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2. 发明公开

EP2236638A1 High-strength cold-rolled steel sheet excellent in workability and shape freezing property 失效
标题翻译： Hochfestes kaltgepresstes Stahlblech mit ausgezeichneterBearbeitungsfähigkeitund Formgefriereigenschaften
公开(公告)号：EP2236638A1
公开(公告)日：2010-10-06
申请号：EP10158525.5
申请日：2010-03-30
申请人： Kabushiki Kaisha Kobe Seiko Sho
发明人： Tsunezawa, Michitaka , Futamura, Yuichi , Miura, Masaaki
IPC分类号： C22C38/00
CPC分类号： C22C38/00 , Y10T428/12799 , Y10T428/12972
摘要： A high-strength cold-rolled steel sheet according to the present invention: satisfies the requirement of a prescribed chemical composition; has a structure comprising a mother phase structure of ferrite and a second phase structure of retained austenite and martensite (the martensite may not be included); and satisfies the following expressions (1) and (2) when the volume fraction of the ferrite in the whole structure is represented by Vf (%), the volume fraction of the retained austenite in the whole structure is represented by Vy (%), the carbon content in the retained austenite is represented by Cγ (mass %), the shortest distance between the second phase structures is represented by dis (µm), and the average grain size of the second phase structures is represented by dia (µm), Vf × Vγ × Cγ × dis / dia ≥ 300 dis ≥ 1.0 μm
By such a configuration, the improvement of TS-EL balance and the reduction of a springback value are attained in a high strength region of about 550 to 900 MPa class and excellent workability and shape freezing property are obtained.
摘要翻译：本发明的高强度冷轧钢板满足规定的化学成分的要求，具有包含铁素体的母相结构和残留奥氏体和马氏体的第二相结构（可以不包括马氏体）的结构; 满足下列表达式（1）和（2）当整个结构中铁素体的体积分数用Vf（％）表示时，整个结构中的残留奥氏体的体积分数由Vy（％）表示，残留奥氏体中的碳含量以C 3（质量％）表示，第二相结构之间的最短距离由dis（μm）表示，第二相结构的平均粒径由dia（μm）表示， Vf×V 3×C 3×dis / dia‰¥300‰¥1.0¼m通过这样的结构，在约550〜900MPa级的高强度区域中获得TS-EL平衡的改善和回弹值的降低得到优异的加工性和形状冷冻性。

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