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HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT MOLDABILITY AND IMPACT RESISTANCE, AND METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT MOLDABILITY AND IMPACT RESISTANCE
HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT MOLDABILITY AND IMPACT RESISTANCE, AND METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT MOLDABILITY AND IMPACT RESISTANCE
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机译:具有优异模塑性和抗冲击性的高强度钢板,以及制造具有优异模塑性和抗冲击性的高强度钢板的方法
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摘要
A high-strength steel sheet includes a chemical composition including: by mass %, C: 0.080 to 0.500%, Si: 2.50% or less, Mn: 0.50 to 5.00%, P: 0.100% or less, S: 0.0100% or less, Al: 0.001 to 2.500%, N: 0.0150% or less, O: 0.0050% or less, and the balance: Fe and inevitable impurities. The high-strength steel sheet satisfying a predetermined formula has a microstructure in a region from ⅛t to ⅜t from a steel sheet surface. The microstructure includes: by volume %, 20% or more of acicular ferrite, 20% or more of an island-shaped hard structure including residual austenite, 2% to 25% of residual austenite, and 20% or less of aggregated ferrite.
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