High hardness and high toughness nitriding powder metallurgical high-speed steel

摘要

A high-speed steel obtained by powder metallurgy processing wherein a chemical composition includes, by weight %, C: a quantity (%) which satisfies with the following formula <IMAGE> where Ceq=0.19+0.017 (W+2Mo)+0.22 V N, W, Mo and V are respectively the content (%) in steel -Cr: 3-5% V: 6.0-8.5% -Mo: 4-7.5% Co: 5-15% -W: 5-7% N: 0.2-1.7% - and the remainder is Fe, and (W+2Mo) is 15-20% is disclosed.