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STEEL MATERIAL EXCELLENT IN FATIGUE-CRACK PROPAGATION RESISTANCE AND LOW-TEMPERATURE TOUGHNESS AT WELD HEAT-AFFECTED ZONE, AND METHOD FOR PRODUCTION THEREOF
STEEL MATERIAL EXCELLENT IN FATIGUE-CRACK PROPAGATION RESISTANCE AND LOW-TEMPERATURE TOUGHNESS AT WELD HEAT-AFFECTED ZONE, AND METHOD FOR PRODUCTION THEREOF
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机译：焊接热影响区中具有优异的抗疲劳裂纹扩展性和低温韧性的优异钢材料及其制造方法
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摘要
PROBLEM TO BE SOLVED: To provide a steel material excellent in fatigue-crack propagation resistance and low-temperature toughness of HAZ.;SOLUTION: The steel material excellent in fatigue-crack propagation resistance and low-temperature toughness at a weld heat-affected zone contains, by mass, 0.01-0.10% C, 0.04-0.60% Si, 0.5-2.0% Mn, ≤0.015% P, ≤0.004% S, 0.005-0.07% Al, 0.004-0.025% Ti, 0.0005-0.0040% B, 0.0040-0.0090% N, and the balance Fe with impurities. The steel material has, by area ratio, ≥50% of bainitic structure, ≤5% of pearlitic structure and the balance of ferritic structure, has the difference of Vickers hardness of a surface layer part and a thickness center part, of ≤50 and satisfies formula (1): Ti/N≤3.4 and formula (2): 0.0003≤B-10.8/14.1×(N-Ti/3.4)≤0.003 (wherein atomic symbols each means the content (mass%) of the element).;COPYRIGHT: (C)2013,JPO&INPIT
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