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:
Dec. 04, 2018
Filed:
Feb. 01, 2013
Applicant:
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Inventors:
Hirofumi Onishi, Tokyo, JP;
Akihiro Yamanaka, Tokyo, JP;
Hideo Mizukami, Tokyo, JP;
Tomoaki Sera, Tokyo, JP;
Hideyoshi Yamaguchi, Tokyo, JP;
Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/00 (2006.01); B22D 7/00 (2006.01); B22D 23/10 (2006.01); C22C 38/22 (2006.01); C22C 38/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C22B 9/18 (2006.01); C21D 9/38 (2006.01); B21J 1/02 (2006.01); B21K 1/02 (2006.01); C21D 7/13 (2006.01);
U.S. Cl.
CPC ...
B22D 7/00 (2013.01); B21J 1/025 (2013.01); B21K 1/02 (2013.01); B22D 23/10 (2013.01); C21D 9/38 (2013.01); C22B 9/18 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C21D 7/13 (2013.01); Y10T 29/49988 (2015.01);
Abstract
A method for manufacturing a forged steel roll comprises: casting, by the ESR method, a steel ingot which contains, by mass %, C: 0.3% or more, Si: 0.2% or more, Cr: 2.0-13.0% and Mo: 0.2% or more, and further contains Bi at 10-100 ppm by mass; and forging the steel ingot to manufacture the roll. According to this method, since freckle defects can be sealed near the center of the steel ingot, the roll can be stably used over a long period of time.