Railway vehicle wheel and method for manufacturing railway vehicle wheel
US-2017191149-A1 · Jul 6, 2017 · US
Railway wheel
US11458762B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11458762-B2 |
| Application number | US-201816493159-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 30, 2018 |
| Priority date | Mar 31, 2017 |
| Publication date | Oct 4, 2022 |
| Grant date | Oct 4, 2022 |
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Abstract
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A railway wheel is capable of suppressing formation of pro-eutectoid cementite even if the C content is high. The railway wheel 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: 0.120 to 0.650%; N: 0.0030 to 0.0200%; Cr: 0 to 0.25%; and V: 0 to 0.12%, with the balance being Fe and impurities, wherein an amount of pro-eutectoid cementite, which is defined by Formula (1), in a microstructure of the railway wheel is not more than 1.50 pieces/100 μm:Amount of pro-eutectoid cementite (pieces/100=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) (1).
First claim
Opening claim text (preview).
The invention claimed is: 1. A railway wheel, comprising 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: 0.120 to 0.650%, N: 0.0030 to 0.0200%, Cr: 0 to 0.25%, and V: Oto 0.12%, with the balance being Fe and impurities, wherein an area fraction of pearlite in a microstructure of the railway wheel is not less than 95%, and an amount of pro-eutectoid cementite, which is defined by Formula (1), in the microstructure of the railway wheel is not more than 1.50 pieces/100 μm: 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) (1), further comprising AlN particles in the microstructure wherein an average particle size of the AlN particles present in the microstructure is 150 nm or less. 2. The railway wheel according to claim 1 , wherein the Al in the chemical composition is between 0.120 to 0.350% in mass %. 3. The railway wheel according to claim 1 , wherein one or more of the Cr and V in the chemical composition is between, in mass %: Cr: 0.02 to 0.25%, and V: 0.02 to 0.12%. 4. The railway wheel according to claim 1 , wherein a prior-γ grain size present in the railway wheel is 50 μm or less. 5. The railway wheel according to claim 2 , wherein one or more of the Cr and V in the chemical composition is between, in mass %: Cr: 0.02 to 0.25%, and V: 0.02 to 0.12%.
Assignees
Inventors
Classifications
- B60B17/0006Primary
Construction of wheel bodies, e.g. disc wheels (B60B17/0003 takes precedence) · CPC title
containing Mn · CPC title
Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title
- C22C38/02Primary
containing silicon · CPC title
containing chromium · CPC title
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- What does patent US11458762B2 cover?
- A railway wheel is capable of suppressing formation of pro-eutectoid cementite even if the C content is high. The railway wheel 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: 0.120 to 0.650%; N: 0.0030 to 0.0200%; Cr: 0 to 0.25%; and V: 0 to 0.12%, with the balance being Fe and impurities, wh…
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification B60B17/0006. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Oct 04 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).