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:
Jan. 08, 2019
Filed:
Jul. 02, 2012
Jun Haga, Osaka, JP;
Takuya Nishio, Osaka, JP;
Masayuki Wakita, Osaka, JP;
Yasuaki Tanaka, Osaka, JP;
Norio Imai, Osaka, JP;
Toshiro Tomida, Osaka, JP;
Mitsuru Yoshida, Osaka, JP;
Kengo Hata, Osaka, JP;
Jun Haga, Osaka, JP;
Takuya Nishio, Osaka, JP;
Masayuki Wakita, Osaka, JP;
Yasuaki Tanaka, Osaka, JP;
Norio Imai, Osaka, JP;
Toshiro Tomida, Osaka, JP;
Mitsuru Yoshida, Osaka, JP;
Kengo Hata, Osaka, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A method for producing a high-tensile cold-rolled steel sheet includes subjecting a slab having a composition containing C: more than 0.020% and less than 0.30%, Si: more than 0.10% and 3.00% or less, and Mn: more than 1.00% and 3.50% or less to hot rolling wherein the roll draft of the final one pass is higher than 15%, and rolling is finished in the temperature region of Arpoint or higher, optionally annealing wherein the hot-rolled steel sheet is heated to 300° C. or higher after being cooled to 780° C. or lower, coiling higher than 400° C. or lower than 400° C., cold rolling the hot-rolled steel sheet or the annealed steel sheet, and annealing wherein the cold-rolled steel sheet is soaked in the temperature region of (Acpoint−40° C.) or higher, cooling to 500° C. or lower and 300° C. or higher, and holding in that temperature region for 30 seconds or longer.