CN114480961B - 620MPa grade high-strength steel with cold crack sensitivity coefficient less than or equal to 0.19 and production method thereof - Google Patents

620MPa grade high-strength steel with cold crack sensitivity coefficient less than or equal to 0.19 and production method thereof Download PDF

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CN114480961B
CN114480961B CN202111596894.1A CN202111596894A CN114480961B CN 114480961 B CN114480961 B CN 114480961B CN 202111596894 A CN202111596894 A CN 202111596894A CN 114480961 B CN114480961 B CN 114480961B
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陈尹泽
黄重
韦弦
王新志
孙斌
宋立伟
李娜
徐党委
徐博
赵良生
孙志远
张青龙
娄军魁
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Anyang Iron and Steel Co Ltd
Anyang Iron and Steel Group Co Ltd
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Abstract

The invention provides 620 MPa-grade high-strength steel with a cold crack sensitivity coefficient less than or equal to 0.19, which comprises the following chemical components in percentage by weight: c:0.06 to 0.08%, si:0.12 to 0.50%, mn:1.50 to 1.85 percent, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, cr:0.20 to 0.60%, nb:0.015% -0.060%, alt: 0.010-0.060% of Ti:0.008 to 0.035 percent, less than or equal to 0.005 percent of B, less than or equal to 0.08 percent of Mo, less than or equal to 0.15 percent of Ni, less than or equal to 0.15 percent of Cu, less than or equal to 0.19 percent of Pcm, and the balance of Fe and inevitable impurities. According to the invention, precious metals Mo, ni, cu and V are not added in the component design, the effects of C, mn, cr and B elements are fully exerted, and the microstructure is refined by adopting a controlled rolling and three-stage controlled cooling process and a tempering process, so that the 620 MPa-grade high-strength steel with the cold crack sensitivity coefficient less than or equal to 0.19 is obtained.

