CN107699790A - Weather-proof seamless steel pipe steel grade and method of manufacturing seamless steel pipe - Google Patents
Weather-proof seamless steel pipe steel grade and method of manufacturing seamless steel pipe Download PDFInfo
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- CN107699790A CN107699790A CN201710853001.4A CN201710853001A CN107699790A CN 107699790 A CN107699790 A CN 107699790A CN 201710853001 A CN201710853001 A CN 201710853001A CN 107699790 A CN107699790 A CN 107699790A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052742 iron Inorganic materials 0.000 claims abstract description 26
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000009785 tube rolling Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910052786 argon Inorganic materials 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000013019 agitation Methods 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 13
- 239000011574 phosphorus Substances 0.000 claims description 13
- 238000009628 steelmaking Methods 0.000 claims description 12
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000010949 copper Substances 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 14
- 230000007797 corrosion Effects 0.000 description 14
- 239000011651 chromium Substances 0.000 description 12
- 239000011572 manganese Substances 0.000 description 10
- 239000010955 niobium Substances 0.000 description 9
- 239000010936 titanium Substances 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 4
- 229910000870 Weathering steel Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000010962 carbon steel Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000000686 essence Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910002588 FeOOH Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910003264 NiFe2O4 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000008261 resistance mechanism Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of steel grade of weather-proof seamless steel pipe, manufacture method is：Step 1 is made steel, and requires to add P iron, V iron, Cr iron, Ni and Cu iron according to weather-proof grade and grade of steel；VD or RH vacuum degassings, vacuum degassing high vacuum time are no less than 10 minutes；Ca processing after vacuum degassing, the weak mixing time of argon gas are no less than 2 minutes；Casting process uses end electromagnetic agitation；Step 2 tube rolling, grade of steel Q235NH Q415NH and Q265GNH Q355GNH, the condition of delivery are to roll state；Step 3 is heat-treated, and grade of steel Q460NH Q550NH, the condition of delivery is quenched and tempered state.Present invention has the advantages that：1) proportioning that each element is adjusted flexibly in different weather-proof and grade of steel requirements can be directed to；2) different grade of steels can use the different conditions of delivery.
Description
Technical field
The present invention relates to the seamless steel pipe manufacturing technology field of metallurgical industry, more particularly to a kind of weather-proof seamless steel pipe steel grade
And method of manufacturing seamless steel pipe.
Background technology
Weathering steel is the atmospheric corrosion resistance low-alloy steel between ordinary carbon steel and stainless steel, and it passes through in ordinary carbon steel
On the basis of add the corrosion-resistant element such as a small amount of copper, chromium, phosphorus, nickel, molybdenum, niobium, vanadium, titanium and form.In marine atmosphere and industrial atmosphere etc.
Weathering steel rate of corrosion is substantially less than carbon steel in environment, and its weather-resistant performance is 2~8 times of ordinary carbon steel, has cost
Increase less, increase infrastructure device requirements for life, without application, economize on resources and the characteristics of labour, fully demonstrate weathering steel
Superiority.At present, weather-proof product made from steel is mainly weather-resistant steel plate, and seamless steel pipe product is seldom, be mainly used in rail bridge, ship,
The fields such as boiler, building.
The content of the invention
The technical problems to be solved by the invention be to provide a kind of strength range is wide, impact flexibility is high, even tissue it is resistance to
Wait seamless steel pipe to apply in wider scope field, meet the needs of market pair.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of weather-proof seamless steel pipe steel grade, it is described
The weight proportion of steel grades is：C：0.04~0.12%, Si：0.10~0.40%, Mn：0.30~1.10%, P：0.001~
0.15%, S：≤ 0.020%, Cu：0.20~0.55%, Cr：0.30~1.25%, Ni：0.12~0.65%, V：0.02~
0.12%, Nb：≤ 0.06%, Ti：≤ 0.10%, Al：≤ 0.06%, Mo：≤ 0.30%, remaining is iron, and impurity element is micro.
