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HIGH TENSILE STRENGTH STEEL SHEET FOR WELDED STRUCTURE HAVING EXCELLENT FATIGUE STRENGTH OF WELDED JOINT, AND WELDED JOINT
HIGH TENSILE STRENGTH STEEL SHEET FOR WELDED STRUCTURE HAVING EXCELLENT FATIGUE STRENGTH OF WELDED JOINT, AND WELDED JOINT
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机译：具有优良的焊接接头和焊接接头疲劳强度的焊接结构高强度钢板
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摘要
PROBLEM TO BE SOLVED: To provide a high tensile strength steel sheet for a welded structure which has excellent fatigue strength of a welded joint, and to provide a welded joint.;SOLUTION: The high tensile strength steel sheet for a welded structure having excellent fatigue strength of a welded joint has a composition containing, by mass, 0.005 to 0.2% C, 0.1 to 1.6% Si, 0.5 to 2% Mn, 0.05% P, 0.05% S, 0.0005 to 0.01% B, 0.01% N, 0.05 to 1% Al, and 0.005 to 0.5% Ti, and the balance Fe with inevitable components, and a carbon equivalent Ceq calculated by the following formula is 0.275 to 0.65%: Ceq (%)=C+Mn/6+(Cu+ Ni)/15+(Cr+Mo+V)/5+Nb/3. The welded joint having excellent fatigue strength consists of the same high tensile strength steel sheet, and, in the structure of a weld heat-affected zone therein, the area ratio of a bainitic structure is 60%, and the occupancy ratio of an intergranular ferritic structure is 10%.;COPYRIGHT: (C)2003,JPO
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机译：解决的问题：提供用于焊接结构的高抗拉强度钢板，其具有优异的焊接接头的疲劳强度，并提供焊接接头。;解决方案：用于焊接结构的高抗拉强度钢板，具有优异的疲劳强度焊接接头的强度具有以下成分：质量比为0.005至0.2％C，0.1至1.6％Si，0.5至2％Mn，0.05％P，0.05％S，0.0005至0.01％B，0.01％N> Al：0.05〜1％，Ti：0.005〜0.5％，具有不可避免成分的余量Fe，通过下式算出的碳当量Ceq为0.275〜0.65％：Ceq（％）= C + Mn / 6 +（Cu + Ni）/ 15 +（Cr + Mo + V）/ 5 + Nb / 3。具有优异的疲劳强度的焊接接头由相同的高抗拉强度钢板组成，并且在其中的焊接热影响区的结构中，贝氏体组织的面积率> 60％，并且晶界的占有率铁素体结构为10％.;版权所有：（C）2003，日本特许厅
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