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:
Jun. 02, 2015
Filed:
Jul. 23, 2010
Tamotsu Toki, Nishinomiya, JP;
Atsushi Tomizawa, Minou, JP;
Nobusato Kojima, Amagasaki, JP;
Kazuya Ishii, Nishinomiya, JP;
Kazuhito Imai, Amagasaki, JP;
Toyomitsu Nakamura, Amagasaki, JP;
Naoaki Shimada, Osaka, JP;
Tamotsu Toki, Nishinomiya, JP;
Atsushi Tomizawa, Minou, JP;
Nobusato Kojima, Amagasaki, JP;
Kazuya Ishii, Nishinomiya, JP;
Kazuhito Imai, Amagasaki, JP;
Toyomitsu Nakamura, Amagasaki, JP;
Naoaki Shimada, Osaka, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A heat treated galvannealed steel material having excellent post-painting corrosion resistance and a high strength which is suitable for use as an automotive part and a method for its manufacture are provided. A galvannealed steel material having a galvannealed coating on at least one side thereof is heat treated by heating at least a portion thereof to a temperature range in which hardening is possible. The coating remaining on the surface of at least a part of the portion which underwent heat treatment has a coating weight of at least 20 g/mand at most 80 g/mper side and an Fe content of at least 15% and at most 35%, an η phase is present in the coating, and the centerline average roughness Ra of the surface of the coating is at most 1.5 μm.