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One of the most important hardening methods of tool steel is the use of carbide coatings. During this process, vanadium atoms diffuse the specimen’s surface at high temperature and reacts with the available carbon in steel and create vanadium carbide with high hardness. During the plasma electrolytic saturation (PES) process, the vanadium element diffuses with the help of plasma and increases up to around 950[Formula: see text] as a result of the temperature, providing conditions for the creation of vanadium carbide. The best combination of electrolyte is 4[Formula: see text]g vanadium oxide and 50[Formula: see text]mL hydrochloric acid and different concern of sodium hydroxide. The results indicate that the formed coating is about 30[Formula: see text][Formula: see text]m. As the conductivity increases, the condition for diffusion is provided; however, with increase in the temperature, the diffusion decreases. The coating formation is observed in the current at 9–11 A and hardness of this coating is about 1400[Formula: see text]vickers.