Steel for wheel
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsYuichiro Yamamoto, Yukiteru Takeshita, Kentaro Kiriyama, Takanori Kato
Life of this patent
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Abstract
A steel for wheel contains, 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 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 as impurities are P: 0.05% or less, Cu: 0.20% or less and Ni: 0.20% or less: Fn1=2.7+29.5'C+2.9'Si+6.9'Mn+10.8'Cr+30.3'Mo+44.3'V (1) Fn2=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) (2). The steel has excellent properties for use as a wheel.
Claims4
A steel for wheel comprising:
- in mass %,
- C:
- 0.65 to 0.84%;
- Si:
- 0.65 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 the following formula (2) is 25 or less,
- the balance being Fe and impurities, and
- P, Cu and Ni in the impurities are
- P:
- 0.05% or less,
- Cu:
- 0.20% or less, and
- NI:
- 0.20% or less:
- Fn1=2.7+29.5×C+2.9×Si+6.9×Mn+10.8×Cr+30.3×Mo+44.3×V (1)
- Fn2=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) (2)
- where each symbol of element in the formulas (1) and (2) means content (mass %) of each element.
Dependencies are inferred from the claim text.