High-strength cold rolled steel sheet excelling in chemical treatability

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United States of America Patent

PATENT NO 8795442
APP PUB NO 20090014095A1
SERIAL NO

12162878

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The invention provides a high strength cold rolled steel sheet having excellent chemical conversion treatment property stably even Mo is added aiming high strengthening. The surface property of the cold rolled steel sheet satisfies that the characteristic of 10 μm or more of the maximum depth (Ry) of the unevenness and 30 μm or less of the average spacing (Sm) of the unevenness, and that either one or more preferably both of, the characteristic of the load length ratio (tp40) of the unevenness of the surface is 20% or less, and the characteristic of the difference of the load length ratios (tp60) and (tp40) is 60% or more, is satisfied, and the crack of 3 μm or less width and 5 μm or more depth does not exist on the surface.

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Patent Owner(s)

  • KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.);KOBE STEEL, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kozuma, Shinji Kakogawa, JP 7 81
Mukai, Yoichi Kakogawa, JP 24 331
Nomura, Masahiro Kobe, JP 99 1351

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