Case carburized stainless steel alloy for high temperature appli

Details Case carburized stainless steel alloy for high temperature appli Case carburized stainless steel alloy for high temperature appli

1993-12-23

1995-06-13

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

148319, 148221, 148226, 148233, C21D 106, C22C 3844, C22C 3848

Patent

active

054240280

ABSTRACT:
A case carburizable stainless steel alloy intended to be used at operating temperatures up to 700.degree. F. The alloy is able to achieve and maintain a high surface hardness when carburized and heat treated and combines high fracture toughness, hot hardness, metal-to-metal wear resistance and corrosion resistance while retaining core ductility and strength. The alloy consists essentially of (in weight percent) 0.1 to 0.25% carbon, 0 to 1% silicon, 0 to 1% manganese, 13 to 19% chromium, 1.75 to 5.25% nickel, 3 to 5% molybdenum, 0.25 to 1.25% vanadium, 5 to 14% cobalt, 0.01 to 0.1% niobium; 0 to 0.02% boron; and the balance iron and incidental impurities. The alloy is particularly suited for use in bearing applications and also in cams, shafts, gears, bolts and like articles exposed to elevated temperatures and corrosive atmospheres.

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"Martensitic Stainless Steels", Stainless Steels And Heat-Resisting Alloys, pp. 630-633. Metals Handbook, 9th Ed. vol. 4, Nov., 1981.

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