Threaded pipe with surface treatment

摘要

A threaded metallic pipe for oil extraction industry has a threaded end portion with treated surface in which the metal surface has a roughness (Ra) comprised of 2.0 mum and 6.0 mum, which is covered by a uniform layer ( 7 ) of a dry corrosion inhibiting coating and a second uniform layer ( 8 ) of dry lubricant coating. Alternatively the layers ( 8, 9 ) combined into one uniform layer ( 9 ) of a dry corrosion inhibiting coating containing a dispersion of particles of solid lubricant.