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:
Nov. 01, 2011
Filed:
Feb. 15, 2008
Katsuhiro Sasai, Futtsu, JP;
Wataru Ohashi, Futtsu, JP;
Tooru Matsumiya, Futtsu, JP;
Yoshiaki Kimura, Kimitsu, JP;
Junji Nakashima, Kimitsu, JP;
Katsuhiro Sasai, Futtsu, JP;
Wataru Ohashi, Futtsu, JP;
Tooru Matsumiya, Futtsu, JP;
Yoshiaki Kimura, Kimitsu, JP;
Junji Nakashima, Kimitsu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab, and a process for producing the steel sheet and slab. The present invention provides a process comprising the steps of decarburizing a molten steel so as to produce a carbon concentration of up to 0.01% by mass, pre-deoxidizing the molten steel by adding Al thereto so as to produce a dissolved oxygen concentration from 0.01 to 0.04% by mass, adding thereto Ti and at least La and/or Ce, and casting the molten steel, and a steel sheet and a steel slab obtained by the process.