FIELD: different industries; methods of manufacture of the spindles out of the steel for the pipeline fittings.
SUBSTANCE: the invention is pertaining to the method of manufacture of the pipeline fittings, in particular, the spindles, shutters and valves for shutting and control of consumption off the mediums passing through the pipelines. The method includes the thermal treatment and the mechanical working with formation of the threading. After the mechanical working exercise nitriding by the vacuum ion-implantation method at the temperature of T = (320-450)°С, the voltage - U = (250 - 750)V and during the time t = (20-60) minutes. The technical result consists in the increased reliability and the service life of the pipeline fittings.
EFFECT: the invention ensures the increased reliability and the service life of the pipeline fittings.
3 cl, 1 ex, 2 dwg
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