Railway wheel
AssigneeNippon Steel Corporation
InventorsTaketo Maejima, Manabu Kubota
Life of this patent
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Abstract
The railway wheel according to the present embodiment has a chemical composition consisting of: in mass %, C: 0.80 to 1.15%, Si: 0.45% or less, Mn: 0.10 to 0.85%, P: 0.050% or less, S: 0.030% or less, Al: 0.200 to 1.500%, N: 0.0200% or less, Nb: 0.005 to 0.050%, Cr: 0 to 0.25%, and V: 0 to 0.12%, with the balance being Fe and impurities, wherein at least in the microstructure of the rim part and the web part, the amount of pro-eutectoid cementite defined by Formula (1) is 2.00 pieces/100 μm or less: Amount of pro-eutectoid cementite(pieces/100 μm)=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 μm×200 μm/(5.66×100 μm)×100 (1).
Claims4
A railway wheel, comprising:
- a rim part,
- a hub part, and
- a web part which is disposed between the rim part and the hub part and is linked to the rim part and the hub part, wherein
- a chemical composition of the railway wheel consists of:
- in mass %,
- C:
- 0.80 to 1.15%,
- Si:
- 0.45% or less,
- Mn:
- 0.10 to 0.85%,
- P:
- 0.050% or less,
- S:
- 0.030% or less,
- Al:
- 0.200 to 1.500%,
- N:
- 0.0200% or less,
- Nb:
- 0.005 to 0.050%,
- Cr:
- 0 to 0.25%, and
- V:
- 0 to 0.12%, with
- the balance being Fe and impurities, and wherein
- at least in microstructures of the rim part and the web part among the rim part, the hub part, and the web part of the railway wheel, an amount of pro-eutectoid cementite defined by Formula (1) is 2.00 pieces/100 μm or less:
- Amount of pro-eutectoid cementite(pieces/100 μm)=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 μm×200 μm/(5.66×100 μm)×100 (1).
Dependencies are inferred from the claim text.