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:
Jul. 13, 2010
Filed:
Apr. 30, 2007
Applicants:
Shiho Fukumoto, Yasugi, JP;
Keiji Inoue, Yasugi, JP;
Inventors:
Shiho Fukumoto, Yasugi, JP;
Keiji Inoue, Yasugi, JP;
Assignee:
Hitachi Metals, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 8/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A high speed tool steel, which is high in impact value and free from variations in tool performance, comprising, by mass %, of: 0.4≦C≧0.9; Si≦1.0; Mn≦1.0; 4≦Cr≧6; 1.6-6 in total of either or both of W and Mo in the form of (½W+Mo) wherein W≦3; 0.5-3 in total of either or both of V and Nb in the form of (V+Nb); wherein carbides dispersed in the matrix of the tool steel have an average grain size of ≦0.5 μm and a dispersion density of particles of the carbides is of ≧80×10particles/mm.