STEEL MATERIAL FOR HIGH STRENGTH CONSTANT VELOCITY JOINT INTERMEDIATE SHAFT AND HIGH STRENGTH CONSTANT VELOCITY JOINT INTERMEDIATE SHAFT

摘要

PPROBLEM TO BE SOLVED: To provide a steel material for high strength constant velocity joint intermediate shaft and a high strength constant velocity joint intermediate shaft. PSOLUTION: This steel material contains 0.46-0.52% C, 0.6-0.8% Si, 0.7-0.9% Mn, 0.01-0.05% S, 0.3-0.5% Mo, 0.0005-0.005% B, 0.002-0.05% Al, 0.02-0.09% Ti and restricts N to 0.007%, Cr to 0.15%, P to 0.02%, respectively, and has 40% structural percentage of bainite+ martensite and 250-340HV hardness. This shaft made of this steel material has a spline vanishing part with a surface hardness of 610-750HV and a ratio (t/r) of an effective hardened layer depth (t) and radius (r) of 0.35-0.55, and has flat part with a surface hardness of 630-770HV and a ratio (t/r) of the effective hardness layer depth (t) and the radius (r) of 0.55-1.0, and has core hardness of 250-340HV. PCOPYRIGHT: (C)2006,JPO&NCIPI