US 11,987,765 B2
Composition, and threaded connection for pipes including lubricant coating layer formed from the composition
Kunio Goto, Tokyo (JP); and Tomoka Abe, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP); and VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries (FR)
Appl. No. 17/416,247
Filed by NIPPON STEEL CORPORATION, Tokyo (JP); and VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries (FR)
PCT Filed Dec. 25, 2019, PCT No. PCT/JP2019/050986
§ 371(c)(1), (2) Date Jun. 18, 2021,
PCT Pub. No. WO2020/145162, PCT Pub. Date Jul. 16, 2020.
Claims priority of application No. 2019-000871 (JP), filed on Jan. 7, 2019.
Prior Publication US 2022/0064561 A1, Mar. 3, 2022
Int. Cl. C10M 169/00 (2006.01); C10M 101/02 (2006.01); C10M 103/02 (2006.01); C10M 107/08 (2006.01); C10M 107/38 (2006.01); C10M 111/04 (2006.01); C10M 117/02 (2006.01); C10M 129/50 (2006.01); C10M 129/54 (2006.01); C10M 135/10 (2006.01); F16L 15/00 (2006.01); F16L 15/08 (2006.01); C10N 50/08 (2006.01)
CPC C10M 169/00 (2013.01) [C10M 101/025 (2013.01); C10M 103/02 (2013.01); C10M 107/08 (2013.01); C10M 107/38 (2013.01); C10M 111/04 (2013.01); C10M 117/02 (2013.01); C10M 129/50 (2013.01); C10M 129/54 (2013.01); C10M 135/10 (2013.01); F16L 15/006 (2013.01); F16L 15/08 (2013.01); C10M 2205/0265 (2013.01); C10M 2205/163 (2013.01); C10M 2207/1265 (2013.01); C10M 2207/141 (2013.01); C10M 2207/144 (2013.01); C10M 2213/0623 (2013.01); C10M 2219/044 (2013.01); C10N 2050/08 (2013.01)] 17 Claims
OG exemplary drawing
 
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.