On-line quenching production method of low-cost high-strength abrasion-resistant steel plate
A technology of wear-resistant steel plate and production method, which is applied in the field of on-line quenching production of low-cost high-strength wear-resistant steel plate, can solve problems such as harsh working conditions, short production process, and long cycle, and achieve short production cycle, low cost, and low cost. The effect of final cooling temperature
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Embodiment 1
[0025] Low-cost high-strength wear-resistant steel plate, thickness 16mm:
[0026] 1) Billet selection: The chemical composition of the cast billet is: C 0.16%, Si 0.31%, Mn 1.45%, P ≤0.015%, S ≤0.008%, Cr 0.31%, Al 0.037%, Ti 0.016%, B 0.0017% , the rest is iron Fe and unavoidable impurities;
[0027] 2) Rolling process: the billet heating temperature is 1190°C, the rolling start temperature is 1070°C, the final rolling temperature is 945°C, and the water entry temperature is 910°C;
[0028] 3) On-line quenching process: the average rate in the cooling zone is 40°C / S, and the cooling termination temperature is 200°C;
[0029] 4) Tempering process: the tempering temperature is 350°C, and the holding time is 1 hour.
[0030] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1300MPa, the elongation is 14.5%, the average impact energy at -20°C is 80J, and the average surface Brinell hardness is HB 395....
Embodiment 2
[0032] Low-cost high-strength wear-resistant steel plate, thickness 25mm:
[0033] 1) Billet selection: The chemical composition of the cast billet is: C 0.17%, Si 0.30%, Mn 1.42%, P ≤0.015%, S ≤0.008%, Cr 0.43%, Al 0.035%, Ti 0.015%, B 0.0018% , the rest is iron Fe and unavoidable impurities;
[0034] 2) Rolling process: the billet heating temperature is 1195°C, the rolling start temperature is 1060°C, the final rolling temperature is 940°C, and the water entry temperature is 915°C;
[0035] 3) On-line quenching process: the average rate in the cooling zone is 38°C / S, and the cooling termination temperature is 210°C;
[0036] 4) Tempering process: the tempering temperature is 350°C, and the holding time is 1 hour.
[0037] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1250MPa, the elongation is 12.5%, the average impact energy at -20°C is 75J, and the average surface Brinell hardness is HB 385....
Embodiment 3
[0039] Low-cost high-strength wear-resistant steel plate, thickness 30mm:
[0040] 1) Billet selection: The chemical composition of the cast billet is: C 0.18%, Si 0.31%, Mn 1.48%, P ≤0.015%, S ≤0.008%, Cr 0.45%, Al 0.034%, Ti 0.014%, B 0.0016% , the rest is iron Fe and unavoidable impurities;
[0041] 2) Rolling process: the billet heating temperature is 1198°C, the rolling start temperature is 1065°C, the final rolling temperature is 935°C, and the water entry temperature is 920°C;
[0042] 3) On-line quenching process: the average rate in the cooling zone is 30°C / S, and the cooling termination temperature is 190°C;
[0043] 4) Tempering process: the tempering temperature is 400°C, and the holding time is 1.5 hours.
[0044] Through the above process, the mechanical properties of the wear-resistant steel plate are as follows: the tensile strength is 1230MPa, the elongation is 15.5%, the average impact energy at -20°C is 70J, and the average surface Brinell hardness is HB 380...
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