| 摘要 |
<P>PROBLEM TO BE SOLVED: To manufacture a carburized component having excellent impact strength and bending strength that can not be expected until now by applying a vacuum-carburization-quenching and repeating direct-quenching one or more times to make crystal grains fine. Ž<P>SOLUTION: A steel containing, by mass, 0.10-0.45% C, 0.05-2.0% Si, 0.10-2.0% Mn, ≤0.030% P, ≤0.20% S, 0.3-3.0% Cr, ≤0.30% Cu, 0.001-0.10% Al, <0.01% N, <0.05% Ti, 0.001-0.005% B and having the relation between Ti and N as 3.4N[%]<Ti[%] and further, anyone or both of 0.02-0.50% Nb and 0.02-0.50% V, and the balance Fe with inevitable impurities, is used and is formed into the component shape with a machining or a forging, and then the vacuum-carburization-quenching is performed and thereafter, the direct-quenching is applied one or more times and tempering is applied to manufacture the carburized component. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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