# US 11,110,741 B2 · Railway wheel

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,110,741 B2
- Document ID: US11110741B2
- Status: Granted
- Kind: B2
- Application number: 16/074,137
- Filed: 2017-02-28
- Published: 2020-08-27
- Granted: 2021-09-07
- Earliest claimed: 2016-03-02
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel & Sumitomo Metal Corporation
- Inventors: Manabu Kubota
- Web page: https://patentgrep.com/patent/US11110741B2

## CPC

- B60B 17/00: Wheels characterised by rail-engaging elements ({wheel-axle combinations B60B37/00;} of model railways A63H19/22)
- B32B 15/00: Layered products comprising {a layer of} metal
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- B32B 15/011: {all layers being formed of iron alloys or steels}
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- C21D 9/0068: {for particular articles not mentioned below}
- C21D 9/04: for rails
- C22C 38/001: {containing N}
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/008: {containing tin}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/08: containing nickel {(C22C38/105 takes precedence)}
- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/14: containing titanium or zirconium
- C22C 38/16: containing copper
- C22C 38/18: containing chromium
- C22C 38/20: with copper
- C22C 38/22: with molybdenum or tungsten
- C22C 38/24: with vanadium
- C22C 38/26: with niobium or tantalum
- C22C 38/28: with titanium or zirconium
- C22C 38/40: with nickel
- B60B 2360/102: Steel
- B60B 2900/141: Corrosions
- B60Y 2200/30: Railway vehicles
- C21D 1/18: Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62)
- C21D 2211/009: Pearlite
- Y10T 428/12951: Fe-base component
- Y10T 428/12958: Next to Fe-base component
- Y10T 428/12965: Both containing 0.01-1.7% carbon [i.e., steel]
- Y10T 428/12972: Containing 0.01-1.7% carbon [i.e., steel]
- Y10T 428/21: Circular sheet or circular blank
- Y10T 428/218: Aperture containing
- Y10T 428/219: Edge structure
- Y10T 428/24273: including aperture
- Y10T 428/24281: Struck out portion type
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

To provide a railway wheel which is excellent in corrosion fatigue resistance. The railway wheel according to the present embodiment has a chemical composition consisting of: in mass %, C: 0.65 to 0.80%, Si: 0.10 to 1.0%, Mn: 0.10 to 1.0%, P: not more than 0.030%, S: not more than 0.030%, Cr: 0.05 to 0.20%, Sn: 0.005 to 0.50%, Al: 0.010 to 0.050%, N: 0.0020 to 0.015%, Cu: 0 to 0.20%, Ni: 0 to 0.20%, Mo: 0 to 0.20%, V: 0 to 0.20%, Nb: 0 to 0.030%, and Ti: 0 to 0.030%, with the balance being Fe and impurities. A plate portion has a matrix structure composed of pearlite.

## Claims

### Claim 1

A railway wheel, comprising a chemical composition consisting of: in mass %,
C: 0.65 to 0.80%,
Si: 0.10 to 1.0%,
Mn: 0.10 to 1.0%,
P: not more than 0.030%,
S: not more than 0.030%,
Cr: 0.05 to 0.20%,
Sn: 0.005 to 0.50%,
Al: 0.010 to 0.050%,
N: 0.0020 to 0.015%,
Cu: 0 to 0.20%,
Ni: 0 to 0.20%,
Mo: 0 to 0.20%,
V: 0 to 0.20%,
Nb: 0 to 0.030%, and
Ti: 0 to 0.030%,
with the balance being Fe and impurities, wherein
in a matrix of a plate portion of the railway wheel, an area fraction of pearlite is not less than 95%.

### Claim 2 (depends on 1)

The railway wheel according to claim 1, wherein the chemical composition contains at least one element selected from the group consisting of
Cu: 0.02 to 0.20% and
Ni: 0.02 to 0.20%.

### Claim 3 (depends on 2)

The railway wheel according to claim 2, wherein the chemical composition contains at least one element selected from the group consisting of
Mo: 0.005 to 0.20%,
V: 0.005 to 0.20%,
Nb: 0.010 to 0.030%, and
Ti: 0.010 to 0.030%.

### Claim 4 (depends on 1)

The railway wheel according to claim 1, wherein the chemical composition contains at least one element selected from the group consisting of
Mo: 0.005 to 0.20%,
V: 0.005 to 0.20%,
Nb: 0.010 to 0.030%, and
Ti: 0.010 to 0.030%.