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HOT-ROLLED STEEL SHEET FOR HIGH-STRENGTH ELECTRIC-RESISTANCE WELDED PIPE HAVING SOUR-GAS RESISTANCE AND EXCELLENT WELD TOUGHNESS, AND METHOD FOR MANUFACTURING THE SAME
HOT-ROLLED STEEL SHEET FOR HIGH-STRENGTH ELECTRIC-RESISTANCE WELDED PIPE HAVING SOUR-GAS RESISTANCE AND EXCELLENT WELD TOUGHNESS, AND METHOD FOR MANUFACTURING THE SAME
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机译:具有耐酸气和优异焊接韧性的高强度电阻焊管用热轧钢板及其制造方法
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摘要
A hot-rolled steel sheet for high-strength ERW pipes contains about 0.02% to about 0.06% C; about 0.05% to about 0.50% Si; about 0.5% to about 1.5% Mn; about 0.010% or less P; about 0.0010% or less S; about 0.01% to about 0.10% Al; about 0.01% to about 0.10% Nb; about 0.001% to about 0.025% Ti; about 0.001% to about 0.005% Ca; about 0.003% or less O; and about 0.005% or less N, and at least one element selected from the group consisting of about 0.01% to about 0.10% V; about 0.01% to about 0.50% Cu; about 0.01% to about 0.50% Ni; and about 0.01% to about 0.50% Mo on the basis of mass. The group of C, Si, Mn, Cu, Ni, Mo, and V and the group of Ca, O, and S satisfy specific relationships, and the microstructure of the steel sheet is composed of about 95% by volume or more bainitic ferrite. IMAGE
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