# US 4,399,198 A · Lining alloy for bimetallic cylinders

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- Number: US 4,399,198 A
- Document ID: US4399198A
- Status: Granted
- Kind: A
- Application number: 06/284,631
- Filed: 1981-07-20
- Granted: 1983-08-16
- Earliest claimed: 1981-07-20
- Inventors: Donald P. Lomax; Ronald M. Boggs
- Web page: https://patentgrep.com/patent/US4399198A

## CPC

- C22C 32/0052: {only carbides}
- B29C 45/62: Barrels or cylinders
- C22C 30/00: Alloys containing less than 50% by weight of each constituent
- Y10T 428/12354: Nonplanar, uniform-thickness material having symmetrical channel shape or reverse fold [e.g., making acute angle, etc.]
- Y10T 428/12931: Co-, Fe-, or Ni-base components, alternative to each other
- Y10T 428/12937: Co- or Ni-base component next to Fe-base component
- Y10T 428/12972: Containing 0.01-1.7% carbon [i.e., steel]
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A wear and corrosion resistant alloy for lining cylinders used in extrusion and injection molding machines comprises at least two carbides admixed with a nickel-cobalt base alloy. The cylinder lining is preferably prepared by placing a quantity of the alloy in the cylinder and capping the ends of the cylinder. The cylinder is then heated above the melting point of the alloy and spun at a high rate of speed to centrifugally coat the inner surface of the cylinder. The cylinder's end caps are then removed and the lining finished to the correct internal diameter and finish by conventional lathe and hone means. The carbide mixture is evenly dispersed in the lining and produces a lining having desirable hardness and corrosion resistance throughout the thickness of the lining.

## Claims

### Claim 1

A hard, wear and corrosion resistant alloy consisting essentially of the following materials fused together in the weight percentage composition stated below:
______________________________________ Ingredient Weight Percent ______________________________________ Carbon 0.16 to 0.35 Nickel 28.50 to 34.60 Manganese 0.34 to 0.75 Silicon 0.75 to 1.90 Chromium 4.50 to 7.50 Boron 2.25 to 2.90 Cobalt 28.50 to 42.00 Vanadium Carbide 8.00 to 15.00 Tungsten Carbide 2.00 to 7.00 Titanium Carbide 1.00 to 3.00 Tantalum Carbide 1.00 to 2.00 ______________________________________

### Claim 2

A hard, wear and corrosion resistant alloy consisting essentially of the following materials fused together in the weight percentage composition stated below:
______________________________________ Ingredient Weight Percent ______________________________________ Carbon .27 Nickel 32.82 Manganese .60 Silicon 1.19 Chromium 6.80 Boron 2.60 Cobalt 36.72 Vanadium Carbide 12.00 Tungsten Carbide 4.00 Titanium Carbide 2.00 Tantalum Carbide 1.00 ______________________________________

### Claim 3

In combination, a steel cylinder and a lining for said cylinder consisting of a hard, wear and corrosion resistant alloy consisting essentially of the following materials in the weight percentage composition stated below:
______________________________________ Ingredient Weight Percent ______________________________________ Carbon 0.16 to 0.35 Nickel 28.50 to 34.60 Manganese 0.34 to 0.75 Silicon 0.75 to 1.90 Chromium 4.50 to 7.50 Boron 2.25 to 2.90 Cobalt 28.50 to 42.00 Vanadium Carbide 8.00 to 15.00 Tungsten Carbide 2.00 to 7.00 Titanium Carbide 1.00 to 3.00 Tantalum Carbide 1.00 to 2.00 ______________________________________

### Claim 4 (depends on 3)

The invention set forth in claim 3 wherein said alloy has the following composition:
______________________________________ Ingredient Weight Percent ______________________________________ Carbon 0.25 Nickel 30.40 Manganese 0.55 Silicon 1.10 Chromium 6.30 Boron 2.40 Cobalt 34.00 Vanadium Carbide 12.00 Tungsten Carbide 4.00 Titanium Carbide 2.00 Tantalum Carbide 1.00 ______________________________________

### Claim 5 (depends on 3)

The invention of claim 3 wherein said lining is a centrifugally cast lining of said alloy.

### Claim 6 (depends on 3)

The invention of claim 3 wherein the concentration of carbides is substantially constant throughout the thickness of said alloy lining.