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Abstract

A non-heat treated steel for induction hardening contains, in mass %, C: 0.35 to 0.44%, Si: 0.01 to less than 0.30%, Mn: 0.80 to 1.50%, P: 0.030% or less, S: more than 0.010 to 0.095%, Cr: more than 0.10 to 0.30%, V: 0.050 to 0.200%, N: 0.0040 to 0.0200%, O: 0.0024% or less, Cu: 0.05% or less and Ni: 0.05% or less, and for which fn1≤50.0, fn2: 0.70 to 1.00, and fn3≥1.30. In the steel, a ratio of a number of Mn oxides containing oxygen in an amount of 20.0 mass % or more and Mn in an amount of 10.0 mass % or more to the number of oxides is 10.0% or less

description='In-line Formulae' end='lead'fn1=80C²+55C+13Si+4.8Mn+30P+30S+1.5Crdescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'fn2=C+(Si/10)+(Mn/5)−(5S/7)+(5Cr/22)+1.65Vdescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'fn3=−2C—Si+2.33Mn+0.26Cr+V−1.5Cu−1.5Ni.description='In-line Formulae' end='tail'

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