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:
Aug. 25, 2020
Filed:
Jun. 05, 2015
Jfe Steel Corporation, Chiyoda-ku, Tokyo, JP;
Gentaro Takeda, Tokyo, JP;
Masaru Miyake, Tokyo, JP;
Yoichi Makimizu, Tokyo, JP;
Yoshitsugu Suzuki, Tokyo, JP;
Yoshikazu Suzuki, Tokyo, JP;
JFE STEEL CORPORATION, Chiyoda-ku, Tokyo, JP;
Abstract
A method of producing a galvannealed steel sheet includes: annealing a steel strip by conveying the steel strip through a heating zone including a direct fired furnace, a soaking zone, and a cooling zone in this order in an annealing furnace; hot-dip galvanizing the steel strip discharged from the cooling zone; and heat-alloying a galvanized coating formed on the steel strip. Mixed gas of humidified gas and dry gas is supplied into the soaking zone from at least one gas supply port located in a region of lower ½ of the soaking zone in a height direction so that a dew point measured in a region of upper ⅕ of the soaking zone in the height direction and a dew point measured in a region of lower ⅕ of the soaking zone in the height direction are both 20° C. or more and 0° C. or less.