Oil-well metal pipe
US12404727B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 26, 2022 |
| Grant date | Sep 2, 2025 |
| Priority date | — |
| Expiry date | Aug 26, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D5/36
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An oil-well metal pipe according to the present disclosure includes: a pipe main body that includes a pin which includes a pin contact surface including an external thread part and which is formed at a first end portion, and a box which includes a box contact surface including an internal thread part and which is formed at a second end portion; and a Zn—Ni alloy plating layer which is formed on at least one of the pin contact surface and the box contact surface. The X-ray diffraction intensities of the Zn—Ni alloy plating layer satisfy Formula (1).Here, in Formula (1), in units of cps, an X-ray diffraction intensity of {411} and {330} is substituted for I18, an X-ray diffraction intensity of {442} and {600} is substituted for I36, and an X-ray diffraction intensity of {552} is substituted for I54.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.