Composition, and threaded connection for pipes including lubricant coating layer formed from the composition
AssigneesNippon Steel Corporation, Vallourec Oil and Gas France
InventorsKunio Goto, Tomoka Abe
Life of this patent
Estimating the term…
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.
Claims17
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.
Dependencies are inferred from the claim text.