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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 8986468 B1

PDFFull Text
Date of Patent:
Mar. 24, 2015

Filed:

Mar. 23, 2006

High-strength cold-rolled steel sheet excellent in coating adhesion, workability and hydrogen embrittlement resistance, and steel component for automobile

Applicants:

Masaaki Miura, Kakogawa, JP;

Shinji Kozuma, Kakogawa, JP;

Yoichi Mukai, Kakogawa, JP;

Yoshinobu Omiya, Kakogawa, JP;

Inventors:

Masaaki Miura, Kakogawa, JP;

Shinji Kozuma, Kakogawa, JP;

Yoichi Mukai, Kakogawa, JP;

Yoshinobu Omiya, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Kaj K Olsen

Assistant Examiner:

Alexander Polyansky

Int. Cl.
CPC ...
C22C 38/00 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C21D 9/48 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01);
U.S. Cl.
CPC ...
C22C 38/02 (2013.01); C21D 8/0468 (2013.01); C21D 9/46 (2013.01); C21D 9/48 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

A cold rolled steel sheet satisfying on the basis of percent by mass the chemical composition of 0.06-0.6% C, 0.1-2% Si, 0.01-3% Al, 1-4% Si+Al, 1-6% Mn, Si/Mn≦0.40, in which there exists 10 or more pieces/100 μmof Mn—Si composite oxide having Mn—Si atom ratio (Mn/Si) of 0.5 or over and major axis of from 0.01 μm to 5 μm and also having a covering ratio of 10% or below at which the surface of the steel sheet is covered with oxide containing Si as the main component.

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