A kind of manufacture method of weather-proof seamless steel pipe, comprises the following steps：Step 1, steel-making：Through electric furnace or converter, LF essences
Refining, VD or RH vacuum degassings, continuous casting, dispensing require to add P according to proportioning described in claim 1 according to weather-proof grade and grade of steel
Iron, V iron, Cr iron, Ni and Cu iron；VD or RH vacuum degassings, vacuum degassing high vacuum time are no less than 10 minutes；After vacuum degassing
Ca processing, the weak mixing time of argon gas are no less than 2 minutes；Casting process uses end electromagnetic agitation；
Step 2, tube rolling：Annular stove heat, perforation, tandem rolling, sizing, sawing, aligning, flaw detection, storage, grade of steel are
Q235NH-Q415NH and Q265GNH-Q355GNH, the condition of delivery are to roll state.
A kind of manufacture method of weather-proof seamless steel pipe, comprises the following steps：Step 1, steel-making：Through electric furnace or converter, LF essences
Refining, VD or RH vacuum degassings, continuous casting, dispensing require to add P according to proportioning described in claim 1 according to weather-proof grade and grade of steel
Iron, V iron, Cr iron, Ni and Cu iron；VD or RH vacuum degassings, vacuum degassing high vacuum time are no less than 10 minutes；After vacuum degassing
Ca processing, the weak mixing time of argon gas are no less than 2 minutes；Casting process uses end electromagnetic agitation；
Step 2, tube rolling：Annular stove heat, perforation, tandem rolling, sizing, sawing, aligning, flaw detection, storage；
Step 3, heat treatment：Tempering and Quenching, flaw detection, spray mark, storage, 890~950 DEG C of hardening heat, temperature
600~700 DEG C, grade of steel Q460NH-Q550NH, the condition of delivery is quenched and tempered state.
The finishing temperature control of state delivery steel pipe is rolled at 830~950 DEG C.
The step 1, high durable require that phosphorus content control is 0.07%~0.15% in steel, common weather-proof to require in steel
Phosphorus content is controlled 0.001~0.07%.
The beneficial effects of the invention are as follows：The present invention provide weather-proof seamless steel pipe steel grade be adapted to manufacture different weather-proof grades and
The seamless steel pipe of strength grade requirement, have strength range wide, impact flexibility is high, the characteristics of even tissue；Use with carbon manganese steel
Based on, addition P, Cu, Cr, Ni, V etc. steel grade design, different weather-proof and grade of steel requirements can be directed to each member is adjusted flexibly
The proportioning of element；Different grade of steels can use the different conditions of delivery, and grade of steel Q235NH-Q415NH and Q265GNH-Q355GNH are handed over
Goods state is quenched and tempered state to roll the state grade of steel Q460NH-Q550NH conditions of delivery.
Brief description of the drawings
Fig. 1 is Φ 273 × 12.7mm Q355GNH structural tube 100X metallographs；
Fig. 2 is Φ 355.6 × 12.7mm Q550NH structural tube 100X metallographs.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
The present invention is adapted to production grade of steel Q265GNH~Q355GNH, the weather-proof seamless steel pipes of Q235NH~Q550NH.
As shown in Figure 1 and Figure 2, a kind of steel grade of weather-proof seamless steel pipe, the weight proportion of steel grades are：C：0.04~
0.12%, Si：0.10~0.40%, Mn：0.30~1.10%, P：0.001~0.15%, S：≤ 0.020%, Cu：0.20~
0.55%, Cr：0.30~1.25%, Ni：0.12~0.65%, V：0.02~0.12%, Nb：≤ 0.06%, Ti：≤
0.10%, Al：≤ 0.06%, Mo：≤ 0.30%, remaining is iron, and impurity element is micro；The manufacture method of weather-proof seamless steel pipe,
Through the following steps that carry out：Steel-making, includes electric furnace or converter → LF refining → VD or RH vacuum degassings → continuous casting；Roll
Pipe, includes annular stove heat → perforation → tandem rolling → sizing → sawing → aligning → flaw detection → storage；It is heat-treated, at quenched heat
Reason → flaw detection → spray mark → storage, wherein：
1) dispensing is carried out according to the steel grades percentage by weight of above-mentioned weather-proof seamless steel pipe.
