POWDER METALLURGIC HIGH SPEED STEEL

摘要

PURPOSE: A powder metallurgic high speed steel is provided, to improve the high temperature hardness and the wearing resistance and to make the size of vanadium or niobium carbides contained in the structure be 1 micrometer or less. CONSTITUTION: The composition of powder metallurgic high speed steel comprises 1.5-2.5 wt% of C; 3-5 wt% of Cr; 5-7 wt% of W; 3-6 wt% of Mo; 4-6 wt% of Co; 4-6 wt% of V; 1-3 wt% of Nb; 1 wt% of Si or less; 0.6 wt% of Mn or less; and the balance of Fe and inevitable impurities, wherein the content of W+2Mo is 13 wt% or more and the content of Nb+V is 6 wt% or more. The powder metallurgic high speed steel is prepared by canning, high temperature isobaric forming, hot rolling, and heat treating of the composition.