MEMBER FOR MOLTEN METAL BATH, PROVIDED WITH COMPOSITE SPRAYED COATING HAVING EXCELLENT CORROSION RESISTANCE AND PEELING RESISTANCE AGAINST MOLTEN METAL

摘要

A member for a molten metal bath, provided with a composite sprayed coating possessing excellent corrosion resistance and peeling resistance against a molten metal. A substrate layer for a cermet sprayed coating comprising 5 to 60 % by weight of a metal boride and 5 to 30 % by weight of at least one member selected from among Co, Cr, Mo, and W with the balance consisting of a metal carbide and unavoidable impurities is formed on the surface of a member for a molten metal bath, such as a roll to be used in the state of submersion in a bath, and an oxide ceramic sprayed coating surface layer comprising a combination of various oxides is formed on the coating, followed by sealing of the composite coating with an inorganic sealing agent.