HIGH HARDNESS STEEL FOR INDUCTION HARDENING EXCELLENT IN MACHINABILITY AND CORROSION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a high hardness steel good in corrosion resistance and cold workability, capable of obtaining hardness of ≥55 HRC by induction hardening and having excellent machinability. ;SOLUTION: This steel is the one having a compsn. contg., by mass, 0.30 to 0.60% C, ≤0.25% Si, ≤1.0% Mn, 0.005 to 0.2% S, 4.0 to 11.0% Cr, 0.001 to 0.1% Al, 0.0005 to 0.02% Ca, 0.0005 to 0.01% O, and the balance substantial Fe and contg. sulfides of ≥5 μm diameter equivalent to a circle contg. 0.1 to 10% Ca by ≥5 pieces per 3.3 mm2. For covering its corrosion resistance, for refining the crystal grains of Mo and N, and for improving its machinability, Pb, Bi, Se and The can be contained therein.;COPYRIGHT: (C)2000,JPO