Steel Material

Abstract: Provided is a steel material which has exceptional machinability, in which cracking during hot working and melt cracking during induction hardening can be suppressed, and which has exceptional fatigue strength when used as a component for a machine structure. This steel material contains, in terms of mass%, 0.05-0.30% of C, 0.05-0.45% of Si, 0.30-2.00% of Mn, no more than 0.030% of P, 0.010-0.095% of S, 0.01-2.00% of Cr, 0.0051-0.1500% of Bi, and 0.0030-0.0250% of N, and satisfies expression (1). In the steel material, the number density of fine Bi particles is 80-8,000/mm2, and the number density of coarse Bi particles is 10/mm2 or less. [Expression 1]: 0.25=C+(Si/10)+(Mn/5)-(5S/7)+(5Cr/22)+1.65V=1.00

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