Mannesmann Aktiengesellschaft

Hans Hubecker

Friedrich Lenze

Gerhard Missaire

The surfaces of threads, sealing surfaces, and other load-bearing surfaces of oil field tubes or the like are treated by blasting surfaces to increase the roughness thereof to obtain a roughness of an average depth of from 7 to 15 micrometers under utilization of corundum or silicon carbide at a grain size of from 40 micrometers to 200 micrometers; a resin varnish is deposited onto the blasted surface for curing at higher than room temperature and including molybdenum sulfide at a layer thickness of from 5 to 20 micrometers. The varnish is cured in situ by heating.

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Dusseldorf, Germany

Hans Hubecker