Non-thermal refined soft-nitrided component

1. A non-thermal refined soft-nitrided component having a compound layer in a surface layer of a steel material of a base metal, chemical composition of the steel material of the base metal containing: in mass %,

C: 0.25 to 0.40%;

Si: 0.10 to 0.35%;

Mn: more than 2.0% to 2.8% or less;

N: 0.0030 to 0.0250%;

Cu: 0 to 1.0%;

Mo: 0 to 0.3%;

Ni: 0 to 0.5%;

Ti: 0 to 0.020%; and

a balance being Fe and impurities, the impurities including P: 0.08% or less; S: 0.10% or less; Al: 0.05% or less; and Cr: less than 0.20%,

wherein

an HV hardness at a position of 0.05 mm from the surface is 400 to 480,

an HV hardness at a position of 1.0 mm from the surface is 200 or more,

and

a compound-layer depth at a stress concentrated region is 5 μm or less.

2. The non-thermal refined soft-nitrided component according to claim 1 , wherein

the steel material of the base metal contains, in mass %, one or more types of elements selected from Cu: 0.05 to 1.0% and Mo: 0.05 to 0.3%.

3. The non-thermal refined soft-nitrided component according to claim 1 , wherein

the steel material of the base metal contains, in mass %, one or more types of elements selected from Ni: 0.05 to 0.5% and Ti: 0.005 to 0.020%.