The hard grain for sintering alloy blendinging, being the hard grain which is blendinged as the raw materials in production manner and the valve seat null sintering alloy

摘要

PROBLEM TO BE SOLVED: To provide hard particles capable of improving the adhesion between the hard particles and a base metal and a wear resistant ferrous sintered alloy, to provide a method for producing the wear resistant ferrous sintered alloy and to provide a valve seat. ;SOLUTION: The hard particles are composed of, by mass, 20 to 70% Mo, 0.5 to 3% C, 5 to 40% Ni, 1 to 20% Mn, and the balance Fe with inevitable impurities. At least one kind among ≤40% Co, 0.1 to 10% Cr and ≤4% Si may be incorporated therein. The whole components of the sintered alloy are composed of, by mass, 4 to 30% Mo, 0.2 to 3% C, 1 to 20% Ni, 0.5 to 12% Mn, and the balance Fe with inevitable impurities, the base components are composed of 0.2 to 5% C, 0.1 to 12% Mn, and the balance Fe with inevitable impurities, the hard particle components are composed of 20 to 70% Mo, 0.5 to 3% C, 5 to 40% Ni, 1 to 20% Mn, and the balance Fe with inevitable impurities, and the hard particles are dispersed into the base by 10 to 60% in an area ratio.;COPYRIGHT: (C)2001,JPO