CN116334493A - 620 MPa-grade high-strength steel with welding heat affected zone at-60 ℃ and impact energy greater than 150J and preparation method thereof - Google Patents

620 MPa-grade high-strength steel with welding heat affected zone at-60 ℃ and impact energy greater than 150J and preparation method thereof Download PDF

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CN116334493A
CN116334493A CN202310329877.4A CN202310329877A CN116334493A CN 116334493 A CN116334493 A CN 116334493A CN 202310329877 A CN202310329877 A CN 202310329877A CN 116334493 A CN116334493 A CN 116334493A
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affected zone
heat affected
impact energy
temperature
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卢晓禹
袁晓鸣
王栋
黄利
白海瑞
王少炳
杨雄
李鹏
李�浩
吴鹏飞
温利军
董丽丽
岳祎楠
段燕林
杨源远
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Baotou Iron and Steel Group Co Ltd
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    • 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
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract

The invention discloses 620 MPa-level high-strength steel with a welding heat affected zone, impact energy of which is greater than 150J at minus 60 ℃, which comprises the following chemical components in percentage by mass: c:0.05 to 0.07 percent, si: less than or equal to 0.10 percent, mn:1.20 to 1.60 percent, P: < 0.010%, S: < 0.003%, alt:0.030 to 0.060 percent, ni:0.50 to 0.70 percent, cr:0.15 to 0.35 percent, nb:0.010 to 0.020%, V:0.015 to 0.030, ti:0.010 to 0.020, mo:0.20 to 0.40 percent, cu:0.20 to 0.30 percent. Its preparing process is also disclosed. The invention adopts reasonable working procedures and reasonable design components to ensure that the steel plate parent metal has good comprehensive performance, weakens or eliminates banded tissues, and realizes that the impact energy of a heat affected zone at minus 60 ℃ is more than 150J.

