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. 22, 2013
Filed:
Jan. 31, 2008
Applicants:
Akihide Nagao, Tokyo, JP;
Kenji Oi, Tokyo, JP;
Kenji Hayashi, Tokyo, JP;
Nobuo Shikanai, Tokyo, JP;
Inventors:
Assignee:
JFE Steel Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01); C22C 38/44 (2006.01);
U.S. Cl.
CPC ...
Abstract
High tensile strength steels that have both favorable delayed fracture resistance and a tensile strength of 600 MPa or higher and are suitably used in construction machinery, tanks, penstocks, and pipelines, as well as methods for manufacturing such steels are provided. The safety index of delayed fracture resistance (%) is 100×(X/X), where X: reduction of area of a specimen substantially free from diffusible hydrogen, and X: reduction of area of a specimen containing diffusible hydrogen.