Steel for nitrocarburizing, nitrocarburized steel part, and producing method of nitrocarburized steel part

1. A steel for nitrocarburizing, consisting of, by mass %:

C: 0% to 0.067%;

Si: 0.01% to 1.00%;

Mn: 0.29% to 1.00%;

S: 0.0001% to 0.050%;

Al: 0.0001% to 0.050%;

Ti: more than 0.50% to 1.50%;

N: 0.0005% to 0.0100%; and

a balance consisting of Fe and inevitable impurities,

wherein P is limited to 0.050% or less;

O is limited to 0.0060% or less; and

an amount of Ti [Ti %], an amount of C [C %], an amount of N [N %], and an amount of S [S %] satisfy 0.48<[Ti %]−47.9×([C %]/12+[N %]/14+[S %]/32)≦1.20.

2. The steel for nitrocarburizing according to claim 1 , wherein the amount of Ti [Ti] is 0.60% to 1.50%.

3. A steel for nitrocarburizing, consisting of, by mass %:

C: 0% to 0.067%;

Si: 0.01% to 1.00%;

Mn: 0.29% to 1.00%;

S: 0.0001% to 0.050%;

Al: 0.0001% to 0.050%;

Ti: more than 0.50% to 1.50%;

N: 0.0005% to 0.0100%;

at least one of

Cr: 0.01% to less than 0.30%;

Mo: 0.01% to 1.00%;

V: 0.005% to 0.50%;

Nb: 0.005% to 0.10%;

Cu: 0.05% to 2.00%;

Ni: 0.05% to less than 2.00%; or

B: 0.0005% to 0.0050%; and

a balance consisting of Fe and inevitable impurities,

wherein P is limited to 0.050% or less;

O is limited to 0.0060% or less; and

an amount of Ti [Ti %], an amount of C [C %], an amount of N [N %], and an amount of S [S %] satisfy 0.48<[Ti %]−47.9×([C %]/12+[N %]/14+[S %]/32)≦1.20.

4. The steel for nitrocarburizing according to claim 3 , wherein the amount of Ti [Ti] is 0.60% to 1.50%.