2) make steel：It is steelmaking feed by the weight proportion dispensing of the steel grades, according to weather-proof grade and grade of steel requirement
Different amounts of P iron, V iron, Cr iron, Ni and Cu, VD or RH vacuum degassings are added, vacuum degassing high vacuum time is no less than 10 points
Clock；Ca processing after vacuum degassing, the weak mixing time of argon gas are no less than 2 minutes；Casting process uses end electromagnetic agitation.
3) tube rolling：Controlled rolling technology is used for rolling state delivery steel pipe, it is ensured that finishing temperature control is at 830~950 DEG C.
4) it is heat-treated：Tempering and Quenching, 890~950 DEG C of hardening heat, 600~700 DEG C of temperature.
5) performance requirement of each grade of steel such as following table：
Require to adjust the proportioning for being capable of whole each element for different weather-proof and grade of steels, and different grade of steels use different delivery
State.High durable requires that phosphorus content control is 0.07%~0.15% in steel, common weather-proof to require that phosphorus content control exists in steel
0.001~0.07%.Grade of steel Q235NH-Q415NH and the Q265GNH-Q355GNH condition of delivery are to roll state grade of steel Q460NH-
The Q550NH conditions of delivery are quenched and tempered state.
It is as follows that reason is chosen to main constituents：
Carbon：Most economical in steel, most basic intensified element, by the effect of solution strengthening and precipitation strength to improving steel
Intensity has obvious effect, has the advantages of cost is low, regulation and control sensitiveness is good.In addition the strength matching relation of carbon and steel is also particularly
Important, because the height of phosphorus content and the intensity of steel are proportional, but the impact flexibility of steel and welding performance can then reduce.In order to
Intensity, toughness, weldability are taken into account, carbon content control between 0.04~0.12%.
Manganese：The stability of austenite is significantly improved, promotes bainite transformation, so as to significantly improve the intensity of steel, with reference to drop
Carbon is remarkably improved toughness and weldability.This steel grade controls manganese content between 0.30~1.10%.
Phosphorus：It is one of maximally effective alloy of atmospheric corrosion resistance for improving steel, usual P elements coordinate with copper, it
Can promote the uniform dissolution of steel, accelerate to accelerate Fe2+To Fe3+Conversion, make steel formed densification rusty scale.In weathering steel,
High durable requires that phosphorus content control is 0.07%~0.15% in steel, it is common it is weather-proof require in steel phosphorus content control 0.001~
0.07%, the two comprehensive requirement is by the content general control of phosphorus 0.001~0.15%, and when phosphorus content is too high, easily segregation is led
Uneven components are caused, causes mechanical performance to reduce and declines with welding performance.
Copper：It is maximally effective alloying element in atmospheric corrosion resistance low-alloy steel, suitable for various corrosive environments, for copper
Corrosion resistance mechanism, there are two kinds of viewpoints：A kind of viewpoint thinks that Cu can promote low-alloy steel anodic passivity, reduces corrosion rate；It is another
Kind of viewpoint thinks, Cu improves the protectiveness of rusty scale in rusty scale surface enrichment.Simultaneously as alloying element cu can generate difficulty with S
Molten sulfide, therefore copper can offset the illeffects of sulphur in steel.This steel grade copper content control 0.20~0.55% it
Between.
Chromium：It is the important element for improving resistance to atmosphere corrosion resisting, Cr plays a part of mainly having at 2 points：First, can make γ-
FeOOH, alpha-feooh convert to amorphous state, are formed and stabilize rusty scale；The member such as second, Cr and Cu, P, Si is known as good matching and made
With the steel corrosion resistance than single addition Cr is significantly improved.This steel grade controls chromium content between 0.30~1.25%.
Nickel：It is the effective element for improving steel atmospheric corrosion resistance, adding nickel can be such that the corrosion potential of steel changes to positive direction,
Mainly with NiFe2O4It is present in spinel oxides, promotes spinelle to relatively thin, compact texture transformation, add steel
Stability.This steel grade controls nickel content between 0.12~0.65%.
