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:
Feb. 18, 1992
Filed:
Sep. 21, 1989
Applicant:
Inventors:
Susumu Okada, Chiba, JP;
Makoto Imanaka, Chiba, JP;
Susumu Masui, Chiba, JP;
Takashi Obara, Chiba, JP;
Masatoshi Shinozaki, Chiba, JP;
Kozo Tsunoyama, Chiba, JP;
Assignee:
Kawasaki Steel Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C / ; C22C / ; C22C / ;
U.S. Cl.
CPC ...
148328 ; 148330 ;
Abstract
An extra-low carbon cold rolled steel sheet useful for use in automobiles and the like, having an improved spot weldability is obtained by combining and adding Ti, Nb and B in predetermined amounts to an extra-low carbon steel to control the amount of fine Ti precipitate dispersed in steel to within a specified reasonable range. Furthermore, the spot weldability is improved by controlling the production conditions of the extra-low carbon steel sheet to within specified reasonable ranges.