# US 10,118,259 B1 · Corrosion resistant bimetallic tube manufactured by a two-step process

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- Number: US 10,118,259 B1
- Document ID: US10118259B1
- Status: Granted
- Kind: B1
- Application number: 14/103,483
- Filed: 2013-12-11
- Granted: 2018-11-06
- Earliest claimed: 2012-12-11
- Assignees: ATI Properties, Inc.
- Applicants: Ati Properties LLC
- Inventors: Matthew V. Fonte
- Web page: https://patentgrep.com/patent/US10118259B1

## CPC

- B23K 31/027: {Making tubes by soldering or welding}
- B21B 17/00: Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21C 23/085: {Making tubes (B21C23/10 take precedence)}
- B21C 23/22: Making metal-coated products; Making products from two or more metals
- B23K 20/021: {Isostatic pressure welding}
- B23K 20/22: taking account of the properties of the materials to be welded
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04)
- B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL

## Abstract

A method of producing a bimetallic tubular component includes providing a first tubular workpiece having an inner diameter and a second tubular workpiece having an outer diameter. The first and second tubular workpieces have dissimilar cold-working processing parameters. The method further includes diffusion bonding the inner diameter of the first tubular workpiece to the outer diameter of the second tubular workpiece, and flowforming the diffusion bonded tubular workpieces to form the bimetallic tubular component.

## Claims

### Claim 1

A method of producing a bimetallic tubular component, the method comprising:
providing a first tubular workpiece having an inner diameter and a second tubular workpiece having an outer diameter, the first and second tubular workpieces having dissimilar cold-working processing parameters, wherein the second tubular workpiece comprises a corrosion resistant alloy, wherein the first tubular workpiece comprises one of a duplex stainless steel and an aluminum alloy, wherein the first tubular workpiece has a hardness of 100 Vickers or greater, and wherein the second tubular workpiece has a hardness value greater than two times the hardness value of the first tubular workpiece;
diffusion bonding the inner diameter of the first tubular workpiece to the outer diameter of the second tubular workpiece; and
flowforming the diffusion bonded tubular workpieces to form the bimetallic tubular component without any heat treatment after the flowforming.

### Claim 2 (depends on 1)

The method of claim 1, wherein the cold-working processing parameters are selected from the group consisting of feed rates, speed rates, and wall reduction percentages.

### Claim 3 (depends on 1)

The method of claim 1, wherein the diffusion bonding is a hot isostatic pressing process.

### Claim 4 (depends on 3)

The method of claim 3, wherein the hot isostatic pressing process is performed in an inert atmosphere.

### Claim 5 (depends on 1)

The method of claim 1, wherein each tubular workpiece has an end and a gap is formed between the inner diameter and the outer diameter, the method further comprising:
providing a port that goes through the first tubular workpiece to the gap between the two workpieces;
sealing the end of the first tubular workpiece to the end of the second tubular workpiece in order to form a sealed area between the two workpieces; and
forming a vacuum between the two workpieces in the gap before the diffusion bonding process.

### Claim 6 (depends on 1)

The method of claim 1, wherein the second tubular workpiece comprises one of Alloy C-276 and Alloy 625.

### Claim 7 (depends on 1)

The method of claim 1, wherein the diffusion bonded tubular workpieces are flowformed to a wall reduction of 20% to 31.7%.