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. 30, 2014
Filed:
Sep. 30, 2009
Yoshiaki Natori, Tokyo, JP;
Shuichi Yamazaki, Tokyo, JP;
Fumiaki Takahashi, Tokyo, JP;
Seiki Takebayashi, Tokyo, JP;
Yoshiaki Natori, Tokyo, JP;
Shuichi Yamazaki, Tokyo, JP;
Fumiaki Takahashi, Tokyo, JP;
Seiki Takebayashi, Tokyo, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
Nitriding process of a steel strip is performed. Next, annealing is performed to form a forsterite based glass coating film at a surface of the steel strip. Heating is performed up to 1000° C. or more in a mixed gas atmosphere containing Hgas and Ngas, and a rate of Ngas is 20 volume % or more, next, the atmosphere is switched into Hgas atmosphere at the temperature of 1000° C. or more and 1100° C. or less, when the annealing is performed. An oxygen potential P (HO)/P (H) is set to be 0.05 to 0.3 when the temperature is 850° C. or less during the heating in the mixed gas atmosphere.