Composition, and threaded connection for pipes including lubricant coating layer formed from the composition

Patent metadata

Field	Value
Publication number	US-11987765-B2
Application number	US-201917416247-A
Country	US
Kind code	B2
Filing date	Dec 25, 2019
Priority date	Jan 7, 2019
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

The composition according to the present disclosure is a composition for forming a lubricant coating layer on or above a threaded connection for pipes, and contains polyisobutylene, a metal soap, a wax and a basic metal salt of an aromatic organic acid. The threaded connection for pipes according to the present disclosure includes: a pin having a pin-side contact surface which includes a pin-side threaded portion; a box having a box-side contact surface which includes a box-side threaded portion; and a lubricant coating layer formed from the aforementioned composition as an outermost layer on or above at least one of the pin-side contact surface and the box-side contact surface.

First claim

The invention claimed is:

1. A threaded connection for pipes used to fasten oil country tubular goods, comprising:
a pin having a pin-side contact surface including a pin-side threaded portion;
a box having a box-side contact surface including a box-side threaded portion; and
a lubricant coating layer comprising:
polyisobutylene: 5 to 25 mass %,
a metal soap: 2 to 30 mass %,
a wax: 2 to 30 mass %, and
a basic metal salt of an aromatic organic acid: 10 to 70 mass %,
when a total amount of non-volatile components in the lubricant coating is taken as 100 mass %,

wherein
the lubricant coating is as an outermost layer on or above at least one of the pin-side contact surface and the box-side contact surface,
the average molecular weight of the polyisobutylene is 50,000 to 100,000, and
the polyisobutylene is a semi-solid polymer with high viscosity.

2. The threaded connection for pipes according to claim 1 , wherein:
the threaded connection comprises the lubricant coating layer on or above the pin-side contact surface.

3. The threaded connection for pipes according to claim 2 , wherein:
the threaded connection further comprises a plating layer between the pin-side contact surface and the lubricant coating layer.

4. The threaded connection for pipes according to claim 3 , wherein:
the threaded connection further comprises a chemical conversion treatment layer between the lubricant coating layer and the plating layer.

5. The threaded connection for pipes according to claim 2 , wherein:
the pin-side contact surface is a surface that is subjected to one or more types of treatment selected from the group consisting of a blasting treatment and pickling.

6. The threaded connection for pipes according to claim 3 , wherein:
the plating layer surface is a surface that is subjected to one or more types of treatment selected from the group consisting of a blasting treatment and pickling.

7. The threaded connection for pipes according to claim 1 , wherein:
the threaded connection comprises the lubricant coating layer on or above the box-side contact surface.

8. The threaded connection for pipes according to claim 7 , wherein:
the threaded connection further comprises a plating layer between the box-side contact surface and the lubricant coating layer.

9. The threaded connection for pipes according to claim 8 , wherein:
the threaded connection further comprises a chemical conversion treatment layer between the lubricant coating layer and the plating layer.

10. The threaded connection for pipes according to claim 7 , wherein:
the box-side contact surface is a surface that is subjected to one or more types of treatment selected from the group consisting of a blasting treatment and pickling.

11. The threaded connection for pipes according to claim 8 , wherein:
the plating layer surface is a surface that is subjected to one or more types of treatment selected from the group consisting of a blasting treatment and pickling.

12. The threaded connection for pipes according to claim 1 , wherein:
the pin-side contact surface further includes a pin-side metal seal portion and a pin-side shoulder portion; and
the box-side contact surface further includes a box-side metal seal portion and a box-side shoulder portion.

13. A composition for forming the lubricant coating layer on or above the threaded connection for pipes according to claim 1 , the composition comprising:
the polyisobutylene: 5 to 25 mass %,
the metal soap: 2 to 30 mass %,
the wax: 2 to 30 mass %, and
the basic metal salt of an aromatic organic acid: 10 to 60 mass %,
when a total amount of non-volatile components in the composition is taken as 100 mass %,
wherein the average molecular weight of the polyisobutylene is 50,000 to 100,000, and
the polyisobutylene is a semi-solid polymer with high viscosity.

14. The composition according to claim 13 , wherein:
the composition further comprises:
a lubricant powder.

15. The composition according to claim 14 , wherein:
when a total amount of non-volatile components in the composition is taken as 100 mass %, the composition comprises:
the lubricant powder: 0.5 to 20 mass %.

16. The composition according to claim 14 , wherein:
the lubricant powder is one or more types selected from the group consisting of graphite and polytetrafluoroethylene.

17. The composition according to claim 13 , wherein:
the composition further comprises:
a volatile organic solvent.

Assignees

• Nippon Steel Corp
• Vallourec Oil & Gas France

Inventors

• Goto Kunio
• Abe Tomoka

Classifications

• C10M169/00 Primary

  Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential · CPC title

• C10M101/025

  waxes · CPC title

• C10M103/02

  Carbon; Graphite · CPC title

• C10M107/08

  containing butene · CPC title

• C10M107/38

  containing halogen · CPC title