Super hard high-speed tool steel

Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions

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75236, 75237, 75239, 75241, 75243, 75244, 75246, 419 38, 419 29, 420 10, 420 11, 420 12, 420 15, 420 27, C22C 2904

Patent

active

048804614

ABSTRACT:
A super hard high-speed tool steel having a composition satisfying the condition of 0.ltoreq.C-Ceq.ltoreq.0.6 (where Ceq=0.06Cr+0.033 W+0.063 Mo+0.2 V within the range of 1.7.ltoreq.C.ltoreq.4.1%, the composition containing 3 to 10% of Cr, 1 to 20% of W, 1 to 15% of Mo (where 18.ltoreq.W+2Mo.ltoreq.40), 1 to 15% of V, not greater than 15% of Co, not greater than 2% of Si, not greater than 1% of Mn, and the balance substantially Fe and inevitable impurities, the steel further containing in uniformly dispersed state 2 to 12% in total of one, two or more selected from a group consisting of nitrides, carbides and carbonitrides of Ti, V, Zr, Nb, Hf and Ta in the composition. This tool steel exhibits a distinguished hardness of HRC 71 or higher, as well as toughness.

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patent: 4599109 (1986-07-01), Kawai et al.

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