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High strength high ductility steel sheet excellent in production stability, method for producing the same, and cold rolled base sheet used for production of high strength high ductility steel sheet
High strength high ductility steel sheet excellent in production stability, method for producing the same, and cold rolled base sheet used for production of high strength high ductility steel sheet
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机译:生产稳定性优异的高强度高延展性钢板,其制造方法以及用于高强度高延展性钢板的制造的冷轧基体板
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摘要
PROBLEM TO BE SOLVED: To provide a high strength high ductility steel sheet excellent in production stability, a manufacturing method thereof, and a cold rolled original sheet used for manufacturing the strength high ductility steel sheet.SOLUTION: A high strength high ductility steel sheet includes, by mass%, 0.07 to 0.15% C, 0% to 0.8% Si, 1.2 to 2.1% Mn, 0.5 to 2.1% Cr, over 0% to 0.02% or less P, over 0% to 0.01% or less S, over 0% to 0.15% or less Al, over 0% to 0.01% or less N, and 0.0005 to 0.01% B, and the balance Fe with inevitable impurities. The contents of the C, Si, Mn and Cr satisfy a formula (1) below, and a metallographic structure thereof includes ferrite of 20 to 40 area%, and tempered martensite: 140≤442×C-7.7×Si+53×Mn+31×Cr≤168 (1). In the formula (1), C, Si, Mn, and Cr denote the content of the respective components by mass%.SELECTED DRAWING: None
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