Oil well pipe joint and manufacturing method therefor
US4871194A · kind A · utility
21Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1987 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Dec 31, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L58/182
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an oil well pipe joint having improved resistance to galling and to a process for manufacturing the same, which comprises a porous blast-plated layer provided at least on a metal sealing portion by blasting soft metal particles such as of zinc and aluminum, particularly discrete particles each comprising an iron or iron alloy core covered by a zinc or a zinc alloy coating with an iron-zinc alloy layer intervening therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.