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.:
Date of Patent:
Dec. 16, 2014
Filed:
Mar. 28, 2011
Shinji Ootsuka, Fukuyama, JP;
Junichiro Hirasawa, Chiba, JP;
Hideyuki Takahashi, Fukuyama, JP;
Naoto Yoshimi, Kawasaki, JP;
Hideki Nagano, Fukuyama, JP;
Shinji Ootsuka, Fukuyama, JP;
Junichiro Hirasawa, Chiba, JP;
Hideyuki Takahashi, Fukuyama, JP;
Naoto Yoshimi, Kawasaki, JP;
Hideki Nagano, Fukuyama, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A method for manufacturing high-Si cold rolled steel sheets includes heating a cold rolled steel sheet with a direct flame burner (A) having an air ratio of not more than 0.89 when the temperature of the cold rolled steel sheet that is being increased is in the temperature range of not less than 300° C. and less than Ta° C., subsequently heating the cold rolled steel sheet with a direct flame burner (B) having an air ratio of not less than 0.95 when the temperature of the cold rolled steel sheet is in the temperature range of not less than Ta° C. and less than Tb° C., and subsequently soak-annealing the cold rolled steel sheet in a furnace having an atmospheric gas composition which has a dew point of not more than −25° C. and contains 1 to 10 volume % of Hand the balance of N.