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HIGH-STRENGTH COLD-RIKKED STEEK SHEET, HIGH-STRENGTH GAVANIZED STEEL SHEET, AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND WELDABILITY, AND METHODS FOR MANUFACTUFING THE SAME
HIGH-STRENGTH COLD-RIKKED STEEK SHEET, HIGH-STRENGTH GAVANIZED STEEL SHEET, AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND WELDABILITY, AND METHODS FOR MANUFACTUFING THE SAME
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机译：具有卓越的成形性和可焊性的高强度冷弯钢板，高强度镀锌钢板和高强度合金热浸镀锌钢板及其制造方法
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摘要
Disclosed is a cold-rolled steel sheet which contains, by mass, 0.05-0.095% C, 0.15-2.0% Cr, 0.0003-0.01% B, 0.3-2.0% Si, 1.7-2.6% Mn, 0.005-0.14% Ti, 0.03% or less P, 0.01% or less S, 0.1% or less Al, less than 0.005% N, and 0.0005-0.005% O, with the remainder comprising iron and unavoidable impurities. The steel sheet composition has a polygonal ferrite mainly with a grain size of 4µm or less and hard compositions of bainite and martensite, wherein the block size of the martensite is no more than 0.9µm and the volume of Cr contained in the martensite is 1.1-1.5 times the amount of Cr contained in the polygonal ferrite, and has a tension strength of 880MPa and higher.
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