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Patent Searching and Data


Title:
THREADED JOINT FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2002/084162
Kind Code:
A1
Abstract:
A threaded joint for steel pipe formed of a pin and a box having a contact surface including threaded parts and a non-threaded metal contact part and capable of stably assuring a seizure resistance and an airtightness without applying compound grease thereto, wherein a solid lubricating film formed with lubricating powder (example: molybdenum disulfide) and organic or inorganic binder is formed on the contact surface of at least one of the pin and box, the ratio of the area occupied by the secondary particles of 15 to 60$g(m)m in equi-area equivalent diameter of the lubricating powder in the cross section of the solid lubricating film in thickness direction is 5 to 90%, and fiber-like filler (example: inorganic substance whisker) in addition to the lubricating powder is mixed into the solid lubricating film at the mass ratio of the fiber-like filler to binder of 0.01 to 0.5, whereby, particularly, the seizure resistance at high temperatures can be improved.

Inventors:
Goto, Kunio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Matsumoto, Keishi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Nakasuji, Kazuyuki c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Nagasaku, Shigeo c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Application Number:
PCT/JP2002/003587
Publication Date:
October 24, 2002
Filing Date:
April 11, 2002
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Goto, Kunio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Matsumoto, Keishi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Nakasuji, Kazuyuki c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
Nagasaku, Shigeo c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka, 541-0041, JP)
International Classes:
F16L15/00; C10M103/02; C10M103/04; C10M103/06; C10M107/38; C23C24/08; C23C26/00; C23C28/00; C23C30/00; F16L15/04; F16L58/10; F16L58/18; E21B17/042; (IPC1-7): F16L15/00
Domestic Patent References:
1996-04-11
Foreign References:
JP2001065753A2001-03-16
JPH01219173A1989-09-01
JPS61136087A1986-06-23
JPH0559387A1993-03-09
JPH06228583A1994-08-16
Other References:
See also references of EP 1378698A1
Attorney, Agent or Firm:
Hirose, Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chom, Chuo-ku Tokyo, 103-0023, JP)
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