MACHINE-STRUCTURAL CARBON STEEL EXCELLENT IN MACHINABILITY AND COLD FORGEABILITY

摘要

PURPOSE: To make superior machinability and excellent cold forgeability compatible by shortening graphitization time and micronizing graphite grains after graphitization. ;CONSTITUTION: This carbon steel has a composition consisting of, by mass, 0.1-1.5% C, 0.5% Si, 0.1-2.0% Mn, 0.05-0.5% V, 0.0015-0.0150% N, ≤0.0030% O, at least one kind selected from 0.1-3.0% Ni, 0.1-3.0% Cu, and 0.1-3.0% Co, and the balance essentially Fe and further containing, if necessary, prescrived amounts of Cr, Mo, Nb, Al, Pb, Te, P, Ca, Bi, Se, and S. Moreover, this carbon steel has a metallic structure composed essentially of ferrite and graphite.;COPYRIGHT: (C)1995,JPO