Patent ID: 7163593

Claim:
An iron-based alloy consisting of: 1.5 to 2.5 wt % of C; 0.25 to 4.75 wt % of Ni; W and V in quantities corresponding to a region surrounded by a line L as shown in FIG. 1 of attached drawings; 0.25 to 1.7 wt % of Mn, at least one of 0.3 wt % or less of Ti, 0.6 wt % or less of Nb, 10 wt % or less of Mo and 0.005 wt % or less of B; a balances of Fe; inevitable impurities; and an MC carbide included in a matrix comprising a martensitic phase and an austenitic phase, wherein the austentic phase is a low carbon content austenite phase.