CARBURIZED COMPONENT OR CARBONITRIDED COMPONENT MADE OF STEEL AND SUBJECTED TO SHOT PEENING

摘要

PROBLEM TO BE SOLVED: To provide a carburized component or a carbonitrided component made of steel and subjected to shot peening which has satisfactory facial fatigue strength and can response to requests for lightening, miniaturization and high stress loading.;SOLUTION: Regarding the carburized component or a carbonitrided component made of steel and subjected to shot peening, the base is made of steel having chemical components comprising, by mass, 0.1 to 0.3% C, 0.05 to 1.5% Si, 0.2 to 1.5% Mn, 0.003 to 0.05% S, 0.5 to 3.0% Cr, 0.01 to 0.05% Al and 0.008 to 0.025% N, and the balance Fe with impurities, and in which the hardness of the surface layer part is ≥850 by Vickers hardness, the depth of the hardened layer defined by a distance from the surface to a position having a Vickers hardness of 700 is 0.6 to 1.0 mm, and the volume fraction of lens-shaped martensite occupied in the region to a depth of 0.1 mm from the surface is ≤3%.;COPYRIGHT: (C)2009,JPO&INPIT