Description

620MPa grade high-strength steel with cold crack sensitivity coefficient less than or equal to 0.19 and production method thereof
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to 620MPa grade high-strength steel with a cold crack sensitivity coefficient less than or equal to 0.19 and a production method thereof.
Background
The cold crack sensitivity index Pcm (Pcm = C + Si/30+ (Mn + Cu + Cr)/20 + Ni/60+ Mo/15+ V/10+ 5B) is a method for judging the weldability of steel, and mainly judges the cold crack tendency of the steel. The larger the cold crack sensitivity index is, the greater the tendency of the steel to crack during welding, and the poorer the weldability is. And the high-strength steel has higher cold crack sensitivity coefficient Pcm value due to the addition of higher content of Mo, ni, cu, cr and other alloy elements, and is unfavorable for the weldability of downstream users.
The invention discloses a Chinese invention patent application number 202010595871.8, which discloses an easily welded ultrahigh-strength steel with a cold crack sensitivity coefficient of less than or equal to 0.25 and a production method thereof, wherein the invention refines crystal grains and homogenizes the structure through TMCP, ultra-fast cooling and tempering processes, but the invention has the defects that the steel contains higher precious alloy elements such as Mo and the like, the production cost is high, pcm is less than or equal to 0.25, and the cold crack sensitivity coefficient is higher.
Chinese invention patent application number 202010210268.3 discloses a high-strength weather-proof steel plate for building bridges and a manufacturing method thereof, rp0.2 is more than or equal to 620MPa, rm:730 MPa-850 MPa, elongation A after fracture is more than or equal to 16 percent, and longitudinal and transverse KV2 at minus 40 ℃ is more than or equal to 120J.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides 620MPa grade high-strength steel with a cold crack sensitivity coefficient less than or equal to 0.19 and a production method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme, and aims to provide 620MPa grade high-strength steel with the cold crack sensitivity coefficient of less than or equal to 0.19 and a production method thereof, wherein precious metals Mo, ni, cu and V are not added in the component design, the effects of C, mn, cr and B elements are fully exerted, and the controlled rolling and three-stage controlled cooling process and tempering process are adopted to refine the structure, so that the 620MPa grade high-strength steel with the cold crack sensitivity coefficient of less than or equal to 0.19 and the production method thereof are obtained.
In order to achieve the purpose, the invention adopts the technical scheme that:
620MPa grade high strength steel with cold crack sensitivity coefficient less than or equal to 0.19 comprises the following chemical components in percentage by weight: c:0.06 to 0.08%, si:0.12 to 0.50%, mn: 1.50-1.85%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:0.20 to 0.60%, nb:0.015% -0.060%, alt: 0.010-0.060%, ti:0.008 to 0.035 percent, less than or equal to 0.005 percent of B, less than or equal to 0.08 percent of Mo, less than or equal to 0.15 percent of Ni, less than or equal to 0.15 percent of Cu, less than or equal to 0.19 percent of Pcm, and the balance of Fe and inevitable impurities.
A production method of 620MPa grade high-strength steel with a cold crack sensitivity coefficient less than or equal to 0.19 comprises the following steps:
(1) slab reheating temperature: 1200-1250 ℃, controlling the heating rate at 6-8 ℃/s, and preserving the heat for not less than 30min at the temperature of 1150-1250 ℃;
(2) rolling temperature interval of recrystallization zone: 980-1150 ℃, and the total rolling reduction rate of the recrystallization zone is more than or equal to 40 percent;
(3) rolling temperature interval of non-recrystallization zone: the initial rolling temperature of finish rolling is 870-930 ℃, the rolling total reduction rate of the non-recrystallization zone is more than or equal to 60%, and the final rolling temperature interval is as follows: 760 to 850 ℃.
(4) After rolling, three-stage controlled cooling is adopted, wherein air cooling is adopted in the first stage, the air cooling starting temperature is 740-850 ℃, and the air cooling finishing temperature is 700-780 ℃; the cooling starting temperature of the second stage is 700-780 ℃, the temperature of red return is 350-430 ℃, the ratio of water to water is 1.25-1.30, the cooling rate is 15-30 ℃/s, and the final cooling temperature is 380-420 ℃.
(5) The tempering temperature of the heat treatment tempering process is 450-520 ℃, the tempering coefficient is 3.0min/mm, the steel plate is air-cooled to room temperature after being taken out of the furnace, and the microstructure of the tempered steel plate is low-carbon bainite.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, only a small amount of Nb and Cr alloy elements are added, noble metals Mo, ni, cu and V are not added, and the alloy cost is lower than that of steel plates with the same strength grade and the same specification of other enterprises.
(2) The 620 MPa-grade high-strength steel produced by the invention has the cold crack sensitivity coefficient less than or equal to 0.19, and the welding performance is superior to that of the same-strength-grade same-specification steel plates of other enterprises; .
(3) The invention controls rolling and tempering process treatment, and has uniform structure in the thickness direction and good toughness and plasticity.
Drawings
FIG. 1 is a microstructure diagram of a steel sheet manufactured in example 1 of the present invention;
FIG. 2 is a microstructure diagram of a steel sheet manufactured in example 2 of the present invention;
FIG. 3 is a microstructure diagram of a steel sheet manufactured in example 3 of the present invention;
FIG. 4 is a microstructure view of a steel sheet manufactured in example 4 of the present invention.
Detailed Description
The technical solutions and effects of the present invention are further described below with reference to the accompanying drawings and specific embodiments, but the scope of the present invention is not limited thereto.
Examples
620MPa grade high strength steel with cold crack sensitivity coefficient less than or equal to 0.19 and a production method thereof, comprising the following chemical components by weight percent: c:0.06 to 0.08%, si:0.12 to 0.50%, mn: 1.50-1.85%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:0.20 to 0.60%, nb:0.015% -0.060%, alt:0.010% -0.060%, ti: 0.008-0.035%, B is less than or equal to 0.005%, mo is less than or equal to 0.08%, ni: less than or equal to 0.15 percent, less than or equal to 0.15 percent of Cu, less than or equal to 0.19 percent of Pcm, and the balance of Fe and inevitable impurities.
