首页> 外国专利> HIGH-STRENGTH THICK STEEL PLATE HAVING TENSILE STRENGTH (TS) OF 780 MPa OR HIGHER, AND EXCELLENT IN TOUGHNESS OF HEAT-AFFECTED ZONE IN HIGH-HEAT-INPUT WELD AND IN HARDENING RESISTANCE OF HEAT-AFFECTED ZONE IN LOW-HEAT-INPUT WELD, AND METHOD FOR PRODUCTION THEREOF

HIGH-STRENGTH THICK STEEL PLATE HAVING TENSILE STRENGTH (TS) OF 780 MPa OR HIGHER, AND EXCELLENT IN TOUGHNESS OF HEAT-AFFECTED ZONE IN HIGH-HEAT-INPUT WELD AND IN HARDENING RESISTANCE OF HEAT-AFFECTED ZONE IN LOW-HEAT-INPUT WELD, AND METHOD FOR PRODUCTION THEREOF

机译：具有780 MPa或更高的拉伸强度（TS）的高强度厚钢板，并且在高热焊接区的热影响区的韧性和低热输入区的热影响区的硬化阻力方面都表现出色，及其生产方法

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摘要

PROBLEM TO BE SOLVED: To provide a high-strength thick steel plate having a base material performance of tensile strength of ≥780 MPa, having stable high toughness in a single-layer heat-affected zone in high-heat-input weld whose welding heat input exceeds 400 kJ/cm, and excellent in hardening resistance of a heat-affected zone in low-heat-input weld, and to provide a method for production thereof.;SOLUTION: The steel plate contains, by mass, 0.03-0.075% C, 0.01-0.40% Si, 0.1-1.3% Mn, 2.0-5.0% Cr, 0.01-0.05% each P, S and Al, 0.005-0.03% Ti, 0.002-0.007% N, at least one of Cu, Ni, Mo, Nb, V, REM, Ca and Mg as needed, substantially no B, and the balance Fe with inevitable impurities. After a cast slab or steel billet, which comprises the steel composition, is reheated at 1,000 to 1,250°C, hot rolling in which a rolling finish temperature becomes 750°C or more is performed, or after hot rolling, the slab or billet is reheated at a transformation point Ac3 or higher, is cooled to room temperature after retained, and further is tempered at 400 to 650°C.;COPYRIGHT: (C)2012,JPO&INPIT

机译：解决的问题：提供一种高强度厚钢板，其基体材料的抗拉强度性能为780 MPa以上，并且在高热输入焊接的单层热影响区中具有稳定的高韧性。热输入超过400kJ / cm，并且在低热输入焊缝中的热影响区具有优异的抗硬化性，并提供其生产方法。;解决方案：钢板按质量计含有0.03-0.075 ％C，0.01-0.40％Si，0.1-1.3％Mn，2.0-5.0％Cr，0.01-0.05％P，S和Al，0.005-0.03％Ti，0.002-0.007％N，Cu中的至少一种， Ni，Mo，Nb，V，REM，Ca和Mg根据需要，基本上不含B，其余的Fe具有不可避免的杂质。在将包含钢组合物的铸坯或钢坯在1,000至1,250℃下再加热之后，进行热轧，在该轧制中，轧制结束温度达到750℃或更高，或者在热轧后，对该坯或坯进行热轧。将其在相变点Ac3或更高的温度下重新加热，保留后冷却至室温，然后在400至650°C的温度进行回火;版权所有：（C）2012，JPO＆INPIT

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公开/公告号JP2012177192A

专利类型
公开/公告日2012-09-13

原文格式PDF
申请/专利权人 JFE STEEL CORP;
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申请/专利号JP20120016058
发明设计人 UEDA KEIJI;SUZUKI SHINICHI;
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申请日2012-01-30
分类号C22C38/00;C22C38/28;C21D8/02;C22C38/54;
国家 JP
入库时间 2022-08-21 17:44:32

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