# US 2013/0157077 A1 · Novel Material Used for Bearing Ring and Production Process Thereof

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- Number: US 2013/0157077 A1
- Document ID: US20130157077A1
- Status: Published application
- Kind: A1
- Application number: 13/583,796
- Filed: 2011-07-29
- Published: 2013-06-20
- Earliest claimed: 2010-08-13
- Inventors: Lihui Wang; Chibo Li; Shanqin Bao; Jie Gao; Yong Tang; Yafeng Song; Xiaobin Huang
- Web page: https://patentgrep.com/patent/US20130157077A1

## CPC

- F16C 33/62: Selection of substances
- B22D 13/023: {the longitudinal axis being horizontal}
- B32B 15/011: {all layers being formed of iron alloys or steels}
- C21D 9/40: for rings; for bearing races
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/18: containing chromium
- F16C 33/121: {Use of special materials}
- F16C 33/122: {Multilayer structures of sleeves, washers or liners}
- F16C 33/14: Special methods of manufacture; Running-in
- F16C 33/64: Special methods of manufacture
- F16C 2220/06: in situ casting or moulding
- F16C 2220/46: by forging
- F16C 2220/48: by extrusion, e.g. of metallic profiles
- F16C 2220/60: by removing material, e.g. machining
- F16C 2220/66: by milling
- F16C 2223/12: with carburizing
- F16C 2223/42: by spraying the coating material, e.g. plasma spraying
- F16C 2223/44: by casting molten material on the substrate
- Y10T 428/12653: Fe, containing 0.01-1.7% carbon [i.e., steel]
- Y10T 428/12979: Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A novel material used for a bearing ring and a production process thereof is directed to a bimetallic composite pipe and a production process thereof. The aim of the disclosure is to provide a novel material used for a bearing ring and a production process thereof, in which high hardness, high wear resistance and high toughness, high impact toughness are interacted. The novel material used for a bearing ring according to the invention is composed of an annual clad layer and a base layer. The clad layer and the base layer is metallurgy bonded together in radial direction of a ring. The clad layer is made of bearing steel material, and the base layer is made of the material selected from bearing steel, straight carbon steel, high strength low/medium alloy steel or stainless steel.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A material used for a bearing ring, comprising: a clad layer and a base layer, wherein the clad layer and the base layer are metallurgical bonded together in radial direction of them, the clad layer is made of a bearing steel material and the base layer is made of a material selected from bearing steel straight carbon steel, high strength low or medium alloy steel, or stainless steel.

### Claim 12 (depends on 11)

The material used for the bearing ring of claim 11, wherein the clad layer is used as a working layer and the base layer is used as a supporting layer.

### Claim 13 (depends on 12)

The material used for the bearing ring of claim 12, wherein the clad layer is provided on the outside of the base layer in radial direction of the base layer.

### Claim 14 (depends on 12)

The material used for the bearing ring of claim 12, wherein the clad layer is provided on the inside of the base layer in radial direction of the base layer.

### Claim 15 (depends on 11)

The material used for the bearing ring of claim 11, wherein the clad layer is made of a high carbon chromium bearing steel material or a stainless bearing steel material.

### Claim 16 (depends on 12)

The material used for the bearing ring of claim 12, wherein the clad layer is made of a high carbon chromium bearing steel material or a stainless bearing steel material.

### Claim 17 (depends on 13)

The material used for the bearing ring of claim 13, wherein the clad layer is made of a high carbon chromium bearing steel material or a stainless bearing steel material.

### Claim 18 (depends on 14)

The material used for the bearing ring of claim 14, wherein the clad layer is made of a high carbon chromium bearing steel material or a stainless bearing steel material.

### Claim 19 (depends on 11)

A production process of the material used for the bearing ring of claim 11, comprising steps of:
(1) selecting material, comprising:
selecting the clad layer material, i.e. bearing steel material, according to the use condition, selecting the corresponding base layer material according to the strength requirements and the coefficient of thermal expansion of the clad layer, i.e. bearing steel material, straight carbon steel, high strength low or medium alloy steel or stainless steel, wherein the toughness of the base layer material is higher than that of the clad layer,
(2) centrifugal casting, comprising:
A: roasting a metal pipe mold to 200-300° C. and spraying, getting 1.0-3.0 mm spraying thickness;
B: roasting the sprayed metal pipe mold to 200-350° C.;
C: centrifugal casting a first liquid metal, a clay layer liquid metal or a base layer liquid metal, into the metal pipe mold of the step B and cooling;
D: numerical simulating and analyzing the heat transfer of the first metal layer which is casted and solidified, and casting a second liquid metal, the base layer liquid metal or the clad layer liquid metal, depending on the temperature analysis;
E: cooling the casted composite pipe billet to below 700° C. then demolding; and
F: heat-treating the pipe billet of the step E depending on subsequent processing conditions; and
(3) forming the composite pipe ring used for the bearing ring.

### Claim 20 (depends on 19)

The production process of the material used for the bearing ring of claim 19, wherein the step (3) comprises longitudinal rolling, comprising:
G: machining the as-cast composite pipe billet of the step F and getting the size required as longitudinal rolling; and
H: longitudinal rolling the composite pipe of the step G, consequently forming the composite pipe ring used for the bearing ring.

### Claim 21 (depends on 19)

The production process of the material used for the bearing ring of claim 19, wherein the step (3) comprises hot extrusion, comprising:
G: machining the as-cast composite pipe billet of the step F and getting the size required as hot extrusion; and
H: hot extrusion the composite pipe of the step G, consequently forming the composite pipe ring used for the bearing ring.

### Claim 22 (depends on 19)

The production process of the material used for the bearing ring of claim 19, wherein the step (3) comprises hot milling, comprising:
G: machining the as-cast composite pipe billet of the step F and getting the size required as hot milling; and
H: Hot milling the composite pipe of the step G, consequently forming the composite pipe ring used for the bearing ring.

### Claim 23 (depends on 19)

The production process of the material used for the bearing ring of claim 19, wherein the step (3) comprises forging, comprising:
G: machining the as-cast composite pipe billet of the step F and getting the size required as forging; and
H: forging the composite pipe of the step G, consequently forming the composite pipe ring used for the bearing ring.

### Claim 24 (depends on 19)

The production process of the material used for the bearing ring of claim 19, wherein the heat treatment in the step F includes normalizing, spheroidizing annealing or diffusion annealing.

### Claim 25 (depends on 20)

The production process of the material used for the bearing ring of claim 20, wherein the heat treatment in the step F includes normalizing, spheroidizing annealing or diffusion annealing.

### Claim 26 (depends on 21)

The production process of the material used for the bearing ring of claim 21, wherein the heat treatment in the step F includes normalizing, spheroidizing annealing or diffusion annealing.

### Claim 27 (depends on 22)

The production process of the material used for the bearing ring of claim 22, wherein the heat treatment in the step F includes normalizing, spheroidizing annealing or diffusion annealing.

### Claim 28 (depends on 23)

The production process of the material used for the bearing ring of claim 23, wherein the heat treatment in the step F includes normalizing, spheroidizing annealing or diffusion annealing.