DIE STEEL FOR COLD WORKING WITH SURFACE ROUGHENING RESISTANCE

摘要

PURPOSE:To obtain the titled steel having superior surface roughening resistance and machinability without deteriorating the characteristics such as wear resistance, toughness and fatigue resistance by restricting the composition of a steel contg. C, Si, Mn, Cr, Mo, V, etc. CONSTITUTION:This die steel for cold working with surface roughening resistance consists of, by weight, 0.60-0.78% C, 0.60-1.50% Si, =1.50% Mn, 0.80- 1.90% Cr, 0.55-1.50% Mo, 0.05-0.50% V and the balance Fe with impurity elements. The steel may further contain =1 kind among =0.30% Nb, =0.30% Ti and =0.30% Zr or =1 kind among =0.30% S, =0.30% Se, =0.30 Pb, =0.20% Te and =0.2% Ca. The C and Cr contents are reduced to such a degree that the wear resistance is not deteriorated, the amounts of carbide forming elements such as Cr and Mo are regulated, and said proper amount of V is added to make carbide grains fine, so superior surface roughening resistance and fouling resistance are provided.