CN110714172A - Large-size building round steel with good longitudinal and transverse impact toughness and production method thereof - Google Patents
Large-size building round steel with good longitudinal and transverse impact toughness and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
- 239000010959 steel Substances 0.000 title claims abstract description 128
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 88
- 238000007670 refining Methods 0.000 claims abstract description 74
- 238000005096 rolling process Methods 0.000 claims abstract description 57
- 238000009749 continuous casting Methods 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 239000000126 substance Substances 0.000 claims abstract description 31
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 13
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 8
- 238000009849 vacuum degassing Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 26
- 238000007872 degassing Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 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
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- 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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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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Abstract
The invention discloses a large-size round steel for buildings with good longitudinal and transverse impact toughness and a production method thereof, wherein the round steel comprises the following chemical components in percentage by mass: c: 0.17 to 0.22%, Si: 0.25 to 0.45%, Mn: 1.00-1.40%, Cr is less than or equal to 0.30%, V: 0.02 to 0.15%, Ti: 0.01-0.03%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Ni is less than or equal to 0.30%, Cu is less than or equal to 0.30%, Al: 0.010-0.040%, N: 0.007-0.012%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling. The product has vertical and horizontal V-shaped impact energy KV2 of more than or equal to 60J at normal temperature, yield strength Rel: 370-435 MPa, tensile strength Rm: 545-620 MPa.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to large-specification building round steel with good longitudinal and transverse impact toughness and a production method thereof.
Background
With the continuous expansion of urban scale, a serious situation of urban land shortage appears, and in order to effectively relieve the situation, super high-rise buildings become a main mode for urban construction and development. The urbanization quality is greatly improved at present, the life quality of people is also gradually improved, and the building engineering plays a greater and greater role. Compared with the low-rise building, the super high-rise building has higher requirements on safety and stability, and meanwhile, people put higher requirements on quality and safety of building engineering. Therefore, higher and higher requirements are also put on the constructional steel.
The construction steel is developing in the direction of high strength, high performance and large scale. The steel for modern buildings has the characteristics of high strength, light dead weight, good integral rigidity and strong deformability, so the steel is particularly suitable for building large-span, ultrahigh and overweight buildings; the material has good homogeneity and isotropy, and conforms to the basic assumption of general engineering mechanics; the material has good plasticity and toughness, can have larger deformation, and can well bear dynamic load.
Some modern steel for construction has strict requirements on certain indexes of steel, for example, the requirement on the homogeneity of various items of steel is strict, the longitudinal and transverse impact energy is required to be more than or equal to 60J, and the conventional requirement that the longitudinal KV2 is more than or equal to 27J cannot meet the use requirement and the safety requirement. Therefore, the large-specification building round steel with good longitudinal and transverse impact toughness is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the large-specification round steel for the building, which has good longitudinal and transverse impact toughness; the invention also provides a production method of the large-specification round steel for the building with good longitudinal and transverse impact toughness. According to the chemical composition design, V, Al and N elements are added to form nitride particles, a production process of converter, LF, VD, continuous casting and rolling is adopted, the longitudinal and transverse V-shaped impact energy KV2 of a product in a rolling state at normal temperature is more than or equal to 60J, and the yield strength Rel: 370-435 MPa, tensile strength Rm: 545-620 MPa, and stable performance.
In order to solve the technical problems, the invention adopts the technical scheme that: the round steel for the large-size building with good longitudinal and transverse impact toughness comprises the following chemical components in percentage by mass: c: 0.17 to 0.22%, Si: 0.25 to 0.45%, Mn: 1.00-1.40%, Cr is less than or equal to 0.30%, V: 0.02 to 0.15%, Ti: 0.01-0.03%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Ni is less than or equal to 0.30%, Cu is less than or equal to 0.30%, Al: 0.010-0.040%, N: 0.0070-0.0120% of Fe and the balance of inevitable impurities.
The action mechanism of each chemical component in the steel is as follows:
c: the main elements for improving the hardness and the strength of the steel are low in C content, and the strength of the material after heat treatment is too low to meet the strength requirement of the round steel for buildings; too high C content is easy to reduce the plasticity and toughness of the material.
