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METHOD FOR PRODUCING HIGH STRENGTH THICK STEEL PLATE FOR BUILDING STRUCTURE, HAVING EXCELLENT TOUGHNESS TO SUPER-LARGE HEAT INPUT WELDING-AFFECTED ZONE
METHOD FOR PRODUCING HIGH STRENGTH THICK STEEL PLATE FOR BUILDING STRUCTURE, HAVING EXCELLENT TOUGHNESS TO SUPER-LARGE HEAT INPUT WELDING-AFFECTED ZONE
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机译:具有高韧性对超大热输入焊接影响区的高强度建筑结构厚钢板的制造方法
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摘要
PROBLEM TO BE SOLVED: To provide a method for producing a high strength thick steel plate for building structure having excellent toughness in a super-large heat input welding-affected zone.;SOLUTION: This production method employs a steel blank having a composition containing, by mass%: 0.05 to 0.15% C, 0.05 to 0.50% Si, 0.6 to 1.6% Mn, ≤0.005% S, and an appropriate amount of P, Al, Cu, and Ni. The steel blank further contains 0.005 to 0.030% Ti, 0.0003 to 0.0050% B, 0.0005 to 0.0050% Ca, 0.0030 to 0.0060% N, 0.0010 to 0.0030% O, and has 0.2 to 0.8 ACR defined by ACR={Ca-(0.18+130Ca)×O}/(1.25×S) and ≤0.47 Ceq. The steel blank is heated to a temperature in the range of 1,000 to 1,300°C, and subjected to hot-rolling having ≥900°C rolling finish temperature and then to accelerated cooling to ≤600°C at ≥1°C/s cooling speed. Further, this rolled steel plate is heated to a reheating temperature in two-phase range of (Ac1+10°C) to (Ac1+70°C) and desirably held for 5 to 60 min and thereafter rapidly cooled, subjected to reheating quenching and then tempering. Then, this steel blank may contain one or more kinds of Cr, V and Mo.;COPYRIGHT: (C)2005,JPO&NCIPI
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