... in their processing, including heat treatment, transverse bending straightening, hole boring and honing, allowing to achieve the straightness level within 0.1 mm (0,0039 inch) on 1.0 m (3 7/25 ft) length after the completive operation of ionic-vacuum nitriding in pulse plasma without further processing. There are elaborated technological processes of hardening by ionic-vacuum nitriding in pulse plasma for high-loaded threaded surfaces of drill pipe and tubing subs, increasing their operational life ...

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