Chrome-nickel presence in a surface layer provides longer terms of carbonaceous steel details operation. The research results of conditions of 45 steel chrome-nickel electrospark coverings formation are presented in the article. It is determined, that the coverings heat resistance depends not only on the alloying mode, but also on the chrome-nickel ratio in anode materials. The thickness of pure metal coverings is less than in the researched alloys, as iron presence provides bigger covering adhesion due to the mutual solubility of anode and cathode materials. The solidity, porosity and roughness of the received electrospark coverings are investigated. The coverings phase composition and changes during electrospark alloying in the anode materials surface layer were determined with the X-ray structural method.