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Wear-resistant steel plate and method for producing same

专利摘要

[Problem] To provide a wear-resistant steel sheet which exhibits high wear resistance at high temperatures from 300°C to 500°C, while having toughness at low temperatures at the same time. [Solution] A steel sheet which has a component composition that contains from 0.10% to 0.23% of C, from 0.05% to 1.00% of Si, from 0.10% to 2.00% of Mn, 0.050% or less of P, 0.050% or less of S, 0.050% or less of Al, from 0.05% to 5.00% of Cr, 0.0100% or less of N and 0.0100% or less of O, while satisfying 1.0 = 0.45Cr + Mo = 2.25, with the balance being made up of Fe and unavoidable impurities, and which has a structure wherein the volume fraction of martensite at the depth of 1 mm from the surface of the steel sheet is 95% or more. With respect to this steel sheet, the Vickers hardness at 400°C is 288 or more and the Brinell hardness at 25°C is from 360 to 490 HBW10/3000 at the depth of 1 mm from the surface of the steel sheet. ......

基本信息

专利类型:
发明专利
申请/专利号:
CA3153769
申请日期:
2020-08-17
专利申请人:
杰富意钢铁株式会社
分类号:
C22C38/04 ; C21D8/02 ; C22C38/02 ; C22C38/38
发明/设计人:
权利要求: ¨ 23 ¨ CLAIMS: 1. A wear-resistant steel plate, comprising a chemical composition containing, in mass%, C: 0.10 % or more and 0.23 % or less, Si: 0.05 % or more and 1.00 % or less, Mn: 0.10 % or more and 2.00 % or less, P: 0.050 % or less, S: 0.050 % or less, Al: 0.050 % or less, Cr: 1.00 % or more and 5.00 % or less, N: 0.0100 % or less, and 0: 0.0100 % or less, with the balance being Fe and inevitable impurities, wherein the chemical composition satisfies the formula (1) 1.00 0.45 Cr + Mo 2.25 (1), where the element symbol in the formula (1) is a content of each element in mass%, and a content of an element that is not contained is 0, and a microstructure wherein a volume fraction of martensite at a depth of 1 mm from a surface of the steel plate is 95 % or more, and at a depth of 1 mm from a surface of the steel plate, a Vickers hardness at 400 C is 288 or more, and a Brinell hardness at 25 C is 360 HBW10/3000 to 490 HBW10/3000. 2. The wear-resistant steel plate according to claim 1, wherein the chemical composition further contains, in mass%, at least one selected from the group consisting of Mo: 1.80 % or less, Cu: 5.00 % or less, Ni: 5.00 % or less, V: 1.00 % or less, W: 1.00 % or less, Co: 1.00 % or less, Nb: 0.050 % or less, Ti: 0.100 % or less, ¨ 24 ¨ B: 0.0100 % or less, Ca: 0.0200 % or less, Mg: 0.0200 % or less, and REM: 0.0200 % or less. 3. A method for producing a wear-resistant steel plate, which is a method for producing the wear-resistant steel plate according to claim 1 or 2, comprising subjecting a steel material comprising the chemical composition described in claim 1 or 2 to hot rolling to obtain a hot-rolled steel plate, and subjecting the hot- rolled steel plate to direct quenching where a cooling start temperature is equal to or higher than Ar3 transformation point, a cooling stop temperature is equal to or lower than Mf point, and a cooling rate is 5 C/s or higher, or to reheating quenching where a cooling start temperature is equal to or higher than Ac3 transformation point, a cooling stop temperature is equal to or lower than the Mf point, and a cooling rate is C/s or higher, where the Mf point is determined by the following formula Mf ( C) = 410.5 ¨ 407.3 x C ¨ 7.3 x Si ¨ 37.8 x Mn ¨ 20.5 x Cu ¨ 19.5 x Ni ¨ 19.8 x Cr ¨ 4.5 x Mo, where the element symbol is the content of the element in mass%.