THREADED JOINT FOR STEEL TUBE - SUMITOMO METAL IND

Title:

THREADED JOINT FOR STEEL TUBE

Document Type and Number:

WIPO Patent Application WO/2003/010460

Kind Code:

A1

Abstract:

A metal−sealable threaded joint for steel tube capable of being tightened and loosened repeatedly without applying liquid lubricant containing heavy metal powder thereon, comprising a pin and a box each having a contact surface containing a screw part and a screw−less metal contact part, wherein the contact surface of at least one of the pin and box is covered with a surface prepared layer and a lubrication film layer covered thereon, the surface prepared layer should desirably be a porous metallic layer of Hv 50 to 250 having a porosity of 5 to 80% and a thickness of 1 to 30 μm, and the lubrication film layer is formed of a solid lubrication film or a liquid lubrication film not containing substantially heavy metal powder, and the total of the thicknesses of the surface prepared layer and the lubrication film layer is 100 μm or less.

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Inventors:

ANRAKU TOSHIRO (JP)
GOTO KUNIO (JP)
MATSUMOTO KEISHI (JP)
NAGASAKU SHIGEO (JP)

Application Number:

PCT/JP2002/007355

Publication Date:

February 06, 2003

Filing Date:

July 19, 2002

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
ANRAKU TOSHIRO (JP)
GOTO KUNIO (JP)
MATSUMOTO KEISHI (JP)
NAGASAKU SHIGEO (JP)

International Classes:

F16L15/04; C10M109/02; C10M159/24; C10M169/04; C10M171/00; C23C4/04; C25D15/02; F16L15/00; (IPC1-7): F16L15/00

Domestic Patent References:

WO1996010710A1

1996-04-11

Foreign References:

JPS62258283A	1987-11-10
JPS63270477A	1988-11-08
JPS60121385A	1985-06-28
US4893658A	1990-01-16
JPH0972467A	1997-03-18

Other References: