, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame, and removing the rest casting risers by adopting a carbon arc gouging cutter;
and 4, step 4: welding repair: welding repair is carried out on the casting meeting the welding repair regulation in the step 2, the preheating temperature before welding is 150 ℃, and the interlayer temperature is 360 ℃;
and 5: and (3) heat treatment: and (3) heat treatment: normalizing the casting, heating to 940 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a quenching liquid, heating to 950 ℃, and then tempering, the tempering temperature is 650 ℃, the uniformity of the furnace temperature of the heat treatment furnace is detected during heat treatment, the detection report of the furnace condition of the heat treatment furnace with the uniformity of the furnace temperature meets the requirement of the standard GB/T9452, and the grade requirement is 3 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is performed by permeation detection, and the internal quality detection is performed by ultrasonic detection.
Example 6
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 80 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the cast steel joint adopts materials which comprise the following elements in percentage by weight: 0.23% of C, 0.6% of Si, 1.60% of Mn1, 0.30% of Cr0.12%, 0.8% of Ni0.03%, 0.30% of Cu0.010%, 0.010% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a metal mould, machining the mould according to a drawing by using a numerical control machine tool, so that the dimensional precision of the mould is superior to 10% of the dimensional tolerance of a casting, the mould is ensured not to deform and crack, alkali phenolic resin sand is selected for casting, and sodium silicate sand is selected for manufacturing a sand core for forming an inner cavity of the casting;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein scrap steel is a press-packed material with consistent material quality, pig iron is pig iron for ductile iron with execution standard GB/T1421, the surfaces of the scrap steel and the pig iron have no obvious rust, oil, water and other dirt and impurities, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame, and removing the rest casting risers by adopting a carbon arc gouging cutter;
and 4, step 4: welding repair: welding repair is carried out on the casting meeting the welding repair regulation in the step 2, the preheating temperature before welding is 150 ℃, and the interlayer temperature is 360 ℃;
and 5: and (3) heat treatment: and (3) heat treatment: normalizing the casting, heating to 910 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a quenching liquid, heating to 920 ℃, and then tempering, the tempering temperature is 620 ℃, the uniformity of the furnace temperature of the heat treatment furnace is detected during heat treatment, the detection report of the furnace condition of the heat treatment furnace with the uniformity of the furnace temperature meets the requirement of the standard GB/T9452, and the grade requirement is 3 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is carried out by magnetic particle detection, and the internal quality detection is carried out by ultrasonic detection.
Example 7
A contact point for a towering tower comprises a base pipe seat 1, a first connecting pipe 3, a second connecting pipe 4, a third connecting pipe 5, a fourth connecting pipe 6, a fifth connecting pipe 7, a sixth connecting pipe 8, a seventh connecting pipe 9 and an eighth connecting pipe 10, wherein the first connecting pipe 3, the second connecting pipe 4 and the third connecting pipe 5 form a first plane, the fourth connecting pipe 6, the fifth connecting pipe 7 and the sixth connecting pipe 8 form a second plane, the included angle between the first plane and the second plane is 80 degrees, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the fifth connecting pipe 7, the sixth connecting pipe 8, the seventh connecting pipe 9 and the eighth connecting pipe 10 are intersected at the central point of the base pipe seat 1, the second connecting pipe 4 is vertical to the base pipe seat 1, the included angle between the axis of the first connecting pipe 3 and the axis of the second connecting pipe 4 is 45 degrees, the included angle between the axis of the third connecting pipe 5 and the axis of the second connecting pipe 4 is 45 degrees, the fifth connecting pipe 7 is vertical to the base pipe seat 1, the included angle between the axis of the fourth connecting pipe 6 and the axis of the fifth connecting pipe 7 is 45 degrees, the included angle between the axis of the sixth connecting pipe 8 and the axis of the fifth connecting pipe 7 is 45 degrees, and the cast steel joint adopts materials which comprise the following elements in percentage by weight: 0.23% of C, 0.6% of Si, 1.60% of Mn1, 0.30% of Cr0.12%, 0.8% of Ni0.03%, 0.30% of Cu0.010%, 0.010% of P, 0.010% of S, and the balance of Fe and inevitable impurities.
