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发明授权
US09011615B2 Bake hardening steel with excellent surface properties and resistance to secondary work embrittlement, and preparation method thereof 有权
具有优异的表面性能和耐二次加工脆化性的烘烤硬化钢及其制备方法

Bake hardening steel with excellent surface properties and resistance to secondary work embrittlement, and preparation method thereof
摘要：
Provided are a bake hardening steel having a crystalline grain size of ASTM No. 9 or more and a method for preparing the bake hardening steel by controlling the winding, rolling and cooling conditions. The bake hardening steel includes: C:0.0016˜0.0025%, Si:0.02% or less, P:0.01˜0.05%, S:0.01% or less, sol.Al:0.08˜0.12%, N:0.0025% or less, Ti:0.003% or less, Nb:0.003˜0.011%, Mo:0.01˜0.1%, B:0.0005˜0.0015% or less, balance Fe and other inevitable impurities, wherein % is weight %, and Mn and P satisfy the relation of −30(° C.)≧803P−24.4Mn−58.
摘要（中）：

提供具有ASTM 9号以上的结晶粒径的烘烤硬化钢和通过控制卷绕，轧制和冷却条件来制备烘烤硬化钢的方法。 烘烤硬化钢包括：C：0.0016〜0.0025％，Si：0.02％以下，P：0.01〜0.05％，S：0.01％以下，sol.Al:0.08〜0.12％，N：0.0025％以下， Ti：0.003％以下，Nb：0.003〜0.011％，Mo：0.01〜0.1％，B：0.0005〜0.0015％以下，余量为Fe等不可避免的杂质，其中，％为重量％，Mn和P满足关系式 -30（℃）≧803P-24.4Mn-58。

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