ULTRAHIGH-STRENGTH STEEL SHEET HAVING EXCELLENT YIELD RATIO, AND MANUFACTURING METHOD THEREFOR
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United States of America
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Issued Date -
Dec 5, 2024
app pub date -
Aug 9, 2024
filing date -
Aug 9, 2024
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Abstract
One aspect of the present invention relates to an ultrahigh-strength steel sheet having an excellent yield ratio, comprising, by wt %, 0.3-0.5% of C, 2.0% (excluding 0%) of Si, 3.0-6.5% of Mn, 0.02% or less of P, 0.01% or less of S, 0.01-3.0% of Al, 0.02% or less (excluding 0%) of N, and the balance of Fe and other inevitable impurities, and a microstructure comprises 5-30% of remaining austenite by area fraction and comprises 5% or less of secondary martensite.
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