FIELD: ferrous and nonferrous metallurgy. SUBSTANCE: introduced into coating composition is carbon powder, and finely divided high-alumina material as refractory component instead of calcium salts with the following content of components, mas. % : finely divided high-alumina material 25-60; carbon powder 5-6; orthophosphoric acid is the balance. Provision is made for use alumina, kaolin, bauxite as high-alumina material, and graphite concentrate of GT-3 grade, dust of electrostatic precipitation of graphite electrode production as carbon powder. Particle sizes of above materials should be within 0.08 mm. EFFECT: higher efficiency. 7 cl, 1 tbl
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