Rail vehicle axle

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,
• Sn:
• 0.21 to 0.40%,
• N:
• 0.0200% or less,
• Cu:
• 0 to 0.30%,
• Ni:
• 0 to 0.30%,
• Al:
• 0 to 0.100%,
• V:
• 0 to 0.060%, and
• one or more from the group consisting of Cr:
• more than 0.20 to 0.30%, Mo:
• 0.005 to 0.08%, and Ti:
• 0.002 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 smooth fatigue limit is more than 270 MPa,
• the notched fatigue limit is more than 195 MPa, and
• a notch factor of the rail vehicle axle is not more than 1.47, where notch factor is defined by smooth fatigue limit divided by notched fatigue limit.