Patent ID: 8876936

Claim:
An engine valve seat, comprising: iron (Fe) as a main component; about 0.6˜1.2 wt % of carbon (C); about 1.0˜3.0 wt % of nickel (Ni); about 8.0˜11.0 wt % of cobalt (Co); about 3.0˜6.0 wt % of chromium (Cr); about 4.0˜7.0 wt % of molybdenum (Mo); about 0.5˜2.5 wt % of tungsten (W); about 1.0˜3.0 wt % of manganese (Mn); about 0.2˜1.0 wt % of calcium (Ca); and one or more impurities, wherein the engine valve seat further comprises one or more hard particles of 60 wt % cobalt (Co)-30 wt % molybdenum(Mo)-8 wt % chromium(Cr) alloy powder prepared by gas injection, and having a particle size of about 60 mesh or less.