STEEL MATERIAL FOR NITRIDING INDUCTION HARDENING AND STEEL COMPONENT

To provide a steel material for nitriding induction hardening that offers superior surface fatigue strength and bending fatigue strength, while also suitable for cold forging, and to provide a steel component.SOLUTION: A steel material for nitriding induction hardening comprises, in mass%, C: 0.05-0.20%, Si: 0.05-0.30%, Mn: 0.20-0.70%, P: 0.030% or less, S: 0.030% or less, Cr: 1.00-2.00%, V: 0.05-0.35%, Al: 0.070% or less, and N: 0.0250% or less, with C, Cr, and V satisfying the formula (1), and Al and N satisfying the formula (2), and with the balance being Fe and impurities. Formula (1): 13.0≤(Cr+3V)/C and Formula (2): 0.70≤Al/N≤2.90. In the formula (1) and the formula (2), each element symbol denotes the content of the element as expressed in mass%.SELECTED DRAWING: None 【課題】面疲労強度及び曲げ疲労強度に優れ、かつ冷間鍛造可能な窒化高周波焼入れ用鋼材及び鋼部品を提供する。【解決手段】質量％で、Ｃ：０．０５～０．２０％、Ｓｉ：０．０５～０．３０％、Ｍｎ：０．２０～０．７０％、Ｐ：０．０３０％以下、Ｓ：０．０３０％以下、Ｃｒ：１．００～２．００％、Ｖ：０．０５～０．３５％、Ａｌ：０．０７０％以下、及びＮ：０．０２５０％以下であり、Ｃ、Ｃｒ、及びＶが下記式（１）を満たし、かつＡｌ及びＮが下記式（２）を満たし、残部がＦｅ及び不純物である化学組成を有する、窒化高周波焼入れ用鋼材。１３．０≦（Ｃｒ＋３Ｖ）／Ｃ ・・・ 式（１）０．７０≦Ａｌ／Ｎ≦２．９０ ・・・ 式（２）ただし、上記式（１）及び上記式（２）中の各元素記号は当該元素の質量％での含有量である。【選択図】なし