A preparation method of a joint for a high-rise tower comprises the following steps:
step 1: casting: manufacturing a metal mould, machining the mould according to a drawing by using a numerical control machine tool, so that the dimensional precision of the mould is superior to 10% of the dimensional tolerance of a casting, the mould is ensured not to deform and crack, alkali phenolic resin sand is selected for casting, and sodium silicate sand is selected for manufacturing a sand core for forming an inner cavity of the casting;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein scrap steel is a press-packed material with consistent material quality, pig iron is pig iron for ductile iron with execution standard GB/T1421, the surfaces of the scrap steel and the pig iron have no obvious rust, oil, water and other dirt and impurities, and casting is carried out after tapping liquid;
and step 3: demolding: removing the mould, removing the molding sand, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame, and removing the rest casting risers by adopting a carbon arc gouging cutter;
and 4, step 4: welding repair: welding repair is carried out on the casting meeting the welding repair regulation in the step 2, the preheating temperature before welding is 150 ℃, and the interlayer temperature is 360 ℃;
and 5: and (3) heat treatment: and (3) heat treatment: normalizing the casting, heating to 980 ℃, cooling, and then carrying out quenching and tempering, wherein the quenching and tempering comprises quenching and tempering, quenching is carried out in a quenching liquid, heating to 960 ℃, and then tempering, the tempering temperature is 660 ℃, the uniformity of the furnace temperature of the heat treatment furnace is detected during heat treatment, the detection report of the furnace condition of the heat treatment furnace with the uniformity of the furnace temperature meets the requirement of the standard GB/T9452, and the grade requirement is 2 grade;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; the surface quality detection is performed by permeation detection, and the internal quality detection is performed by ultrasonic detection.
The mechanical property tests of the steel castings of examples 1 to 7 should include the following: each heat treatment furnace is an inspection batch, an inspection test block is prepared according to the current national standard GB/11352 of cast carbon steel parts for general engineering, the inspection test block and the casting are subjected to heat treatment in the same furnace, and each inspection batch is required to take 2 tensile samples and 3 impact samples; the mechanical property test is carried out according to the part 1 of the metal material tensile test of the current national standard: the room temperature test method GB/T228.1 and the metallic material Charpy pendulum impact test method GB/T229 are carried out, and the detected yield strength, tensile strength, elongation and impact energy are shown in Table 1:
TABLE 1 mechanical Property test results of examples 1-7
As shown in Table 1, the room-temperature yield strength, the room-temperature tensile strength, the elongation and the impact energy (-40 ℃) of the embodiments 1 to 7 can well meet the design requirements of the joints for the high-rise tower, and compared with the traditional grade stainless steel, the mechanical properties of the embodiments 1 to 7 are better; according to the implementation 6 and 7, the same element proportion and the difference of the normalizing and tempering process seed temperature can also influence the room temperature mechanical property, and the normalizing and tempering temperature range is the range with better effect.
The foregoing examples are given solely for the purpose of illustrating the invention and are not to be construed as limiting the embodiments, and other variations and modifications in form thereof will be suggested to those skilled in the art upon reading the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments and all such obvious variations and modifications are deemed to be within the scope of the invention.
Claims (10)
1. A joint for a high tower comprises a base pipe seat (1), and is characterized in that: the connecting cavity (2) is arranged in two connecting ends of the base tube seat (1), the base tube seat (1) is provided with a first connecting tube (3), a second connecting tube (4) and a third connecting tube (5) which are communicated with each other, the axes of the first connecting tube (3), the second connecting tube (4) and the third connecting tube (5) are coplanar to form a first plane, the base tube seat (1) is further provided with a fourth connecting tube (6), a fifth connecting tube (7) and a sixth connecting tube (8) which are communicated with each other, the axes of the fourth connecting tube (6), the fifth connecting tube (7) and the sixth connecting tube (8) are coplanar to form a second plane, the included angle between the first plane and the second plane is 90 degrees +/-10 degrees, the base tube seat (1) is provided with a seventh connecting tube (9), the seventh connecting tube (9) is positioned between the first plane and the second plane, the base tube seat (1) is provided with an eighth connecting tube (10) which is opposite to the second connecting tube (4), the axes of all the connecting pipes are intersected at the central point of the base pipe seat (1), and connecting cavities (2) are arranged in the connecting ends of all the connecting pipes.