Description

620 MPa-grade high-strength steel with welding heat affected zone at-60 ℃ and impact energy greater than 150J and preparation method thereof
Technical Field
The invention relates to the field of metallurgical materials, in particular to 620 MPa-level high-strength steel with a welding heat affected zone-60 ℃ impact energy greater than 150J and a preparation method thereof.
Background
Currently, application No. 201680073035.5 discloses a high-strength steel having excellent low-temperature strain aging impact characteristics and weld heat affected zone impact characteristics and a method for manufacturing the same. The chemical composition and production process of high-strength steel for pressure vessel, offshore structure and other materials are introduced, and the influence of different heat input on the impact characteristics of heat affected zone is studied. The invention focuses on the composition and process design, and the band-shaped structure of the base material is improved, so that the band-shaped and hard phase structure of a heat affected zone during welding is further lightened, the impact performance of the heat affected zone is improved, and the impact function at minus 60 ℃ is more than 150J.
Application number 201310711812.2 discloses a thick steel plate excellent in toughness of a low-carbon equivalent weld heat affected zone and a method for manufacturing the same. The important point is that the impact energy of minus 40 ℃ under the welding of large linear energy is more than 100J by controlling the surface density of the micro inclusions with different diameters. The invention mainly improves the banded structure of the parent metal, avoids more serious banded structure and hard phase structure like martensite generated in the heat affected zone due to component segregation during welding, further reduces the impact toughness of the heat affected zone at minus 60 ℃, and improves the stability of the impact energy control at minus 60 ℃.
Application number 202010907406.3 discloses 500 MPa-level weather-resistant bridge steel with a welding heat affected zone and an impact energy of not lower than 54J at minus 40 ℃. The important points are component design and tissue control, so that the bridge steel is weather-proof and easy to weld. The invention focuses on the component and process design, and mainly improves the factors influencing the impact of the welding heat affected zone of the high-strength steel, so that the impact energy of the heat affected zone at the temperature of minus 60 ℃ is stably controlled to be more than 150J.
Disclosure of Invention
The invention aims to provide 620 MPa-level high-strength steel with a welding heat affected zone impact energy of more than 150J at minus 60 ℃ and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to 620 MPa-level high-strength steel with a welding heat affected zone, the impact energy of which is greater than 150J at the temperature of minus 60 ℃, which comprises the following chemical components in percentage by mass: c:0.05 to 0.07 percent, si: less than or equal to 0.10 percent, mn:1.20 to 1.60 percent, P: < 0.010%, S: < 0.003%, alt:0.030 to 0.060 percent, ni:0.50 to 0.70 percent, cr:0.15 to 0.35 percent, nb:0.010 to 0.020%, V:0.015 to 0.030, ti:0.010 to 0.020, mo:0.20 to 0.40 percent, cu:0.20 to 0.30 percent, and the balance of Fe and unavoidable impurities, wherein the mass fraction is 100 percent.
Further, the chemical components in percentage by mass comprise: c:0.058%, si:0.08%, mn:1.47%, P:0.008%, S:0.002%, als:0.042%, ni:0.575%, cr:0.195%, nb:0.016%, V:0.022%, ti:0.014%, mo:0.23%, cu:0.26 percent, and the balance of Fe and unavoidable impurities, wherein the mass fraction is 100 percent.
Further, the chemical components in percentage by mass comprise: c:0.061%, si:0.07%, mn:1.32%, P:0.007%, S:0.002%, als:0.051%, ni:0.63%, cr:0.21%, nb:0.014%, V:0.026%, ti:0.012%, mo:0.22%, cu:0.25 percent of Fe and unavoidable impurities, and the total mass fraction is 100 percent.
Further, the chemical components in percentage by mass comprise: c:0.067%, si:0.08%, mn:1.43%, P:0.008%, S:0.002%, als:0.045%, ni:0.67%, cr:0.26%, nb:0.012%, V:0.023%, ti:0.015%, mo:0.28%, cu:0.26 percent of Fe and the balance of unavoidable impurities, and the mass fraction is 100 percent.
A preparation method of 620MPa grade high-strength steel with a welding heat affected zone of-60 ℃ and an impact energy of more than 150J is characterized in that the preparation method adopts molten iron pretreatment-LF refining-RH refining-continuous casting-heating-rolling-cooling-normalizing-quenching-tempering process production; wherein:
the total amount under static light pressure is 10mm; heating to 1250+/-20 ℃ to ensure that the plate blank is completely austenitized and the alloy is fully dissolved; the finishing temperature is 790-820 ℃, so that the finish rolling is carried out in a completely unrecrystallized temperature area, and the crystal grains are only crushed, thereby obtaining fine austenite crystal grains; off-line normalizing is used, the normalizing temperature is 930+/-10 ℃, the temperature is kept for 120-180 min, and air cooling is performed, so that the alloy elements are fully diffused, and the banding caused by component segregation and the like generated by continuous casting is weakened or eliminated; quenching, wherein the quenching temperature is 890+/-10 ℃, and the heat preservation is carried out for 30-40 min, so that the alloy is ensured to be fully dissolved; the tempering temperature is 570-610 ℃, the heat preservation is carried out for 60-80 min, and the sufficient precipitation of carbide is ensured.
Furthermore, the comprehensive performance well-tempered sorbite tissue without the banded structure is finally obtained, the banded shape of the heat affected zone is slight and does not contain hard phase structure in the welding process, and the impact energy at minus 60 ℃ can be controlled to be more than 150J.
Still further, the method comprises the steps of.
Compared with the prior art, the invention has the beneficial technical effects that:
the tensile strength of the steel plate parent metal is 750-790 MPa, the impact energy at minus 60 ℃ is 286-327J, and the impact energy at minus 60 ℃ in the welding heat affected zone is 150-280J.
By adding normalizing between the rolling and tempering processes, the banded structure caused by component segregation in the continuous casting process is effectively reduced or eliminated, so that the tempered steel plate has no banded structure, the banded structure of a heat affected zone is slight and hard phase structures such as martensite are not generated in the welding process, and the impact energy at minus 60 ℃ can be controlled to be more than 150J.
