HIGH HARDENABILITY AND HIGH HARDNESS POWDER HIGH SPEED STEEL

摘要

PROBLEM TO BE SOLVED: To produce a high speed steel excellent in hardenability and having high hardness. ;SOLUTION: This high hardenability powder high speed steel is composed of alloy powder having a chemical compsn. contg., by mass, 1.2 to 2.5% C, 0.10 to 0.50% Si, 0.10 to 0.50% Mn, 4.5 to 5.5% Cr, 3.0 to 8.0% Mo, 3.0 to 15.0% W, 2.0 to 6.0% V, 5.0 to 9.5% Co, and the balance Fe with inevitable impurities, and in the case Weq=W+2Mo, Weq is regulated to 15 to 30% by mass. Otherwise, it is formed of alloy powder furthermore contg. 0.0050 to 0.0400% B and 0.0100 to 0.0400% Ti and satisfying Bef=B-0.77×(N-Ti/3.42)0 and whose hardness after quenching and tempering is regulated to ∞68 HRC.;COPYRIGHT: (C)1997,JPO