Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Reexamination Certificate
2002-12-23
2009-08-11
Wyszomierski, George (Department: 1793)
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
C420S064000, C420S068000, C420S069000, C420S119000, C420S121000, C420S122000, C420S124000
Reexamination Certificate
active
07572407
ABSTRACT:
A martensitic stainless steel sheet having superior corrosion resistance, toughness at the weld zones, and workability. The composition of the steel sheet is, on a mass basis: less than about 0.02% of carbon; about 1.0% or less of silicon; less than about 1.5% of manganese; about 0.04% or less of phosphorus; about 0.01% or less of sulfur; about 0.1% or less of aluminum; about 1.5% or more and less than about 4.0% of nickel; about 11% or more and less than about 15% of chromium; about 0.5% or more and less than about 2.0% of molybdenum; and less than about 0.02% of nitrogen, the balance being iron and unavoidable impurities, wherein 15.0%≦[Cr]+1.5×[Mo]+1.2×[Ni]≦20.0%; [C]+[N]<0.030%; [Ni]+0.5×([Mn]+[Mo])+30×[C]>3.0%; and 8.0%≦72×[C]+40×[N]+3×[Si]+2×[Mn]+4×[Ni]+[Mo]≦18.0%.
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Furukimi Osamu
Hirasawa Junichiro
Ujiro Takumi
DLA Piper (LLP) US
JFE Steel Corporation
McGuthry-Banks Tima M
Wyszomierski George
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