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We substantiate the possibility of application of the method of electric-spark alloying of the surface layers of 40Kh steel by electrodes made of Т15К6 and VK8 hard alloys for the purposes of hardening of the working surfaces of elements of the drilling equipment. It is shown that, as a result of local electric discharges between the cathode and the anode, the surface layers can be alloyed with Co,...