Si: the strength of solid solution in steel is improved, the toughness and plasticity of the steel are reduced, and the low strength is not enough; too high causes the ferrite matrix to become brittle and the toughness to decrease.
Mn: in a certain range, Mn can improve the toughness of steel and reduce the brittleness; mn has a remarkable effect of improving the strength of low-carbon and medium-carbon steel and improving the hardenability of the steel; but when the Mn content is higher, the tempering brittleness phenomenon is more obvious, and the function of promoting the growth of crystal grains is realized.
Cr: the strength and the hardness of the steel can be improved, and the hardenability is improved; however, if the Cr content is too high, bainite is easily formed, and the low-temperature impact toughness of the steel is greatly reduced.
N: the most economic and effective alloying elements can form nitrides by combining with V, Ti and Al, and play a role in strengthening precipitation and refining grains; however, when the content of N is too high, more AlN is easily generated, the crack sensitivity of a continuous casting billet is increased, and meanwhile, the content and the size of TiN inclusions in steel are increased, and the toughness of the steel is damaged.
V: not only can improve the strength of the steel and reduce the overheating tendency, but also has obvious influence on the impact toughness of the steel. It reacts with nitrogen in the steel to form compounds and precipitates at grain boundaries, thereby playing a role in refining grains.
Ti: by reasonably controlling the existing form and the forming rule of titanium in steel, the titanium can play a role in refining grains, improving strength, improving toughness and the like. It reacts with nitrogen in the steel to form compounds and precipitates at grain boundaries, thereby playing a role in refining grains. Titanium in a certain range can improve impact toughness, but if the content is too high, the impact toughness of the steel is seriously deteriorated.
Al: is a strong deoxidizing element and plays a role in refining grains. Al and N are combined to refine grains, so that the toughness is improved; when the Al content in the steel is more than 0.50 percent, the effect of the Al on the toughness of the steel is not obviously influenced. Meanwhile, the high Al content easily causes the poor fluidity during continuous casting, and easily causes production accidents such as nozzle nodulation and the like.
S: has harmful effect on the plasticity and the toughness of the steel. Too high control of the S content may degrade the cleanliness of the steel and deteriorate the properties of the steel, particularly anisotropy.
P: increasing the brittleness of the steel and reducing the impact property, so that the content of the P element is controlled in a lower range, and the impact toughness of the steel can be prevented from being reduced.
The round steel for the building has the specification of phi 130-150 mm.
The yield strength Rel of the round steel for the building is as follows: 370-435 MPa, tensile strength Rm: 545-620 MPa, and the vertical and horizontal V-shaped impact energy KV2 at normal temperature is more than or equal to 60J.
The invention also provides a production method of the large-size round steel for the building with good longitudinal and transverse impact toughness, which comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling; in the LF refining process, 1.5-2.5 kg of ferrovanadium and 0.5-1.5 kg of ferrotitanium are added per ton of steel in the later period of LF refining; in the VD vacuum treatment process, 2.5-4.5 kg of MnN wires and 0.5-1.5 kg of aluminum wires are fed per t of steel after VD vacuum degassing treatment.
In the LF refining process, refining slag with high alkalinity R of 5-8 is adopted for refining, and S in steel is controlled: 0.002-0.010%.
In the continuous casting process, the chemical components and the mass percentage of the ladle sample in the continuous casting are as follows: c: 0.17 to 0.22%, Si: 0.25 to 0.45%, Mn: 1.00-1.40%, Cr is less than or equal to 0.30%, V: 0.02 to 0.15%, Ti: 0.01-0.03%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Ni is less than or equal to 0.30%, Cu is less than or equal to 0.30%, Al: 0.010-0.040%, N: 0.0070-0.0120% of Fe and the balance of inevitable impurities.
In the heating process, the billet is heated to 1140-1200 ℃ and is kept warm for 0.8-1.1 h. In order to prevent austenite grains from growing excessively, the heating temperature and the heat preservation time are strictly controlled in the heating process of the steel billet.
In the rolling process, the initial rolling temperature is 1050-1120 ℃, and the final rolling temperature is 880-950 ℃.
