Electroerosion processing, electrospark coating and other electronically processing technologies is created and developed in XX century [1]. However, and today without these technologies progress and overall technological progress is inconceivable. Carbonization of steel with graphite electrode by arc essence is that strengthening steel surface by few hertz frequency firing and extinguishing electrical arc (further vibroarc). Carbon during electrode disintegration diffuses into the steel surface. Because of rapid cooling surface gets tampered and in that way increasing hardness, wear resistance and other important exploitation properties. The aim of this work: in mild steel surface with vibroarc develop abrasive wear resistance layers and perform their evaluation. For surface strengthening was used two technologies: 1. Steel Hardox 400 surface carbonization with graphite electrode by arc; 2. Steel Hardox 400 surface processing with graphite electrode by arc, performed through layer created paste-like coating what consists of metal (nickel based welding powder PG10 and aluminum powder), ceramics (aluminum oxide, wolfram carbide and other), flux (made from molten glass, natrium borax [Na2B4O7·10H2O] and other). 80 – 120 A current vibroarc increasing surface roughness, hardness while arc between graphite electrode and metal, through additional substance, it melts, forms rough composition layer up to 0.4 – 0.8 mm thickness. Welded and strengthened steel Hardox 400 layer evaluation was performed with hardness tester PMT–3, scanning electron microscope JEOL JSM-5600, detector for high resolution X-ray spectroscopy and microanalysis Bruker XFlash 4030. Abrasive wear resistance research was performed follow ASTM G65 with rubber wheel and wear by fixed abrasive follow ASTM G13296 (Non-Rotating Pin-on-Drum Test Method). The results show that: 1. Steel surface strengthening with graphite electrode advisable by low abrasive contact pressures; 2. Steel surface strengthening by forming compositional layer by wear in fixed abrasive.