Title:
THREADED JOINT FOR STEEL PIPE EXCELLENT IN SEIZURE RESISTANCE AND RUST PREVENTABILITY
Document Type and Number:
Japanese Patent JP3931564
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a threaded joint for a steel pipe which is excellent in seizure resistance, rust preventability and airtightness, and can be fastened and loosened repeatedly even in a high temperature circumstance without using a compound grease containing a heavy metal powder.
SOLUTION: On the threaded part or non-threaded metal contacting part of at least either one of a pin or a box, of which the threaded joint for a steel pipe is composed, a porous zinc or zinc alloy layer is formed by a mechanical plating method. Further, on the porous layer, a liquid lubrication film containing no solid lubrication film or heavy metal powder (e.g. a film comprising a highly basic organic metal salt such as highly basic sulfonate as a main component) is formed.
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Inventors:
Kunio Goto
Toshiro Anraku
Toshiro Anraku
Application Number:
JP2001017257A
Publication Date:
June 20, 2007
Filing Date:
January 25, 2001
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
E21B17/042; C10M103/00; F16L15/04; C10M103/02; C10M103/06; C10M105/72; C10M105/74; C10M107/38; C10M143/02; C10M145/20; C10M145/24; C10M149/18; C10M151/04; C10M155/00; C10M155/02; C10M159/20; C10M159/22; C10M159/24; F16L15/00; F16L58/08; F16L58/18; C10N10/02; C10N10/04; C10N10/06; C10N10/08; C10N10/12; C10N10/14; C10N20/00; C10N30/06; C10N30/12; C10N40/00; C10N50/02; C10N50/08; (IPC1-7): F16L15/04; C10M103/00; C10M103/02; C10M103/06; C10M105/72; C10M105/74; C10M107/38; C10M143/02; C10M145/20; C10M145/24; C10M149/18; C10M151/04; C10M155/00; C10M155/02; C10M159/20; C10M159/22; C10M159/24; E21B17/042; //C10N10:02; C10N10:04; C10N10:06; C10N10:08; C10N10:12; C10N10:14; C10N20:00; C10N30:06; C10N30:12; C10N40:00; C10N50:02; C10N50:08
Domestic Patent References:
| JP11173471A | ||||
| JP3247777A | ||||
| JP10158676A |
Attorney, Agent or Firm:
Shoichi Hirose