It's a kind of self consumption electrode taking advantage if heat energy produced by remelting furnace to smelt and insert into slag pool. Metal molten droplets washed by slag liquid crystallize to a special kind of electro slag ingot smelting equipment in the water cooling crystallizer. Because of slag liquid's eliminating impurity function and fine conditions of crystallization, electro slag remelting metals have fine performance: well degree of purity, fine equal cast structure, no fish eyes and segregation, low sulfur content, tiny and fine distribution inclusions. Therefore, electro slag remelting is in the monopoly position in the production of large and medium forgings and module and semi finished materials. It is dominant in the high quality of mould steels, maraging steel, dual-phase steel billets and cold roll steel electro slag. It has special place in the electro slag odd shaped parts.