POWDERED HIGH-SPEED STEEL CONTAINING NITROGEN

摘要

PURPOSE:To obtain a powdered high-speed steel contg. nitrogen and having high strength, toughness, wear resistance an seizing resistance by regulating the relation between the amounts of C and N and adding specified amounts of Cr, W, V and Mo. CONSTITUTION:This powdered high-speed steel contg. nitrogen contains C by an amount satisfying an equation Ceq+0.15=C+12/14N=Ceq+0.35 [where Ceq= 0.19+0.017(W+2Mo)+0.22V], 3-5% Cr, 4-7% Mo, 5-7% W (W+2Mo=15- 20%), 3.2-3.8% V and =0.2% N. When the content of each element in the high-speed steel is set, the C content is related to the amounts of carbide forming elements, especially Mo, W and V to be blended, and the amounts of C and N are related to each other, so superior characteristics such as high toughness, wear resistance and seizing resistance capable of withstanding severe conditions are provided.