The method comprises the following steps:
(1) slab reheating temperature: 1200-1250 ℃, controlling the heating rate at 6-8 ℃/s, and preserving the heat for not less than 30min at the temperature of 1150-1250 ℃;
(2) rolling temperature interval of recrystallization zone: 980-1150 ℃, and the total rolling reduction rate of the recrystallization zone is more than or equal to 40 percent;
(3) rolling temperature interval of non-recrystallization zone: the initial rolling temperature of finish rolling is 870-930 ℃, the rolling total reduction rate of the non-recrystallization zone is more than or equal to 60%, and the final rolling temperature interval is as follows: 760 to 850 ℃.
(4) After rolling, three-stage controlled cooling is adopted, air cooling is adopted in the first stage, the air cooling starting temperature is 740-850 ℃, and the air cooling finishing temperature is 700-780 ℃; the cooling starting temperature of the second stage is 700-780 ℃, the temperature of red return is 350-430 ℃, the ratio of water to water is 1.25-1.30, the cooling rate is 15-30 ℃/s, and the final cooling temperature is 380-420 ℃.
(5) The tempering temperature of the heat treatment tempering process is 450-520 ℃, the tempering coefficient is 3.0min/mm, the steel plate is discharged from a furnace and then is air-cooled to room temperature, and the microstructure of the tempered steel plate is low-carbon bainite as shown in figures 1-4.
The chemical compositions of the examples are shown in Table 1.
The key rolling, cooling and heat treatment process parameters for each example are shown in table 2.
The mechanical property test results of the examples are shown in table 3, and the toughness and plasticity are good.
Chemical composition of the examples in Table 1%
C Si Mn P S Al Ti Cr Nb B Carbon equivalent Coefficient of susceptibility to cracking
Example 1 0.06 0.2 1.66 0.013 0.002 0.034 0.015 0.29 0.037 0.0017 0.4 0.18
Example 2 0.07 0.2 1.68 0.013 0.004 0.030 0.018 0.29 0.033 0.0016 0.41 0.19
Example 3 0.07 0.3 1.72 0.015 0.002 0.032 0.017 0.29 0.039 0.0018 0.42 0.19
Example 4 0.07 0.2 1.67 0.014 0.001 0.031 0.014 0.30 0.040 0.0019 0.41 0.19
TABLE 2 Process System
Figure BDA0003430648710000031
Examples 1 to 4, slab reheating temperature was 1235 to 1250 ℃, heating time was 130min, recrystallization zone start rolling temperature was 1079 to 1100 ℃, recrystallization zone final rolling temperature was 1042 to 1063 ℃, rolling pass reduction of recrystallization zone was not less than 15% (at least one pass was achieved), total reduction of recrystallization zone was 40% or more, non-recrystallization zone start rolling temperature was 877 to 912 ℃, total reduction of non-recrystallization zone rolling was not less than 60%, final rolling temperature interval: 780-807 ℃. After rolling, three stages of controlled cooling are adopted, wherein air cooling is adopted in the first stage, the air cooling starting temperature is 796-765 ℃, and the air cooling finishing temperature is 766-735 ℃; the beginning temperature of the cooling at the beginning of the second stage is 766-735 ℃, the temperature of the red returning is 350-430 ℃, the ratio of water to water is 1.25-1.30, the cooling rate is 20-30 ℃/s, and the final cooling temperature range is 380-450 ℃. The tempering temperature of the heat treatment tempering process is 450-520 ℃, the tempering coefficient is 3.0min/mm, the steel plate is air-cooled to room temperature after being taken out of the furnace, and the microstructure of the tempered steel plate is low-carbon bainite.
The steel sheets produced according to the procedure of this example had the performance indexes shown in Table 3.
TABLE 3 Performance index of the steel sheets manufactured in examples
Figure BDA0003430648710000041
As can be seen from Table 3, the 620MPa grade high-strength steel with the cold crack sensitivity coefficient less than or equal to 0.19 and the production method are obtained by controlling rolling elements, and refining the structure by adopting a controlled rolling, three-stage controlled cooling process and a tempering process.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. 620 MPa-grade high-strength steel with the cold crack sensitivity coefficient of less than or equal to 0.19 and the thickness of 30mm is characterized by comprising the following chemical components in percentage by weight: c:0.06 to 0.07%, si:0.20 to 0.30%, mn:1.66 to 1.72%, P:0.013 to 0.015%, S:0.002 to 0.004%, cr:0.29%, nb:0.033% -0.039%, alt:0.030% -0.034%, ti:0.015% -0.018%, B:0.0016 to 0.0018%, pcm = C + Si/30+ (Mn + Cu + Cr)/20 + Ni/60+ Mo/15+ V/10+5B:0.18 to 0.19, and the balance of Fe and inevitable impurities;
the production method of the 620 MPa-grade high-strength steel with the cold crack sensitivity coefficient less than or equal to 0.19 comprises the following steps:
slab reheating temperature: heating for 130min at 1235-1248 ℃, controlling the heating rate to 6~8 ℃/s, and preserving the heat at 1150-1250 ℃ for not less than 30min;
the rolling temperature of a recrystallization zone is 1079 to 1100 ℃, the final rolling temperature of the recrystallization zone is 1042 to 1063 ℃, and the rolling total reduction rate of the recrystallization zone is 41 to 45 percent; the rolling temperature of the unrecrystallized area is 877 to 890 ℃, the rolling total reduction rate of the unrecrystallized area is 63 to 66 percent, and the rolling temperature of the unrecrystallized area is 795 to 807 ℃;
after rolling, three-stage controlled cooling is adopted, air cooling is adopted in the first stage, the air cooling starting temperature is 796 to 765 ℃, and the air cooling finishing temperature is 766 to 735 ℃; in the second stage, the cooling starting temperature is 766-735 ℃, the re-reddening temperature is 350-430 ℃, the water-water ratio is 1.25-1.30, the cooling rate is 22-28 ℃/s, and the final cooling temperature range is 390-410 ℃; the tempering temperature of the heat treatment tempering process is 450-520 ℃, the tempering coefficient is 3.0min/mm, the tempering time in a furnace is 105-110h, the steel plate is taken out of the furnace and then cooled in air to room temperature, and the microstructure of the steel plate after tempering is low-carbon bainite.
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JP2010516895A (en) * 2007-10-26 2010-05-20 宝山鋼鉄股▲分▼有限公司 Yield strength 800 MPa class low weld crack sensitive steel plate and method for producing the same
CN108300939A (en) * 2018-01-22 2018-07-20 五矿营口中板有限责任公司 A kind of low cost Q550D high strength steel plates and its production method
CN112553530A (en) * 2020-12-04 2021-03-26 安阳钢铁股份有限公司 Low-yield-ratio 700MPa high-strength bridge steel and manufacturing method thereof
CN112575257A (en) * 2020-12-04 2021-03-30 安阳钢铁股份有限公司 Low-cost boron-containing non-quenched and tempered 700MPa high-strength steel and manufacturing method thereof

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