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.
