PURPOSE:To obtain the titled tool steel combining super hardness with superior machining durability by means of ordinary quench-and-temper even if content of alloying elements and hard material mentioned below is reduced, by uniformly dispersing a specific amount of hard material such as TiN, etc., into a high- speed tool steel matrix in which content of alloying elements such as W, Mo, V, etc., is limited. CONSTITUTION:A powder of high-speed tool steel having a composition satisfying 0=C-Ceq=0.6 when Ceq=0.06Cr+0.033W+0.063Mo+0.2V and C=2.25-4.1% and further containing 3-10% Cr, 1-20% W, 1-15% Mo, 1-15% V, =15% Co, =2% Si, and =1% Mn and having the balance Fe with impurities is prepared, where 24.1=W+2Mo=40. Subsequently, one or more kinds among nitrides, carbides, and carbonitrides of Ti, V, Zr, Nb, Hf, and Ta are mixed with the above powder by 2-12% in total, and then above-mentioned hard material is uniformly dispersed into the above tool steel matrix by means of compacting-sintering, etc., so that the titled steel can be obtained.
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