The invention is mainly used for 620 MPa-level high-strength steel plates with excellent low-temperature high-toughness welding heat affected zones, and the steel plate materials are mainly used for structural parts such as frames, carriages and the like of mining vehicles.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 shows a metallographic strip structure (100 times) of a normalizing, quenching and tempering process;
FIG. 2 shows a metallographic strip structure (100 times) of a quenching and tempering process;
FIG. 3 is a diagram of a weld heat affected zone band structure (100 x left and 500 x right) of a normalizing + quenching + tempering process;
fig. 4 shows a strip structure of a weld heat affected zone (left 100 times, right 500 times) of a quenching and tempering process.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples 1-3 are the process steps adopted by the 620MPa grade high-strength steel with the impact energy of the welding heat affected zone of the invention at minus 60 ℃ being more than 150J and the preparation method thereof.
Example 1:
step a: through molten iron pretreatment, converter smelting, LF and RH refining, continuous casting and casting of slabs with the thickness of 250mm, and the composition C:0.058%, si:0.08%, mn:1.47%, P:0.008%, S:0.002%, als:0.042%, ni:0.575%, cr:0.195%, nb:0.016%, V:0.022%, ti:0.014%, mo:0.23%, cu:0.26%.
Step b: the slab is heated in a heating furnace, and the tapping temperature is 1252 ℃. The thickness specification of the rolled finished product is 10mm, and the final rolling temperature is 823 ℃.
Step c: and (5) carrying out off-line normalizing, wherein the normalizing temperature is 923 ℃, the heat preservation time is 134min, and the air cooling is carried out to the room temperature.
Step d: and (3) performing off-line quenching, wherein the quenching temperature is 892 ℃, the quenching heat preservation time is 35min, the water quenching is performed, and the water temperature is 22 ℃ and the quenching is performed to room temperature.
Step e: tempering temperature 603 ℃, heat preservation time 68min, air cooling to room temperature, sampling and welding.
Step f: and welding a sample by using a consumable electrode gas protection method, wherein the sample is a 60-degree V-shaped groove, and the filling welding voltage is 24V, the current is 230A, and the speed is 25cm/min. And (5) standing for 24 hours, and then detecting impact energy at minus 60 ℃ on the welding heat affected zone.
Example 2:
step a: through molten iron pretreatment, converter smelting, LF and RH refining, continuous casting and casting of slabs with the thickness of 250mm, and the composition C:0.061%, si:0.07%, mn:1.32%, P:0.007%, S:0.002%, als:0.051%, ni:0.63%, cr:0.21%, nb:0.014%, V:0.026%, ti:0.012%, mo:0.22%, cu:0.25%.
Step b: the slab is heated in a heating furnace, and the tapping temperature is 1253 ℃. The thickness specification of the rolled finished product is 16mm, and the final rolling temperature is 794 ℃.
Step c: and (5) carrying out off-line normalizing, wherein the normalizing temperature is 926 ℃, the heat preservation time is 142min, and air cooling is carried out to room temperature.
Step d: and (3) performing off-line quenching, wherein the quenching temperature is 888 ℃, the quenching heat preservation time is 38min, the water quenching is performed, and the water temperature is 22 ℃ and the quenching is performed to room temperature.
Step e: tempering temperature 598 ℃, heat preservation time 70min, air cooling to room temperature, sampling and welding.
Step f: and welding a sample by using a consumable electrode gas protection method, wherein the sample is a 60-degree V-shaped groove, and the filling welding voltage is 24V, the current is 230A, and the speed is 25cm/min. And (5) standing for 24 hours, and then detecting impact energy at minus 60 ℃ on the welding heat affected zone.
Example 3:
step a: through molten iron pretreatment, converter smelting, LF and RH refining, continuous casting and casting of slabs with the thickness of 250mm, and the composition C:0.067%, si:0.08%, mn:1.43%, P:0.008%, S:0.002%, als:0.045%, ni:0.67%, cr:0.26%, nb:0.012%, V:0.023%, ti:0.015%, mo:0.28%, cu:0.26%.
Step b: the slab was heated in a heating furnace and the tapping temperature was 1250 ℃. The thickness specification of the rolled finished product is 25mm, and the final rolling temperature is 792 ℃.
Step c: and (5) off-line normalizing, wherein the normalizing temperature is 928 ℃, the heat preservation time is 156min, and the air cooling is carried out to the room temperature.
Step d: and (3) performing off-line quenching, wherein the quenching temperature is 892 ℃, the quenching heat preservation time is 36min, the water quenching is performed, and the water temperature is 22 ℃ and the quenching is performed to room temperature.
Step e: tempering temperature 578 ℃, heat preservation time 66min, air cooling to room temperature, sampling and welding.
Step f: and welding a sample by using a consumable electrode gas protection method, wherein the sample is a 60-degree V-shaped groove, and the filling welding voltage is 24V, the current is 230A, and the speed is 25cm/min. And (5) standing for 24 hours, and then detecting impact energy at minus 60 ℃ on the welding heat affected zone.
Comparative example:
step a: through molten iron pretreatment, converter smelting, LF and RH refining, continuous casting and casting of slabs with the thickness of 250mm, and the composition C:0.058%, si:0.08%, mn:1.47%, P:0.008%, S:0.002%, als:0.044%, ni:0.58%, cr:0.22%, nb:0.013%, V:0.025%, ti:0.014%, mo:0.25%, cu:0.24%.
Step b: the slab is heated in a heating furnace, and the tapping temperature is 1255 ℃. The thickness specification of the rolled finished product is 25mm, and the final rolling temperature is 792 ℃.
Step c: and (3) performing off-line quenching, wherein the quenching temperature is 893 ℃, the quenching heat preservation time is 35min, the water quenching is performed, and the water temperature is 22 ℃ and the quenching is performed to room temperature.
Step d: tempering temperature 582 ℃ and heat preservation time 67min, air cooling to room temperature, sampling and welding.
Step e: and welding a sample by using a consumable electrode gas protection method, wherein the sample is a 60-degree V-shaped groove, and the filling welding voltage is 24V, the current is 230A, and the speed is 25cm/min. And (5) standing for 24 hours, and then detecting impact energy at minus 60 ℃ on the welding heat affected zone.
As shown in Table 1, examples 1 to 3 were comparable in base material properties to comparative examples, and the weld heat affected zone was stable in impact energy at-60℃and all above 150J, and the comparative examples were large in fluctuation and had values below 150J.
Table 1 properties of examples 1 to 3 and comparative examples
Figure BDA0004154593430000071
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (6)

