Patent ID: 8876988

Claim:
A steel for nitriding with a composition comprising, by mass %: C: 0.10% to 0.20%; Si: 0.01% to 0.7%; Mn: 0.2% to 1.29%; Cr: 0.2% to 1.3%; Al: 0.01% to less than 0.10%; V: over 0.2% to 1.0%; Mo: 0% to 0.54%; N: 0.0034 to 0.02%; P limited to not more than 0.05%; S limited to not more than 0.20%; and a balance including Fe and inevitable impurities, the composition satisfying Expression 1, where [V] is an amount of V by mass %, and [C] is an amount of C by mass %, wherein the steel for nitriding has a microstructure containing bainite of not less than 50% in terms of an area percentage, 2≦[V]/[C]≦10 (Expression 1).