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METHOD FOR PRODUCING NON-HEAT TREATED HIGH STRENGTH STEEL HAVING EXCELLENT TOUGHNESS IN WELD HEAT-AFFECTED ZONE SUBJECTED TO ULTRAHIGH HEAT INPUT WELDING
METHOD FOR PRODUCING NON-HEAT TREATED HIGH STRENGTH STEEL HAVING EXCELLENT TOUGHNESS IN WELD HEAT-AFFECTED ZONE SUBJECTED TO ULTRAHIGH HEAT INPUT WELDING
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机译：具有超高热输入焊接效果的焊接热影响区中具有优异韧性的非热处理高强度钢的生产方法
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摘要
PROBLEM TO BE SOLVED: To stably obtain excellent toughness not only in a base material but also in a weld heat affected zone even when ultrahigh heat input welding in which welding heat input exceeds 600kJ/cm is performed to high strength steel having a tensile strength of ≥570MPa.;SOLUTION: High strength steel having a tensile strength of ≥570MPa is subjected to regulation of components so that an Ac4 point to form an (α+γ)2 phase in a high temperature region from a γ single phase exists in ≤1,400°C, and the structure of the weld heat-affected zone consists of a bainite single phase.;COPYRIGHT: (C)2004,JPO
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