The standard of the round steel product for large-specification buildings refers to ASTM A572/A572M-07; the performance detection method is referred to GB/T228.1-2010 and GB/T229-2007.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the chemical composition design of the invention forms nitride particles by adding V, Al and N elements, plays a role in refining crystal grains, not only improves the impact toughness of steel, but also improves the strength of the steel, reduces the P, S content in the steel and improves the isotropy of the steel. 2. The invention adopts the production process of converter, LF, VD, continuous casting and rolling, and the production process is simple and convenient. 3. The longitudinal and transverse V-shaped impact energy KV2 of the product in a rolling state at normal temperature is more than or equal to 60J, and the yield strength Rel: 370-435 MPa, tensile strength Rm: 545-620 MPa, and stable performance.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 150mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 5, and controlling S: 0.010%; 1.7 kg of ferrovanadium is added at the later stage of refining per ton of steel, and 0.5 kg of ferrotitanium per ton of steel;
(2) VD vacuum treatment process: feeding 0.5 kg of aluminum wires and 4.5 kg of MnN wires per t of steel after the VD is degassed;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1140 ℃, and preserving heat for 0.8 h;
(5) a rolling procedure: the initial rolling temperature is 1050 ℃, and the final rolling temperature is 880 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 2
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 140mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 7, and controlling S in steel: 0.005 percent; 1.5 kg of ferrovanadium and 1.0 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: feeding 1.1 kg of aluminum wires and 2.5 kg of MnN wires per t of steel after the VD is degassed;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1190 ℃, and preserving heat for 1.1 h;
(5) a rolling procedure: the initial rolling temperature is 1120 ℃, and the final rolling temperature is 950 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 3
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is 130mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 7.5, and controlling S in steel: 0.004%; 1.6 kg of ferrovanadium and 0.8 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: after VD degassing, 0.9 kg of aluminum wire and 3.0 kg of MnN wire are fed into the steel wire per t;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1180 ℃, and keeping the temperature for 0.9 h;
(5) a rolling procedure: the initial rolling temperature is 1100 ℃, and the final rolling temperature is 930 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 4
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is 130mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 8, and controlling S in steel: 0.002%; 2.0 kg of ferrovanadium and 1.0 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: after VD degassing, 0.9 kg of aluminum wire and 3.5 kg of MnN wire are fed in per t of steel;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1170 ℃, and preserving heat for 0.9 h;
(5) a rolling procedure: the initial rolling temperature is 1080 ℃ and the final rolling temperature is 910 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 5
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 145mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 7, and controlling S in steel: 0.004%; 2.0 kg of ferrovanadium and 0.9 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: feeding 1.5 kg of aluminum wires and 4.5 kg of MnN wires per t of steel after the VD is degassed;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1190 ℃, and preserving heat for 0.9 h;
(5) a rolling procedure: the initial rolling temperature is 1095 ℃, and the final rolling temperature is 940 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 6
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 145mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 6, and controlling S in steel: 0.005 percent; 2.1 kg of ferrovanadium and 0.8 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: 1.1 kg of aluminum wires and 3.7 kg of MnN wires are fed into the VD after degassing;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1200 ℃, and preserving heat for 1.0 h;
(5) a rolling procedure: the initial rolling temperature is 1100 ℃, and the final rolling temperature is 940 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 7
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 150mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 7, and controlling S in steel: 0.004%; 1.9 kg of ferrovanadium and 1.5 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: 1.0 kg of aluminum wires and 3.0 kg of MnN wires are fed into the VD after degassing;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1190 ℃, and preserving heat for 1 h;
(5) a rolling procedure: the initial rolling temperature is 1100 ℃, and the final rolling temperature is 940 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 8
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 145mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 7.5, and controlling S in steel: 0.004%; 1.5 kg of ferrovanadium and 1.2 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: after VD degassing, 0.8 kg of aluminum wire and 3.0 kg of MnN wire are fed into the steel wire per t;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the ladle sample in continuous casting are shown in the table 1;
(4) a heating procedure: heating the steel billet to 1160 ℃, and preserving heat for 0.8 h;
(5) a rolling procedure: the initial rolling temperature is 1050 ℃, and the final rolling temperature is 880 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 9
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 135mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 6.5, and controlling S in steel: 0.005 percent; 2.0 kg of ferrovanadium and 1.1 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: after VD degassing, feeding 0.7 kg of aluminum wire per t of steel and 4.0 kg of MnN wire per t of steel;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1170 ℃, and preserving heat for 0.8 h;
(5) a rolling procedure: the initial rolling temperature is 1060 ℃, and the final rolling temperature is 890 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 10
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 135mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 7.5, and controlling S in steel: 0.003%; 2.5 kg of ferrovanadium and 1.3 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: 1.0 kg of aluminum wires and 4.0 kg of MnN wires are fed into the VD after degassing;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1160 ℃, and preserving heat for 1.1 h;
(5) a rolling procedure: the initial rolling temperature is 1070 ℃ and the final rolling temperature is 900 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Example 11
The specification of the large-specification building round steel with good longitudinal and transverse impact toughness is phi 135mm, and the chemical component composition and the mass percentage content are shown in table 1.
