首页> 外国专利> HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING SMALL VARIATIONS IN STRENGTH AND DUCTILITY AND METHOD FOR PRODUCING SAME

HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING SMALL VARIATIONS IN STRENGTH AND DUCTILITY AND METHOD FOR PRODUCING SAME

机译:高强度延展性小变化的高强度冷轧钢板及其制造方法

摘要

A high strength cold rolled steel sheet which: has a component composition comprising in mass% 0.05 to 0.30% of C 3.0% or less (excluding 0%) of Si 0.1 to 5.0% of Mn 0.1% or less (excluding 0%) of P 0.02% or less (excluding 0%) of S 0.01 to 1.0% of Al 0.01% or less (excluding 0%) of N and a remainder made up by iron and unavoidable impurities; contains a ferrite at an area ratio of 20 to 50% as a soft first phase with the remainder being a hard second phase; and has a tissue comprising tempered martensite and/or tempered bainite and is controlled in such a manner that cementite particles having proper sizes are present in grains of the ferrite at a proper number density.
机译:1,一种高强度冷轧钢板,其成分组成为:以质量%计,C含量为0.05%至0.30%,Si含量为3.0%以下(不含0%),Mn含量为0.1%至5.0%(不含0%),含量为0.1%以下(不含0%) S的P的P≤0.02%(不包括0%),N的Al≤P≤0.02%(不包括0%)的1.0%,其余部分由铁和不可避免的杂质组成;包含面积比为20%至50%的铁素体作为软质第一相,其余为硬质第二相;并具有包含回火马氏体和/或回火贝氏体的薄纸,并以这样的方式进行控制:具有适当尺寸的渗碳体颗粒以适当的数量密度存在于铁素体的晶粒中。

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