Vanadium：With higher precipitation strength effect and Grain Refinement Effect, pass through ferrite precipitation-hardening and refinement iron element
The raising surrender of body crystal grain and tensile strength.This steel grade controls content of vanadium between 0.02~0.12%.
Embodiment 1：Φ 114.3 × 8.56mm Q265GNH structured steel pipes
1.1 STEELMAKING PRODUCTION Φ 210mm round billet compositions：
| C | Si | Mn | P | S | Ni | Cr |
| 0.10 | 0.28 | 0.45 | 0.11 | 0.005 | 0.20 | 0.40 |
| Mo | Cu | Al | V | Nb | Ti | |
| 0.02 | 0.35 | 0.032 | 0.03 | 0.01 | 0.002 |
1.2 tube rolling
Rolled in 168PQF units, finishing temperature control is 850 DEG C.State delivery is rolled, final products the performance test results are such as
Under：
(1) stretch
| Test piece number (Test pc No.) | Temperature | Orientation | ReL(MPa) | Rm(MPa) | A% |
| 1 | 22 | Longitudinal direction | 304 | 447 | 35 |
(2) impact
(3) tissue：F+P
Embodiment 2：Φ273×12.7mm Q355GNH
2.1 STEELMAKING PRODUCTION Φ 310mm round billet compositions：
| C | Si | Mn | P | S | Ni | Cr |
| 0.11 | 0.32 | 0.88 | 0.12 | 0.007 | 0.40 | 0.95 |
| Mo | Cu | Al | V | Nb | Ti | |
| 0.01 | 0.45 | 0.034 | 0.09 | 0.01 | 0.002 |
2.2 tube rolling
Rolled in 250MPM units, finishing temperature control is 880 DEG C.State delivery is rolled, final products the performance test results are such as
Under：
(1) stretch
| Test piece number (Test pc No.) | Temperature | Orientation | ReL(MPa) | Rm(MPa) | A% |
| 1 | 22 | Longitudinal direction | 392 | 563 | 29 |
(2) impact
(3) tissue：F+P
Embodiment 3：Φ323×15.88mm Q235NH
3.1 STEELMAKING PRODUCTION Φ 350mm round billet compositions：
| C | Si | Mn | P | S | Ni | Cr |
| 0.09 | 0.35 | 0.55 | 0.023 | 0.006 | 0.18 | 0.45 |
| Mo | Cu | Al | V | Nb | Ti | |
| 0.02 | 0.26 | 0.032 | 0.04 | 0.01 | 0.002 |
3.2 tube rolling
Rolled in 460PQF units, finishing temperature control is 890 DEG C.State delivery is rolled, final products the performance test results are such as
Under：
(1) stretch
| Test piece number (Test pc No.) | Temperature | Orientation | ReL(MPa) | Rm(MPa) | A% |
| 1 | 22 | Longitudinal direction | 281 | 415 | 36 |
(2) impact
(3) tissue：F+P
Embodiment 4：Φ 406.4 × 9.53mm Q415NH structured steel pipes
4.1 STEELMAKING PRODUCTION Φ 400mm round billet compositions：
| C | Si | Mn | P | S | Ni | Cr |
| 0.12 | 0.35 | 1.06 | 0.028 | 0.007 | 0.50 | 0.89 |
| Mo | Cu | Al | V | Nb | Ti | |
| 0.02 | 0.48 | 0.032 | 0.10 | 0.01 | 0.002 |
4.2 tube rolling
Rolled in 460PQF units, finishing temperature control is 870 DEG C.State delivery is rolled, final products the performance test results are such as
Under：
(1) stretch
| Test piece number (Test pc No.) | Temperature | Orientation | ReL(MPa) | Rm(MPa) | A% |
| 1 | 22 | Longitudinal direction | 457 | 618 | 26 |
(2) impact
(3) tissue：F+P
Embodiment 5：Φ 219.1 × 18.26mm Q460NH structured steel pipes
5.1 STEELMAKING PRODUCTION Φ 270mm round billet compositions：
| C | Si | Mn | P | S | Ni | Cr |
| 0.08 | 0.27 | 0.86 | 0.025 | 0.009 | 0.28 | 0.41 |
| Mo | Cu | Al | V | Nb | Ti | |
| 0.02 | 0.32 | 0.032 | 0.05 | 0.01 | 0.002 |
5.2 tube rolling
Rolled in 258PQF units, finishing temperature control is 910 DEG C.