The production method of the large-size building round steel with good longitudinal and transverse impact toughness comprises the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling, and comprises the following specific process steps:
(1) an LF refining procedure: refining by using refining slag with high alkalinity R of 5.5, and controlling S: 0.008 percent; 2.2 kg of ferrovanadium and 1.4 kg of ferrotitanium are added in the later period of refining;
(2) VD vacuum treatment process: feeding 1.5 kg of aluminum wires and 4.4 kg of MnN wires per t of steel after the VD is degassed;
(3) and (3) continuous casting process: the chemical composition and the mass percentage of the continuous casting tundish sample are shown in a table 1;
(4) a heating procedure: heating the steel billet to 1170 ℃, and preserving heat for 1.0 h;
(5) a rolling procedure: the initial rolling temperature is 1080 ℃ and the final rolling temperature is 890 ℃.
The performance of the large-specification building round steel with good longitudinal and transverse impact toughness of the embodiment is shown in table 2.
Table 1 examples 1-11 chemical composition and mass% of round steel for construction
In table 1, the balance of the composition is Fe and inevitable impurities.
TABLE 2 Performance indices of round steels for construction of examples 1 to 11
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. The round steel for the large-size building with good longitudinal and transverse impact toughness is characterized by comprising the following chemical components in percentage by mass: c: 0.17 to 0.22%, Si: 0.25 to 0.45%, Mn: 1.00-1.40%, Cr is less than or equal to 0.30%, V: 0.02 to 0.15%, Ti: 0.01-0.03%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Ni is less than or equal to 0.30%, Cu is less than or equal to 0.30%, Al: 0.010-0.040%, N: 0.0070-0.0120% of Fe and the balance of inevitable impurities.
2. The large-size building round steel with good longitudinal and transverse impact toughness as claimed in claim 1, wherein the building round steel has a specification of 130-150 mm.
3. A large-size construction round bar with good longitudinal and transverse impact toughness as claimed in claim 1, wherein the yield strength Rel: 370-435 MPa, tensile strength Rm: 545-620 MPa, and the vertical and horizontal V-shaped impact energy KV2 at normal temperature is more than or equal to 60J.
4. The production method of the large-specification round steel for buildings with good longitudinal and transverse impact toughness is characterized by comprising the working procedures of smelting, LF refining, VD vacuum treatment, continuous casting, heating and rolling; in the LF refining process, 1.5-2.5 kg of ferrovanadium and 0.5-1.5 kg of ferrotitanium are added per ton of steel in the later period of LF refining; in the VD vacuum treatment process, 2.5-4.5 kg of MnN wires and 0.5-1.5 kg of aluminum wires are fed per t of steel after VD vacuum degassing treatment.
5. The method for producing the large-size round steel for buildings with good longitudinal and transverse impact toughness as claimed in claim 4, wherein in the LF refining process, refining slag with high alkalinity R of 5-8 is adopted for refining, and S: 0.002-0.010%.
