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1. (WO2007114261) HIGH-STRENGTH COLD ROLLED STEEL SHEET EXCELLING IN CHEMICAL TREATABILITY

Pub. No.:    WO/2007/114261    International Application No.:    PCT/JP2007/056887
Publication Date: Fri Oct 12 01:59:59 CEST 2007 International Filing Date: Fri Mar 30 01:59:59 CEST 2007
IPC: C22C 38/00
C22C 38/06
C22C 38/58
C21D 9/46
Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO
株式会社神戸製鋼所
MUKAI, Yoichi
向井 陽一
KOZUMA, Shinji
上妻 伸二
NOMURA, Masahiro
野村 正裕
Inventors: MUKAI, Yoichi
向井 陽一
KOZUMA, Shinji
上妻 伸二
NOMURA, Masahiro
野村 正裕
Title: HIGH-STRENGTH COLD ROLLED STEEL SHEET EXCELLING IN CHEMICAL TREATABILITY
Abstract:
A high-strength cold rolled steel sheet that even when doped with Mo in order to attain a strength increase, exhibits stable excellent chemical treatability. With respect to the surface properties of the cold rolled steel sheet, there is satisfied the characteristic that not only is the maximum depth of unevenness (Ry) 10 μm or more but also the average spacing of the unevenness (Sm) is 30 μm or less. Further, there is satisfied either the characteristic that the load length ratio of surface unevenness (tp40) is 20% or below, or the characteristic that the difference between mentioned load length ratios (tp60) and (tp40) is 60% or above; preferably, there are satisfied both the characteristics. Still further, the surface has no cracks of 3 μm or less width and 5 μm or more depth.