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:
Oct. 31, 2006
Filed:
Jan. 30, 2002
Toshiaki Horiuchi, Ibaraki, JP;
Masaaki Igarashi, Osaka, JP;
Fujio Abe, Ibaraki, JP;
National Institute for Materials Science, Ibaraki, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a martensitic heat resistant alloy having a composition (A) comprising, % by weight: 0.03 to 0.15% of C; 0.01 to 0.9% of Si: 0.01 to 1.5% of Mn; 8.0 to 13.0% of Cr; 0.0005 to 0.015% of Al; no more than 2.0% of Mo; no more than 4.0% of W; 0.05 to 0.5% of V; 0.01 to 0.2% of Nb; 0.1 to 5.0% of Co; 0.008 to 0.03% of B; less than 0.005% of N: and Fe and inevitable impurities as the remainder, wherein (B) the contents (% by weight) of Mo, W, B and N satisfy the following formulae (1) and (2).B−0.772N>0.007  (1)W+1.916Mo−16.99B>2.0  (2) The martensitic heat resistant alloy of the present invention has excellent oxidation resistance, hot workability and ductility and exhibits high creep rupture strength in a range of relatively long rupture time at a high temperature.