1. The 620 MPa-grade high-strength steel with the impact energy of-60 ℃ in the welding heat affected zone being greater than 150J is characterized by comprising the following chemical components in percentage by mass: c:0.05 to 0.07 percent, si: less than or equal to 0.10 percent, mn:1.20 to 1.60 percent, P: < 0.010%, S: < 0.003%, alt:0.030 to 0.060 percent, ni:0.50 to 0.70 percent, cr:0.15 to 0.35 percent, nb:0.010 to 0.020%, V:0.015 to 0.030, ti:0.010 to 0.020, mo:0.20 to 0.40 percent, cu:0.20 to 0.30 percent, and the balance of Fe and unavoidable impurities, wherein the mass fraction is 100 percent.
2. The welding heat affected zone-60 ℃ high-strength steel of 620MPa level with an impact energy greater than 150J according to claim 1, wherein the chemical components in mass percent thereof comprise: c:0.058%, si:0.08%, mn:1.47%, P:0.008%, S:0.002%, als:0.042%, ni:0.575%, cr:0.195%, nb:0.016%, V:0.022%, ti:0.014%, mo:0.23%, cu:0.26 percent, and the balance of Fe and unavoidable impurities, wherein the mass fraction is 100 percent.
3. The welding heat affected zone-60 ℃ high-strength steel of 620MPa level with an impact energy greater than 150J according to claim 1, wherein the chemical components in mass percent thereof comprise: c:0.061%, si:0.07%, mn:1.32%, P:0.007%, S:0.002%, als:0.051%, ni:0.63%, cr:0.21%, nb:0.014%, V:0.026%, ti:0.012%, mo:0.22%, cu:0.25 percent of Fe and unavoidable impurities, and the total mass fraction is 100 percent.
4. The welding heat affected zone-60 ℃ high-strength steel of 620MPa level with an impact energy greater than 150J according to claim 1, wherein the chemical components in mass percent thereof comprise: c:0.067%, si:0.08%, mn:1.43%, P:0.008%, S:0.002%, als:0.045%, ni:0.67%, cr:0.26%, nb:0.012%, V:0.023%, ti:0.015%, mo:0.28%, cu:0.26 percent of Fe and the balance of unavoidable impurities, and the mass fraction is 100 percent.
5. The method for preparing the 620 MPa-level high-strength steel with the welding heat affected zone-60 ℃ impact energy greater than 150J according to claim 1, wherein the steel is produced by adopting a molten iron pretreatment-LF refining-RH refining-continuous casting-heating-rolling-cooling-normalizing-quenching-tempering process; wherein:
the total amount under static light pressure is 10mm; heating to 1250+/-20 ℃ to ensure that the plate blank is completely austenitized and the alloy is fully dissolved; the finishing temperature is 790-820 ℃, so that the finish rolling is carried out in a completely unrecrystallized temperature area, and the crystal grains are only crushed, thereby obtaining fine austenite crystal grains; off-line normalizing is used, the normalizing temperature is 930+/-10 ℃, the temperature is kept for 120-180 min, and air cooling is performed, so that the alloy elements are fully diffused, and the banding caused by component segregation and the like generated by continuous casting is weakened or eliminated; quenching, wherein the quenching temperature is 890+/-10 ℃, and the heat preservation is carried out for 30-40 min, so that the alloy is ensured to be fully dissolved; the tempering temperature is 570-610 ℃, the heat preservation is carried out for 60-80 min, and the sufficient precipitation of carbide is ensured.
6. The preparation method of claim 5, wherein the strip-shaped tissue is obtained by the method that the comprehensive performance of the strip-shaped tissue is good, the strip-shaped heat affected zone is slight and does not contain hard phase tissue in the welding process, and the impact energy at minus 60 ℃ can be controlled to be more than 150J.
CN202310329877.4A 2023-03-30 2023-03-30 620 MPa-grade high-strength steel with welding heat affected zone at-60 ℃ and impact energy greater than 150J and preparation method thereof Pending CN116334493A (en)

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