6. The production method of the large-specification round steel for construction with good longitudinal and transverse impact toughness as claimed in claim 4, wherein the continuous casting process comprises the following chemical components in percentage by mass: c: 0.17 to 0.22%, Si: 0.25 to 0.45%, Mn: 1.00-1.40%, Cr is less than or equal to 0.30%, V: 0.02 to 0.15%, Ti: 0.01-0.03%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Ni is less than or equal to 0.30%, Cu is less than or equal to 0.30%, Al: 0.010-0.040%, N: 0.0070-0.0120% of Fe and the balance of inevitable impurities.
7. The method for producing large-sized round steel for building use according to any one of claims 4 to 6, wherein the heating step comprises heating the billet to 1140 to 1200 ℃ and maintaining the temperature for 0.8 to 1.1 hours.
8. The method for producing the large-sized round steel for construction use as claimed in any one of claims 4 to 6, wherein the rolling step is performed at a start rolling temperature of 1050 to 1120 ℃ and a finish rolling temperature of 880 to 950 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455276A (en) * | 2020-04-24 | 2020-07-28 | 石钢京诚装备技术有限公司 | Large-size hot-rolled round steel with good low-temperature impact toughness and production method thereof |
| CN112746221A (en) * | 2020-12-25 | 2021-05-04 | 钢铁研究总院 | V-N microalloyed 550MPa hot-rolled thick-wall H-shaped steel and production process thereof |
| CN114892079A (en) * | 2022-04-26 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of low-carbon bainite non-quenched and tempered hot-rolled round steel |
| EP4338862A4 (en) * | 2021-05-12 | 2025-06-11 | Daye Special Steel Co., Ltd. | Process for rolling high-strength, low-alloy steel with high toughness |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104471098A (en) * | 2012-12-04 | 2015-03-25 | “奥穆特宁斯克冶金厂”封闭式股份公司 | Low-alloy, high-strength structural steel |
| JP5998670B2 (en) * | 2012-06-27 | 2016-09-28 | Ｊｆｅスチール株式会社 | Low yield ratio high strength spiral steel pipe pile and manufacturing method thereof |
| WO2019122949A1 (en) * | 2017-12-18 | 2019-06-27 | Arcelormittal | Steel section having a thickness of at least 100mm and method of manufacturing the same |
-
2019
- 2019-10-15 CN CN201910979781.6A patent/CN110714172A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5998670B2 (en) * | 2012-06-27 | 2016-09-28 | Ｊｆｅスチール株式会社 | Low yield ratio high strength spiral steel pipe pile and manufacturing method thereof |
| CN104471098A (en) * | 2012-12-04 | 2015-03-25 | “奥穆特宁斯克冶金厂”封闭式股份公司 | Low-alloy, high-strength structural steel |
| WO2019122949A1 (en) * | 2017-12-18 | 2019-06-27 | Arcelormittal | Steel section having a thickness of at least 100mm and method of manufacturing the same |
Non-Patent Citations (3)
| Title |
|---|
| 吴润等: "《钢铁质量及其构件失效分析》", 30 April 2018, 北京航空航天大学出版社 * |
| 蔡开科: "《连铸坯质量控制》", 31 May 2010, 冶金工业出版社 * |
| 马琼: "《炼钢工艺与操作》", 31 January 2015, 北京理工大学出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455276A (en) * | 2020-04-24 | 2020-07-28 | 石钢京诚装备技术有限公司 | Large-size hot-rolled round steel with good low-temperature impact toughness and production method thereof |
| CN111455276B (en) * | 2020-04-24 | 2021-08-03 | 石钢京诚装备技术有限公司 | Large-size hot-rolled round steel with good low-temperature impact toughness and production method thereof |
| CN112746221A (en) * | 2020-12-25 | 2021-05-04 | 钢铁研究总院 | V-N microalloyed 550MPa hot-rolled thick-wall H-shaped steel and production process thereof |
| CN112746221B (en) * | 2020-12-25 | 2021-10-15 | 钢铁研究总院 | A V-N microalloyed 550MPa hot-rolled thick-walled H-beam and its production process |
| EP4338862A4 (en) * | 2021-05-12 | 2025-06-11 | Daye Special Steel Co., Ltd. | Process for rolling high-strength, low-alloy steel with high toughness |
| CN114892079A (en) * | 2022-04-26 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of low-carbon bainite non-quenched and tempered hot-rolled round steel |
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