Threaded joint for steel pipe

Details Threaded joint for steel pipe Threaded joint for steel pipe

2011-01-11

2011-01-11

Hewitt, James M (Department: 3679)

Pipe joints or couplings

With lubrication

C285S333000, C285S390000

Reexamination Certificate

active

07866706

ABSTRACT:
A threaded joint for a steel pipe comprises a pin and a box with a contact surface having a threaded part and a unthreaded metal contact part, wherein a solid lubricating film containing one or more kinds of lubricating powders selected from graphite, mica, calcium carbonate and kaolin, a copper powder, and a binder is formed on at least one contact surface of the pin and the box. An object of the present invention is to provide a threaded joint for a steel pipe which allows for repeated fastening and loosening of a threaded joint without adversely influencing on a human body and environment, and is excellent in galling resistance, rust preventing property and gas tightness.

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