CONNECTION OF CORROSION-RESISTANT CASING OR LIFTING PIPES AND METHOD OF CONNECTION FABRICATION Russian patent published in 2010 - IPC F16L58/08 F16L15/08 

FIELD: machine building.

SUBSTANCE: invention refers to drilling equipment. At least one of conjugated surfaces in the connection of corrosion resistant casing or lifting pipes out of steel with contents of chromium to 3…20 % has zinc coating applied by the method of thermo-diffusion powder zinc plating; also coating contains chromium at amount 2…9 % by weight, summary thickness of coating on conjugated parts is within ranges 15…5 0 mcm at minimal thickness of coating 15 mcm, while micro-hardness of coating exceeds micro-hardness of material of connected parts by 1.5…2.2 times. The method of fabrication of parts of the said connection consists in applying zinc coating on one of the conjugated surfaces by the method of thermo-diffusion zinc-plating; also the process is carried on till contents of chromium in coating reaches 2…9 % by weight at summary thickness of coating on conjugated parts within ranges 15…50 mcm and minimal thickness of coating 15 mcm.

EFFECT: increased efficiency of method of fabrication of connection parts.

5 cl