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:
Sep. 11, 2001
Filed:
Aug. 31, 1999
Applicant:
Inventors:
Toshihiro Hanamura, Ibaraki, JP;
Hiroshi Nakajima, Ibaraki, JP;
Shiro Torizuka, Ibaraki, JP;
Kaneaki Tsuzaki, Ibaraki, JP;
Kotobu Nagai, Ibaraki, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 8/00 ; C22C 3/800 ;
U.S. Cl.
CPC ...
C21D 8/00 ; C22C 3/800 ;
Abstract
A high strength phosphorus-containing steel having fine texture free from the problem of embrittlement by positively using the presence of P, which is a carbon steel having an average ferritic grain diameter of 3 &mgr;m or less and containing from 0.04 to 0.1% by mass of P, wherein the volume fraction of P segregated in the grain boundary accounts for 0.3 or less in case the grain boundary is covered by a P layer 1 nm in thickness.