2. A joint for a high tower according to claim 1, wherein: the axis of the seventh connecting pipe (9) is coincident with the angle bisector of the first plane and the second plane.
3. A joint for a high tower according to claim 1, wherein: the second connecting pipe (4) is perpendicular to the base pipe seat (1), the axis of the first connecting pipe (3) and the axis included angle of the second connecting pipe (4) are 45 degrees, the axis of the third connecting pipe (5) and the axis included angle of the second connecting pipe (4) are 45 degrees, the fifth connecting pipe (7) is perpendicular to the base pipe seat (1), the axis of the fourth connecting pipe (6) and the axis included angle of the fifth connecting pipe (7) are 45 degrees, and the axis of the sixth connecting pipe (8) and the axis included angle of the fifth connecting pipe (7) are 45 degrees.
4. A joint for a high tower according to any one of claims 1 to 3, wherein: the alloy comprises the following elements in percentage by weight: 0.15-0.25% of C, 0.30-0.60% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, less than or equal to 0.12% of Mo, 0.30-0.80% of Ni, 0.01-0.03% of Nb0.01, less than or equal to 0.30% of Cu, less than or equal to 0.015% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurities.
5. The method for manufacturing a joint for a high-rise tower as claimed in claim 4, wherein: the method comprises the following steps:
step 1: casting: manufacturing a metal mold or a wood mold, machining the mold according to a drawing by using a numerical control machine tool, ensuring that the dimensional precision of the mold meets the requirement, ensuring that the mold does not deform and crack, selecting proper casting molding sand for casting, and selecting proper sand core molding sand for manufacturing a sand core for forming a casting inner cavity;
step 2: smelting and molding: smelting and deslagging by using an alkaline electric arc furnace, feeding according to a ratio, wherein waste steel is selected from large blocks which are consistent in material quality and have the size and the length of more than 200mm, or is selected from press-packed materials which are consistent in material quality, the pig iron is selected from pig iron for nodular cast iron with an execution standard GB/T1421, obvious rust, oil, water and other dirt and impurities do not exist on the surfaces of the waste steel and the pig iron, and casting is carried out after liquid steel is discharged;
and step 3: demolding: removing the mould, removing the molding sand, cutting a casting riser and polishing to be smooth;
and 4, step 4: welding repair: performing weld repair on the casting meeting the weld repair regulation in the step 2, wherein the preheating temperature before welding is 20-150 ℃, and the interlayer temperature is 350 +/-10 ℃;
and 5: and (3) heat treatment: normalizing the casting, heating to 980 ℃ of 900-;
step 6: and (3) detection: performing nondestructive testing on the castings after the step 5, performing nondestructive testing on the castings piece by piece and 100% of the area of the castings, wherein the surface roughness of the castings meets the quality grade requirement of the testing; surface quality detection is performed by magnetic powder or penetration detection, and internal quality detection is performed by ultrasonic detection;
the yield strength of the joint is more than or equal to 300MPa, the tensile strength is 500-670 MPa, the impact energy is more than or equal to 34J (-40 ℃), and the elongation is more than or equal to 22%.
6. The method for manufacturing a joint for a high-rise tower according to claim 5, wherein: the foundry sand in the step 1 is usually prepared by using alkali phenolic resin sand or sodium silicate sand.
7. The method for manufacturing a joint for a high-rise tower according to claim 5, wherein: and (3) adopting sodium silicate sand as the sand core molding sand in the step (1).
8. The method for manufacturing a joint for a high-rise tower according to claim 5, wherein: and after the casting is subjected to normalizing pretreatment in the step 5, the cooling mode is air cooling or water cooling.
9. The method for manufacturing a joint for a high-rise tower according to claim 5, wherein: the quenching liquid is sodium chloride aqueous solution.
10. The method for manufacturing a joint for a high-rise tower according to claim 5, wherein: and 3, cutting the casting riser at the position of more than 20mm above the upper part of the surface of the casting by adopting flame cutting, and removing the rest casting risers by adopting a carbon arc gouging.
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| CN114042873A (en) * | 2021-11-03 | 2022-02-15 | 上海艾诺特殊钢铸造有限公司 | Paper machine rotor casting process |
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