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:
Mar. 21, 2006
Filed:
Aug. 23, 2002
Satoshi Suzuki, Shin-Nanyo, JP;
Takashi Igawa, Shin-Nanyo, JP;
Hiroshi Fujimoto, Shin-Nanyo, JP;
Naoto Hiramatsu, Shin-Nanyo, JP;
Satoshi Suzuki, Shin-Nanyo, JP;
Takashi Igawa, Shin-Nanyo, JP;
Hiroshi Fujimoto, Shin-Nanyo, JP;
Naoto Hiramatsu, Shin-Nanyo, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Abstract
An austenitic stainless steel comprising (C+½N) up to 0.060 mass %, Si up to 1.0 mass %, Mn up to 5 mass %, S up to 0.003 mass %, S/Mn ratio up to 0.003, 15–20 mass % Cr, 5–12 mass % Ni, Cu up to 5 mass %, 0–3.0 mass % Mo and the balance being Fe except inevitable impurities under the condition that a value Md(representing a ratio of a strain-induced martensite) defined by the under-mentioned formula is controlled within a range of −60 to −10. Hardness increase of the steel sheet after being cold-rolled is preferably 20% or more as Vickers hardness. A metallurgical structure of the steel sheet is preferably adjusted to grain size number of #8 to #11 in a finish annealed state. The steel sheet is blanked with high dimensional accuracy, and a die life is also prolonged.Md=551−462(C+N)−9.2Si−29(Ni+Cu)−8.1Mn−13.7Cr−18.5Mo.