5.3 heat treatment
Using quenching-and-tempering process, hardening heat is 940 DEG C, water cooling, 670 DEG C of temperature, air cooling, final products
Energy test result is as follows：
(1) stretch
| Test piece number (Test pc No.) | Temperature | Orientation | ReL(MPa) | Rm(MPa) | A% |
| 1 | 22 | Longitudinal direction | 516 | 608 | 25 |
(2) impact
(3) tissue：SReturn+BReturn+F
Embodiment 6：Φ355.6×12.7mm Q550NH
6.1 STEELMAKING PRODUCTION Φ 350mm round billet compositions：
| C | Si | Mn | P | S | Ni | Cr |
| 0.11 | 0.31 | 0.95 | 0.025 | 0.009 | 0.45 | 0.56 |
| Mo | Cu | Al | V | Nb | Ti | |
| 0.02 | 0.41 | 0.029 | 0.10 | 0.01 | 0.002 |
6.2 tube rolling
Rolled in 460PQF units, finishing temperature control is 900 DEG C.
6.3 heat treatment
Using quenching-and-tempering process, hardening heat is 930 DEG C, water cooling, 640 DEG C of temperature, air cooling, final products
Energy test result is as follows：
(1) stretch
| Test piece number (Test pc No.) | Temperature | Orientation | ReL(MPa) | Rm(MPa) | A% |
| 1 | 22 | Longitudinal direction | 621 | 695 | 24 |
(2) impact
(3) tissue：SReturn+BReturn+F
Embodiment 7：Q355GNH, Q345B, X52Q salt fog contrast test
Salt fog contrast test is carried out to Q355GNH, Q345B, X52Q similar in yield strength, the intensity of three trades mark is as follows
Table：
240 hours salt spray corrosion tests are carried out, measuring Q355GNH, Q345B, X52Q corrosion rate average value is respectively
0.6968th, 0.9503,0.8497mm/y, the weather-proof seamless steel pipe of Q355GNH of the invention have very strong corrosion resistance.
Claims (5)
1. a kind of weather-proof seamless steel pipe steel grade, it is characterized in that：The weight proportion of the steel grades is：C：0.04~0.12%,
Si：0.10~0.40%, Mn：0.30~1.10%, P：0.001~0.15%, S：≤ 0.020%, Cu：0.20~0.55%,
Cr：0.30~1.25%, Ni：0.12~0.65%, V：0.02~0.12%, Nb：≤ 0.06%, Ti：≤ 0.10%, Al：≤
0.06%, Mo：≤ 0.30%, remaining is iron, and impurity element is micro.
2. the manufacture method of a kind of weather-proof seamless steel pipe of steel grade according to claim 1, comprises the following steps：
Step 1, steel-making：Through electric furnace or converter, LF refining, VD or RH vacuum degassings, continuous casting, dispensing is according to described in claim 1
Proportioning, require to add P iron, V iron, Cr iron, Ni and Cu iron according to weather-proof grade and grade of steel；VD or RH vacuum degassings, vacuum degassing
High vacuum time is no less than 10 minutes；Ca processing after vacuum degassing, the weak mixing time of argon gas are no less than 2 minutes；Casting process makes
With end electromagnetic agitation；
Step 2, tube rolling：Annular stove heat, perforation, tandem rolling, sizing, sawing, aligning, flaw detection, storage, grade of steel Q235NH-
Q415NH and Q265GNH-Q355GNH, the condition of delivery are to roll state.
