Quenching process of 1000MPa-level low-carbon high-strength steel plates
A high-strength steel plate and process technology, applied in the field of quenching technology, can solve the problems of steel plate toughness, reduced carbon diffusion rate, high content of alloy elements, etc., and achieve the effect of uneven structure, fine grain and uniform structure
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Embodiment 1
[0016] Embodiment 1: The quenching process of the 1000 MPa grade low-carbon high-strength steel plate is specifically as follows.
[0017] The chemical composition of this low-carbon high-strength steel plate is (wt): C 0.11%, Si 0.35%, Mn 1.4%, P 0.0010%, S0.05%, Ni 1.2%, Cr 0.5%, Nb 0.03%, Al 0.05%, Mo 0.48%, V 0.04%, Ti 0.02%, B 0.0015%, the balance is Fe and unavoidable impurities. The steel plate thickness is 20mm, AC1 is 710°C, and AC3 is 880°C.
[0018] The quenching process is as follows: (1) The first step quenching: heat the steel plate to 950°C, soak for 10 minutes; then cool down to 900°C, soak for 20 minutes; then quickly water-cooled and quenched.
[0019] (2) The second step quenching: reheat the steel plate after the first step quenching to 680°C at a heating rate of 200°C / h; then raise the temperature to 930°C at a heating rate of 300°C / h, and hold for 6 minutes ; Then lower the temperature to 900°C and keep it warm for 20 minutes; then quickly water-cooled ...
Embodiment 2
[0021] Embodiment 2: The quenching process of the 1000 MPa grade low-carbon high-strength steel plate is specifically as follows.
[0022] The chemical composition of this low-carbon high-strength steel plate is (wt): C 0.10%, Si 0.20%, Mn 1.1%, P 0.008%, S0.003%, Ni 1.0%, Cr 0.4%, Nb 0.02%, Al 0.03%, Mo 0.36%, V 0.01%, Ti 0.01%, B 0.0011%, the balance is Fe and unavoidable impurities. The steel plate thickness is 20mm, AC1 is 719°C, and AC3 is 890°C.
[0023] The quenching process is as follows: (1) The first step quenching: heat the steel plate to 940°C, soak for 20 minutes; then cool down to 900°C, soak for 30 minutes; then quickly water-cooled and quenched.
[0024] (2) The second step quenching: reheat the steel plate after the first step quenching to 709°C at a heating rate of 200°C / h; then raise the temperature to 930°C at a heating rate of 350°C / h, and hold for 10 minutes for a short time ; Then lower the temperature to 900°C and keep it warm for 30 minutes; then qui...
Embodiment 3
[0026] Embodiment 3: The quenching process of the 1000 MPa grade low-carbon high-strength steel plate is specifically as follows.
[0027] The chemical composition of this low-carbon high-strength steel plate is (wt): C 0.10%, Si 0.25%, Mn 1.3%, P 0.008%, S0.003%, Ni 1.0%, Cr 0.4%, Nb 0.02%, Al 0.03%, Mo 0.40%, V 0.04%, Ti 0.02%, B 0.0011%, the balance is Fe and unavoidable impurities. The steel plate thickness is 20mm, AC1 is 712°C, and AC3 is 883°C.
[0028] The quenching process is as follows: (1) The first step quenching: heat the steel plate to 943°C, soak for 0.8min / mm; then cool down to 901°C, soak for 1.3min / mm; then quench with rapid water cooling.
[0029] (2) The second step quenching: reheat the steel plate after the first step quenching to 697°C at a heating rate of 160°C / h; min / mm; then cool down to 898°C, keep warm for 1.3min / mm; then quickly water-cooled and quenched.
[0030] Using the above quenching process, the thickness of the steel plate is uniform, th...
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