NON-HEAT-TREATED FORGED COMPONENT AND NON-HEAT-TREATED FORGING STEEL

To provide a non-heat-treated forged component that can achieve following: high strength and excellent manufacturability, and particularly, prevention of surface cracking during continuous casting, and a non-heat-treated forging steel useful for the production of the non-heat-treated forged component.SOLUTION: A non-heat-treated forged component has a predetermined chemical composition, satisfies all of the following formulae (1)-(4), has a bainite fraction of 5 area% or less and a ferrite fraction of 25 area% or less with respect to the whole structure, with the balance being perlite. 1.10≤[C]+0.5×[Mn]+0.3×[Cr]+0.9×[V]≤1.28 (1), [Mn]/[Cr]≤1.2 (2), [C]×([V]-[N]×50.94/14.0)≥0.130 (3), [V]×([N]-[Ti]×14.0/47.9)×10000≤35.0 (4), where, in the formulae (1)-(4), [Element Name] denotes a content represented by mass% of each element.SELECTED DRAWING: None 【課題】高強度と、優れた製造性、特には連続鋳造時の表面割れ防止とを両立できる非調質鍛造部品と、該非調質鍛造部品の製造に有用な非調質鍛造用鋼を提供する。【解決手段】所定の化学組成を有し、下記式（１）〜（４）を全て満たし、更に、全組織に対する、ベイナイトの分率が５面積％以下であり、かつフェライトの分率が２５面積％以下であり、残部がパーライトであることを特徴とする非調質鍛造部品。１．１０≦［Ｃ］＋０．５×［Ｍｎ］＋０．３×［Ｃｒ］＋０．９×［Ｖ］≦１．２８・・・（１）、［Ｍｎ］／［Ｃｒ］≦１．２・・・（２）、［Ｃ］×（［Ｖ］−［Ｎ］×５０．９４／１４．０）≧０．１３０・・・（３）、［Ｖ］×（［Ｎ］−［Ｔｉ］×１４．０／４７．９）×１００００≦３５．０ ・・・（４）、但し、上記式（１）〜（４）において、［元素名］は各元素の質量％で表される含有量を意味する。【選択図】なし