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CN101688279B 屈服强度低、材质变化小的高强度热镀锌钢板及其制造方法 有权

屈服强度低、材质变化小的高强度热镀锌钢板及其制造方法
摘要：
一种低YP且材质变化小的高强度热镀锌钢板，其特征在于，以质量％计，含有C：0.01～0.12％、Si：0.2％以下、Mn：小于2％、P：0.04％以下、S：0.02％以下、sol.Al：0.3％以下、N：0.01％以下、Cr：大于0.3％且在2％以下，而且满足2.19＜([％Mn]+1.3×[％Cr])＜3及0.24≤[％Cr]/[％Mn]，余量由铁及不可避免的杂质构成，并且具有铁素体和面积率为2～25％的第2相，第2相中的珠光体或贝氏体的面积率小于20％，第2相的平均粒径为0.9～7μm，第2相的粒径小于0.8μm的粒子的面积率小于15％。[％Mn]、[％Cr]分别表示Mn、Cr的含量。
摘要（英）：

A high-strength cold rolled steel sheet of low YP with less material quality fluctuation, comprising, by mass, 0.01 to 0.12% C, 0.2% or less Si, less than 2% Mn, 0.04% or less P, 0.02% or less S, 0.3% or less sol. Al, 0.01% or less N and more than 0.3 to 2% Cr so that the relationships 2.19<([%Mn]+1.3OE%Cr))<3 and 0.24=[%Cr]/[%Mn] are satisfied ([%Mn] and [%Cr] represent the contents of Mn and Cr, respectively) and comprising the balance iron and unavoidable impurities, which steel sheet has ferrite and the second phase of 2 to 25% area ratio. In the second phase, the area ratio of pearlite or bainite is less than 20%, and the average grain diameter of the second phase is in the range of 0.9 to 7 [mu]m. In the second phase, the area ratio of grains of less than 0.8 [mu]m grain diameter isless than 15%.

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