Non-heat treated steel

1. A non-heat treated steel comprising, as steel composition, by mass %,

C: 0.20 to 0.60%,

Si: 0.50 to 2.0%,

Mn: 0.20 to 2.0%,

P: 0.010 to 0.15%,

S: 0.010 to 0.15%,

V: 0.25 to 0.50%,

N: 0.002 to 0.02%, and

a balance comprising Fe and impurities,

wherein a ratio of a maximum value of a V content in the steel to an average value of the V content in the steel in a cross section of the steel is defined as a segregation ratio of V,

wherein the segregation ratio of V is 1.0 or more and less than 3.0, and

wherein the non-heat treated steel is used with fracture splitting.

2. The non-heat treated steel according to claim 1 , further comprising at least one selected from the group consisting of, by mass %,

Ca: 0.005% or less,

Mg: 0.005% or less, and

Zr: 0.005% or less.

3. The non-heat treated steel according to claim 1 , further comprising at least one selected from the group consisting of, by mass %,

Cr: 0.25% or less,

Ti: 0.10% or less, and

Nb: 0.05% or less.

4. The non-heat treated steel according to claim 2 , further comprising at least one selected from the group consisting of, by mass %,

Cr: 0.25% or less,

Ti: 0.10% or less, and

Nb: 0.05% or less.

5. The non-heat treated steel according to claim 1 , wherein the upper limit of the amount of C is 0.50 mass %.

6. The non-heat treated steel according to claim 1 , further comprising at least one selected from the group consisting of, by mass %,

Mg: 0.0005 to 0.005%,

Zr: 0.0005 to 0.005%, and

Cr: 0.01 to 0.25%.