Patent ID: 7749298

Claim:
An iron-based sintered alloy, comprising: carbides in a matrix comprising martensite, the carbides comprising: Cr 7 C 3 carbides; Mo 7 C 3 carbides; and M 7 C 3 carbides, wherein M represents one or more of members selected from the group consisting of group 4a or group 5a metals; wherein the carbides in the matrix have a composition comprising Cr: in an amount of 1 to 3.5 mass %; Mo: in an amount of 0.2 to 0.9 mass %; M: in an amount of 0.1 to 0.5 mass % when M is the group 5a metal V, and in an amount satisfying the following condition when M is a group 4a or group 5a metal other than V: ( Q m /a m )× a v =0.1 to 0.5 mass % wherein Q m is a mass % of M other than V, a m is an atomic weight of M other than V, and a v is an atomic weight of V; C: in an amount of 0.72 to 0.95 mass %; Mn: in an amount of 0.7 mass % or less; and a balance of Fe and impurities.