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, 2007
Filed:
Apr. 01, 2005
Yoshiharu Inoue, Futtsu, JP;
Masao Kikuchi, Futtsu, JP;
Haruhiko Kajimura, Tokyo, JP;
Nobuhiko Hiraide, Tokyo, JP;
Yasuhisa Tanaka, Toyota, JP;
Yosuke Sumi, Toyota, JP;
Yoshiharu Inoue, Futtsu, JP;
Masao Kikuchi, Futtsu, JP;
Haruhiko Kajimura, Tokyo, JP;
Nobuhiko Hiraide, Tokyo, JP;
Yasuhisa Tanaka, Toyota, JP;
Yosuke Sumi, Toyota, JP;
Nippon Steel & Sumikin Stainless Steel Corporation, Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-Ken, JP;
Abstract
A ferrite stainless steel for an automobile exhaust system member superior in thermal fatigue strength comprised of, by wt %, C: 0.020% or less, Si: 0.02 to 0.15%, Mn: 0.05 to 0.20%, P: 0.040% or less, S: 0.010% or less, Al: 0.005 to 0.10%, N: 0.020% or less, Cr: 15 to 18%, Mo: 1.5 to 2.0%, Ti: 3×(C+N) to 0.25%, Nb: 0.4 to 0.8%, B: 0.0003 to 0.0050%, the C and N satisfying the relationship of C+N: 0.030% or less, and the Al, Si, and Mn satisfying the relationship of Al×(Si+Mn): 0.001 to 0.020, and a balance of Fe and unavoidable impurities. The 0.2% proof stress at 900° C. before heat treatment in the atmosphere at 900° C. for 300 hours is at least 15 MPa, and a difference of the 0.2% proof stress before and after the heat treatment is not more than 5 MPa.