| 摘要 |
A steel for wheel containing in mass%, C: 0.65 to 0.84%, Si: 0.4 to 1.0%, Mn: 0.50 to 1.40%, Cr: 0.02 to 0.13%, S: 0.04% or less and V: 0.02 to 0.12%, wherein Fn1 expressed by the following formula (1) is 32 to 43, and Fn2 expressed by formula (2) is 25 or less, the balance being Fe and impurities, P, Cu and Ni in the impurities are P: 0.05% or less, Cu: 0.20% or less and Ni: 0.20% or less: Fn �¢ 1 = 2.7 + 29.5 × C + 2.9 × Si + 6.9 × Mn + 10.8 × Cr + 30.3 × Mo + 44.3 × V Fn �¢ 2 = exp 0.76 × exp 0.05 × C × exp 1.35 × Si × exp 0.38 × Mn × exp 0.77 × Cr × exp 3.0 × Mo × exp 4.6 × V The steel for wheel is excellent in balance of wear resistance, rolling contact fatigue resistance and spalling resistance, includes high yield strength at high temperature and high ductility, and can give a long life to the wheel. |
