ALLOY TOOL STEEL EXCELLENT IN WEAR RESISTANCE, CORROSION RESISTANCE AND TOUGHNESS

摘要

PURPOSE:To develop and alloy tool steel combining high hardness and wear resistance with corrosion resistance and toughness by adding Cu and Co in combination and by increasing V content in a conventional alloy tool steel. CONSTITUTION:As alloy tool steel, an alloy steel having a composition containing, by weight, 0.8-1.25% C, 0.8% Si, 0.8% Mn, 6.0-10.0% Cr, 0.5-3.0% Mo, 0.5-4.0% V, 0.1-4.0% Co and 2% Cu or further containing 2.5% Ni is used. In the above alloy tool steel, acid resistance is improved by the combined addition of Cr and Co and, if necessary, by the addition of Ni, toughness is improved by reducing the amounts of C and Cr as compared with conventional alloy tool steels to refine primary carbides and wear resistance is also improved by increasing V content to increase the proportion of VC carbides.