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. 09, 2001
Filed:
Jul. 16, 1998
Applicant:
Inventors:
Yoshimasa Funakawa, Fukuyama, JP;
Toru Inazumi, Fukuyama, JP;
Hiroshi Sawada, Kasaoka, JP;
Naoki Matsui, Fukuyama, JP;
Jun Taniai, Fukuyama, JP;
Kenichi Mitsuzuka, Fukuyama, JP;
Assignee:
NKK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C22C 3/806 ; C22C 3/804 ; C21D 8/02 ;
U.S. Cl.
CPC ...
C22C 3/806 ; C22C 3/804 ; C21D 8/02 ;
Abstract
A soft cold-rolled steel sheet contains: 0.06 wt. % or less C, 0.1 wt. % or less Si, 0.5 wt. % or less Mn, 0.03 wt. % or less P, 0.03 wt. % or less S, 0.006 wt. % or less N, 0.009 wt. % or less B and the balance being Fe. The method comprises the steps of: continuously casting a steel to produce a slab; hot-rolling the slab to form a hot-rolled steel sheet; cold-rolling the hot-rolled steel sheet to produce a cold-rolled steel sheet; and continuously annealing the cold-rolled steel sheet.