Metal treatment – Stock – Ferrous
Reexamination Certificate
2006-03-21
2006-03-21
Ip, Sikyin (Department: 1742)
Metal treatment
Stock
Ferrous
C148S326000, C148S327000
Reexamination Certificate
active
07014719
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 Md30(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.in-line-formulae description="In-line Formulae" end="lead"?Md30=551−462(C+N)−9.2Si−29(Ni+Cu)−8.1Mn−13.7Cr−18.5Mo.in-line-formulae description="In-line Formulae" end="tail"?
REFERENCES:
patent: (1996) 08-109447 (1996-04-01), None
patent: 08109447 (1996-04-01), None
patent: (1996) 08-260111 (1996-10-01), None
patent: 08260111 (1996-10-01), None
patent: 9507792 (1995-07-01), None
Fujimoto Hiroshi
Hiramatsu Naoto
Igawa Takashi
Suzuki Satoshi
Ip Sikyin
Nisshin Steel Co. Ltd.
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