3. the manufacture method of a kind of weather-proof seamless steel pipe of steel grade according to claim 1, comprises the following steps：Step 1,
Steel-making：Through electric furnace or converter, LF refining, VD or RH vacuum degassings, continuous casting, dispensing is according to proportioning described in claim 1, according to resistance to
Wait grade and grade of steel requires to add P iron, V iron, Cr iron, Ni and Cu iron；VD or RH vacuum degassings, vacuum degassing high vacuum time is not
Less than 10 minutes；Ca processing after vacuum degassing, the weak mixing time of argon gas are no less than 2 minutes；Casting process is stirred using end electromagnetism
Mix；
Step 2, tube rolling：Annular stove heat, perforation, tandem rolling, sizing, sawing, aligning, flaw detection, storage；
Step 3, heat treatment：Tempering and Quenching, flaw detection, spray mark, storage, 890~950 DEG C of hardening heat, temperature 600~
700 DEG C, grade of steel Q460NH-Q550NH, the condition of delivery is quenched and tempered state.
4. a kind of manufacture method of weather-proof seamless steel pipe according to claim 2, it is characterized in that：Roll the end of state delivery steel pipe
Temperature control is rolled at 830~950 DEG C.
5. a kind of manufacture method of weather-proof seamless steel pipe according to Claims 2 or 3, it is characterized in that：The step 1 is high
It is weather-proof to require in steel phosphorus content control 0.07%~0.15%, it is common it is weather-proof require in steel phosphorus content control 0.001~
0.07%.
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|---|---|---|---|
| CN201710853001.4A CN107699790A (en) | 2017-09-20 | 2017-09-20 | Weather-proof seamless steel pipe steel grade and method of manufacturing seamless steel pipe |
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| CN108913996A (en) * | 2018-07-12 | 2018-11-30 | 首钢集团有限公司 | A kind of steel house weather-proof H profile steel and preparation method thereof |
| CN109930064A (en) * | 2019-03-11 | 2019-06-25 | 江苏利淮钢铁有限公司 | A kind of effective heat resisting steel of corrosion-resistant high-pressure boiler and its production method |
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| CN109930064A (en) * | 2019-03-11 | 2019-06-25 | 江苏利淮钢铁有限公司 | A kind of effective heat resisting steel of corrosion-resistant high-pressure boiler and its production method |
| CN113574195A (en) * | 2019-03-12 | 2021-10-29 | 国立大学法人大阪大学 | Weather-resistant steel for solid-phase bonding, weather-resistant steel for solid-phase bonding, solid-phase bonding structure, and solid-phase bonding method |
| CN110157985B (en) * | 2019-05-31 | 2021-09-21 | 张家港华程机车精密制管有限公司 | Steel plate for chord web arm of crawler crane and thermal hardening and tempering process performed on steel plate |
| CN110157985A (en) * | 2019-05-31 | 2019-08-23 | 张家港华程机车精密制管有限公司 | Steel plate for crawler crane string abdomen arm and hot hardening and tempering process that it is carried out |
| CN110499466A (en) * | 2019-09-02 | 2019-11-26 | 河钢股份有限公司 | Yield strength 550MPa grade nickel-saving type high-strength weathering steel and its production method |
| CN111719082A (en) * | 2020-05-06 | 2020-09-29 | 唐山不锈钢有限责任公司 | Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof |
| CN114293099A (en) * | 2021-12-03 | 2022-04-08 | 石横特钢集团有限公司 | High-toughness weather-resistant section steel and production process method thereof |
| CN114717476A (en) * | 2022-03-11 | 2022-07-08 | 天津钢管制造有限公司 | Method for improving performance of rolled carbon steel seamless steel tube |
| CN114717476B (en) * | 2022-03-11 | 2023-11-21 | 天津钢管制造有限公司 | Method for improving performance of rolled carbon steel seamless steel tube |
| CN116855849A (en) * | 2023-07-18 | 2023-10-10 | 天津钢管制造有限公司 | Weather-proof seamless steel tube and preparation method thereof |
| CN116987954A (en) * | 2023-08-09 | 2023-11-03 | 常熟市龙腾特种钢有限公司 | High-strength and high-toughness flat-bulb steel and preparation method thereof |
| CN116987954B (en) * | 2023-08-09 | 2024-02-06 | 常熟市龙腾特种钢有限公司 | A kind of high strength and toughness spherical flat steel and its preparation method |
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Effective date of registration: 20190628 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Applicant after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Applicant before: Tianjin Steel Pipe Group Co., Ltd. |
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Application publication date: 20180216 |