# US 10,480,259 B2 · Threaded connection for pipe or tube and method for producing the threaded connection for pipe or tube

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- Number: US 10,480,259 B2
- Document ID: US10480259B2
- Status: Granted
- Kind: B2
- Application number: 16/064,775
- Filed: 2016-12-16
- Published: 2019-01-10
- Granted: 2019-11-19
- Earliest claimed: 2015-12-25
- Assignees: Nippon Steel Corporation; Vallourec Oil and Gas France
- Applicants: Nippon Steel & Sumitomo Metal Corporation; Vallourec Oil and Gas France
- Inventors: Kunio Goto
- Web page: https://patentgrep.com/patent/US10480259B2

## CPC

- E21B 17/042: Threaded
- C23C 28/00: Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C 28/021: {including at least one metal alloy layer}
- C23C 28/023: {only coatings of metal elements only}
- C23C 28/321: {with at least one metal alloy layer}
- C23C 28/322: {only coatings of metal elements only}
- C23C 28/34: {including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates}
- C25D 3/565: {containing more than 50% by weight of zinc}
- C25D 5/12: at least one layer being of nickel or chromium
- C25D 5/605: {Surface topography of the layers, e.g. rough, dendritic or nodular layers}
- C25D 5/623: {Porosity of the layers}
- C25D 7/003: {Threaded pieces, e.g. bolts or nuts}
- C25D 7/04: Tubes; Rings; Hollow bodies
- F16L 15/001: {with conical threads}
- F16L 15/04: with additional sealings
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

The present invention has an objective to provide a threaded connection for pipe or tube including a pin and a box, having excellent galling resistance, torque property, and anticorrosion property, and still having an excellent adhesiveness with a lubricating coating even when being repeatedly exposed to high temperature and very low temperature, and to provide a method for producing the threaded connection for pipe or tube. The threaded connection for pipe or tube according to the present embodiment includes a pin and a box. The pin and the box have contact surfaces including a thread portions and and unthreaded metal contact portions, respectively. The threaded connection for pipe or tube comprises an electroplating layer consisting of a Zn—Ni alloy, a mechanical plating layer consisting of Zn or a Zn alloy, and a lubricating coating, on the contact surface of at least one of the pin and the box, in this order from a contact surface side.

## Claims

### Claim 1

A threaded connection for pipe or tube comprising a pin and a box, the pin and the box each including a contact surface that includes a thread portion and an unthreaded metal contact portion, the threaded connection for pipe or tube comprising:
on the contact surface of at least one of the pin and the box,
a first plating layer consisting of a Zn—Ni alloy;
a second plating layer on the first plating layer, the second plating layer consisting of Zn or a Zn alloy, and being porous; and
a lubricating coating on the second plating layer.

### Claim 2 (depends on 1)

The threaded connection for pipe or tube according to claim 1, wherein the lubricating coating is a solid lubricant coating.

### Claim 3 (depends on 1)

The threaded connection for pipe or tube according to claim 1, wherein the porosity of the second plating layer is 5 to 80%.

### Claim 4 (depends on 3)

The threaded connection for pipe or tube according to claim 3, wherein the first plating layer has a thickness of 1 to 20 μm, the second plating layer has a thickness of 2 to 30 μm, and the lubricating coating has a thickness of 5 to 50 μm.

### Claim 5 (depends on 4)

The threaded connection for pipe or tube according to claim 4, wherein the lubricating coating is a solid lubricant coating.

### Claim 6 (depends on 3)

The threaded connection for pipe or tube according to claim 3, wherein the lubricating coating is a solid lubricant coating.

### Claim 7 (depends on 1)

The threaded connection for pipe or tube according to claim 1, wherein the first plating layer has a thickness of 1 to 20 μm, the second plating layer has a thickness of 2 to 30 μm, and the lubricating coating has a thickness of 5 to 50 μm.

### Claim 8 (depends on 7)

The threaded connection for pipe or tube according to claim 7, wherein the lubricating coating is a solid lubricant coating.

### Claim 9

A method for producing a threaded connection for pipe or tube that includes a pin and a box, the pin and the box each including a contact surface that includes a thread portion and an unthreaded metal contact portion, the method comprising the steps of:
on the contact surface of at least one of the pin and the box,
forming a first plating layer consisting of a Zn—Ni alloy by performing electroplating treatment;
forming a second plating layer consisting of Zn or a Zn alloy by performing mechanical plating treatment after forming the first plating layer; and
forming a lubricating coating after forming the second plating layer.