Rail vehicle axle
Provided is a rail vehicle axle having an excellent fatigue limit and notch factor. A rail vehicle axle according to the present embodiment has a chemical composition consisting of, in mass %, C: 0.20 to 0.35%, Si: 0.20 to 0.65%, Mn: 0.40 to 1.20%, P: 0.020% or less, S: 0.020% or less, Cu: 0 to 0.30%, Ni: 0 to 0.30%, Cr: 0 to 0.30%, Mo: 0 to 0.08%, Al: 0 to 0.100%, N: 0.0200% or less, V: 0 to 0.060%, and Ti: 0 to 0.020%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2): 0.58≤C+Si/8+Mn/5+Cu/10+Cr/4+V≤0.67 (1) Si+0.9Cr≥0.50 (2) where, each element symbol in Formulae (1) and (2) is substituted by the content (mass %) of a corresponding element.
1. A rail vehicle axle comprising:
a chemical composition consisting of, in mass %,
C: 0.20 to 0.35%,
Si: 0.20 to 0.65%,
Mn: 0.40 to 1.20%,
P: 0.020% or less,
S: 0.020% or less,
Cu: 0.01 to 0.30%,
Ni: 0 to 0.30%,
Cr: 0 to 0.30%,
Mo: 0.005 to 0.08%,
Al: 0 to 0.100%,
N: 0.0200% or less,
V: 0 to 0.060%, and
Ti: 0 to 0.020%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2):
0.58≤C+Si/8+Mn/5+Cu/10+Cr/4+V≤0.67 (1)
Si+0.9Cr≥0.60 (2)
where each element symbol in Formulae (1) and (2) is substituted by the content (mass %) of a corresponding element,
wherein the tensile strength is 590 to 650 MPa.
2. The rail vehicle axle according to claim 1 , wherein the chemical composition contains Ti: 0.003 to 0.015%.