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. 13, 2017
Filed:
Nov. 29, 2013
Jfe Steel Corporation, Tokyo, JP;
Minoru Tanaka, Fukuyama, JP;
Yoshitsugu Suzuki, Fukuyama, JP;
Mai Miyata, Fukuyama, JP;
Yasunobu Nagataki, Fukuyama, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A method for manufacturing a galvanized steel sheet includes heating a base steel sheet in a heating zone such that the surface of the base steel sheet is heated at a temperature of 600° C. or higher and 790° C. or lower while a furnace temperature T° C. in the heating zone of an annealing furnace is controlled based on the water vapor partial pressure Pof air fed into the heating zone, the base steel sheet having a chemical composition consisting of, by mass %, C: 0.05% or more and 0.25% or less, Si: 0.1% or more and 3.0% or less, Mn: 0.5% or more and 3.0% or less, P: 0.001% or more and 0.10% or less, Al: 0.01% or more and 3.00% or less, S: 0.200% or less, and the balance being Fe and inevitable impurities, heating the base steel sheet in the heating zone such that the surface of the base steel sheet is heated at a temperature of 630° C. or higher and 850° C. or lower in an atmosphere containing hydrogen gas having a partial pressure Pof 1000 Pa or more and 50000 Pa or less, water vapor gas having a partial pressure Pof 610 Pa or less, and the balance being Nand inevitable impurities, and galvanizing the base steel sheet.