Wear resistant alloy containing residual austenite for valve...

Alloys or metallic compositions – Ferrous – 1.7 percent or more carbon containing

Reexamination Certificate

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C420S012000, C420S017000, C420S097000, C420S098000, C420S108000, C420S110000, C420S586100, C148S321000, C148S324000, C148S442000, C075S246000

Reexamination Certificate

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06916444

ABSTRACT:
This invention related to a novel iron base alloy using residual austenite to improve wear resistance for valve seat insert material for internal combustion engines. The residual austenite is stable even after heat treatment and liquid nitrogen chilling. The alloy comprises of 2.0-4.0 wt % carbon, 1.0-3.0 wt % silicon, 0-4.0 wt % manganese, 3.0-9.0 wt % chromium, 5.0-15.0 wt % molybdenum, 3.0-15.0 wt % nickel, 0-6.0 wt % vanadium, 0-4.0 wt % niobium, 0-6.0 wt % cobalt, and the balance being iron with impurities.

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