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STEEL SHEET, PLATED STEEL SHEET, METHOD OF PRODUCTION OF HOT-ROLLED STEEL SHEET, METHOD OF PRODUCTION OF COLD-ROLLED FULL HARD STEEL SHEET, METHOD OF PRODUCTION OF STEEL SHEET, AND METHOD OF PRODUCTION OF PLATED STEEL SHEET
STEEL SHEET, PLATED STEEL SHEET, METHOD OF PRODUCTION OF HOT-ROLLED STEEL SHEET, METHOD OF PRODUCTION OF COLD-ROLLED FULL HARD STEEL SHEET, METHOD OF PRODUCTION OF STEEL SHEET, AND METHOD OF PRODUCTION OF PLATED STEEL SHEET
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机译:钢板,平板钢板,热轧钢板的制造方法,冷轧全硬钢板的制造方法,钢板的制造方法以及钢板的制造方法
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摘要
A steel sheet, a plated steel sheet, and methods for producing a hot-rolled steel sheet, a cold-rolled full hard steel sheet, and a steel sheet. The steel sheet has a specified composition and a microstructure including 0 to 60% of polygonal ferrite and 40 to 100% of a total of martensite, bainite, and residual austenite in terms of an area ratio within 20 μm from the steel sheet surface. The content of Mn in martensite present within 20 μm of the steel sheet surface ([Mn]SM) and the content of Mn in a bulk ([Mn]B) satisfy [Mn]SM/[Mn]B≤1.5. At a location 300 μm from the steel sheet surface, an area ratio of the martensite is in a range of 40 to 80%, and the polygonal ferrite and the bainite have an average crystal grain size of less than 15 μm.
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机译:钢板,镀覆钢板,以及热轧钢板,冷轧全硬质钢板和钢板的制造方法。钢板具有规定的组成和显微组织,以距钢板表面20μm以内的面积比计,该组织包括0至60%的多边形铁素体和40至100%的马氏体,贝氏体和残余奥氏体总量。钢板表面20μm以内的马氏体中Mn的含量([Mn] SM Sub>)和大块中的Mn的含量([Mn] B Sub>)满足[Mn] SM Sub> / [Mn] B Sub>≤1.5。在距钢板表面300μm的位置处,马氏体的面积率在40%至80%的范围内,并且多边形铁素体和贝氏体的平均晶粒尺寸小于15μm。
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