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METHOD FOR PRODUCING HIGH TENSION THICK STEEL PLATE EXCELLENT IN BRITTLE CRACK PROPAGATION STOPPING CHARACTERISTIC AND SUPPER LARGE INLET-HEAT WELDING-HEAT AFFECTED PART TOUGHNESS
METHOD FOR PRODUCING HIGH TENSION THICK STEEL PLATE EXCELLENT IN BRITTLE CRACK PROPAGATION STOPPING CHARACTERISTIC AND SUPPER LARGE INLET-HEAT WELDING-HEAT AFFECTED PART TOUGHNESS
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机译：产生高强度厚钢板的方法，在脆性裂纹扩展，停止特征和超大的入口热焊接热影响零件韧性方面表现出色
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摘要
PROBLEM TO BE SOLVED: To provide a high tension thick steel plate provided with high strength of ≥590 MPa tensile strength and excellent brittle crack propagation-stopping characteristic and supper large inlet-heat HAZ toughness.;SOLUTION: A steel blank having the composition composed by mass% of 0.001-0.013% C, 0.01-0.6% Si, 1.0-2.0% Mn, 0.005-0.10% Al, ≤0.004% Nb, ≤0.010% V, 0.20-1.0% Mo, 0.0003-0.0050% B, 0.005-0.050% Ti, 0.0010-0.0060% N and the balance Fe with inevitable impurities, is hot-rolled under condition of ≥50% accumulative rolling-reduction ratio in austenitic non-recrystallizing zone and 650-800°C rolling-finish temperature, after heating to 950-1,250°C, and thereafter, cooled to ≤580°C at ≥7°C/s cooling speed.;COPYRIGHT: (C)2005,JPO&NCIPI
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