PURPOSE: To obtain a control valve sliding member having high strength and excellent wear resistance, by integrally fusion-welding a sintered alloy which is made by sintering alloy powder contg. cast iron powder and in which a hard phase having specified grain size and hardness is uniformly dispersed in a specific area ratio, to an iron-type matrix.

CONSTITUTION: The sintered alloy is manufactured by sintering a green or presintered compact of the alloy powder contg. ≥10%, by weight, of ≥1 kind of cast iron powder. Meantime, the iron-type matrix has the hard phase having 1W5μ average grain size and Hv 600W1800 hardness and being uniformly dispersed in the matrix at 5W80% area ratio. The sintered alloy is integrally fusion-welded to the iron-type matrix to form the valve sliding member.