Increasing of the durability of universal steel drill pipes by finishing electromechanical surface hardening

The results of bench tests of universal steel drill pipes (USDP) after laser hardening, carbonitriding and final electromechanical surface hardening (EMSH) are presented. The structure and hardness of the external and internal conicalmetric lock threads of З-53 and З-57 nipples and pipe couplings after EMSH are investigated. Keywords hardening, drill pipe, thread, wear, structure, hardness, electromechanical treatment [email protected], [email protected]