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. 04, 2006
Filed:
Nov. 14, 2003
Satoshi Suzuki, Shunan, JP;
Hideki Tanaka, Shunan, JP;
Naoto Hiramatsu, Shunan, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Abstract
A ferritic or martensitic stainless steel has the structure that Cu-enriched particles with concentration of C not less than 0.1 mass % or concentration of Sn and/or In not less than 10 mass % were dispersed in a matrix. Precipitation and dispersion of Cu-enriched particles is realized by aging the stainless steel at 500–900° C. for 1 hour or longer on any stage after a hot-rolling step until a forming step to a final product. The ferritic stainless steel contains 0.01–1.0% C, Si up to 1.0%, Mn up to 1.0%, 15–30% Cr, Ni up to 6.0% and 0.5–6.0% Cu. The martensitic stainless steel contains 0.01–0.5% C, Si up to 1.0%, Mn up to 1.0%, 10–15% Cr, Ni up to 6.0% and 0.5–6.0% Cu. Since Cu-enriched particles are dispersed for improvement of machinability instead of addition of S, Pb, Bi or Se, the stainless steel is machined to an objective shape without any harmful influence on workability, corrosion-resistance and the environment.