Patent ID: 7611590

Claim:
A martensitic wear resistant iron base alloy with excellent hot hardness and wear resistance comprising: a) about 2.05 to about 3.60 wt % carbon; b) about 3.0 to about 10.0 wt % chromium; c) about 0.1 to about 3.0 wt % silicon; d) about 0 to about 8.0 wt % cobalt; e) about 11.0 to about 25.0 wt % of molybdenum; f) about 0.1 to about 6.5 wt % nickel; g) about 0.0 to about 8.0 wt % vanadium; h) about 0.0 to about 6.0 wt % niobium; i) about 0 to about 2.0 wt % manganese; j) less than 0.5 wt % aluminum; and k) the balance being iron and impurities, l) wherein i) the alloy has been tempered from an as-cast condition so that substantially all residual austenite is changed to martensite, ii) the alloy contains alloy carbides embedded in a matrix of tempered martensite, the alloy carbides consisting essentially of carbides formed during solidification from casting a melt of the alloy composition, and; iii) the alloy is capable of having, after being heat treated at a temperature of 1200° F. for one hour and then liquid nitrogen chilled, a hot hardness ratio, defined as hot hardness at 800° F. divided by room temperature hardness, of at least 0.8219.