| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a nitrided component, which can increase the depth of a nitrided region, simultaneously enhance the hardness of the nitrided region, and is less prone to cause a defect such as a crack even in a stress-concentrated zone such as the bottom of a recessed part. SOLUTION: This manufacturing method comprises the steps of: preparing a base metal of the component from a steel having a composition comprising, by mass%, 0.0050 to 0.20% C, 0.010 to 0.30% Si, 0.10 to 2.0% Mn, 0.10 to 1.5% Cr, 0.0050 to 0.025% N, 0.60 to 1.5% Ti and the balance Fe with impurity elements, while making a Ti content expressed by WTi (mass%), a C content expressed by WC (mass%), and a N content expressed by WN (mass%) satisfy the expression of 1.5≥WTi-4WC-3.4WN≥0.6; and nitriding the surface of the base metal of the component in a temperature range of 600 to 750°C. COPYRIGHT: (C)2008,JPO&INPIT
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