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Title:
THREADED JOINT FOR STEEL PIPE WITH EXCELLENT SEIZURE AND CORROSION RESISTANCES
Document Type and Number:
WIPO Patent Application WO/2002/059519
Kind Code:
A1
Abstract:
A threaded joint for steel pipe, comprising a pin and a box allowed to be fitted to each other, wherein a porous zinc or zinc alloy layer as a lower layer by a projection plating method and a solid lubrication film (film containing lubricating powder in organic or inorganic binder) or a liquid lubricating film not containing heavy metal powder (example: liquid film formed mainly of high base organic metallic salt such as high base sulphonate) as an upper layer are provided on the thread part and the metal contact part without thread of at least either of the pin and box, whereby the threaded joint can provide excellent seizure resistance, corrosion resistance, and airtightness even after exposed to high temperature, and is allowed to be tightened and loosened repeatedly in a hot oil well without using compound grease containing heavy metal powder.

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Inventors:
Goto, Kunio c/o Sumitomo Metal Industries (Ltd. 5-33 Kitahama 4-chome Chuo-ku Osaka-shi, Osaka, 541-0041, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries (Ltd. 5-33 Kitahama 4-chome Chuo-ku Osaka-shi, Osaka, 541-0041, JP)
Application Number:
PCT/JP2002/000466
Publication Date:
August 01, 2002
Filing Date:
January 23, 2002
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku Osaka-shi, Osaka, 541-0041, JP)
Goto, Kunio c/o Sumitomo Metal Industries (Ltd. 5-33 Kitahama 4-chome Chuo-ku Osaka-shi, Osaka, 541-0041, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries (Ltd. 5-33 Kitahama 4-chome Chuo-ku Osaka-shi, Osaka, 541-0041, JP)
International Classes:
E21B17/042; 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; F16L15/00; F16L15/04; 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
Attorney, Agent or Firm:
Hirose, Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chome Chuo-ku, Tokyo, 103-0023, JP)
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