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. 31, 2013
Filed:
Sep. 13, 2012
Kiyokazu Ishizuka, Hyogo, JP;
Kazumi Nishimura, Hyogo, JP;
Ikuo Kikuchi, Hyogo, JP;
Kaoru Kawasaki, Hyogo, JP;
Junji Haji, Hyogo, JP;
Kiyokazu Ishizuka, Hyogo, JP;
Kazumi Nishimura, Hyogo, JP;
Ikuo Kikuchi, Hyogo, JP;
Kaoru Kawasaki, Hyogo, JP;
Junji Haji, Hyogo, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.