Nippon Steel Hardfacing Co., Ltd.

Munetoshi Hiroshige

Kiyohiro Tarumi

Takao Sato

In a method for manufacturing a member for use in a molten metal bath, a sealing solution is applied on a coating formed of oxide system ceramics formed on an outermost surface of a substrate. The sealing solution includes an inorganic colloid compound solution containing an inorganic colloid having a grain diameter in a range of 5-50 nanometers in an amount of 5-50 weight percent, and an inorganic binder. The inorganic binder is mixed at a weight ratio of 0.3-3.0 with respect to a weight of 1.0 of the inorganic colloid. The oxide system ceramic formed on the outermost surface of the substrate is an oxide containing 5% or more of a composite oxide comprising (a) at least one of Al, Ti, V, Cr, Fe, Co, Rh, In and rare earths, which are trivalent metal elements, and (b) at least one rare earth different from that used in (a). The sealing solution on the coating after permeation is then baked.

Method for producing member for molten metal bath having coating film excellent in resistance to corrosion by molten metal

A member for a molten metal bath is provided with a composite sprayed coating having excellent corrosion resistance and peeling resistance against a molten metal. A cermet sprayed coating lower layer including 5-60% by weight of metal boride and 5-30% by weight of at least one member selected from the group consisting of Co, Cr, Mo, and W with the balance including metal carbide and unavoidable impurities is formed on a surface of a member for the molten metal bath such as a roll in a bath, and an oxide ceramic sprayed coating surface layer including combined various oxides is formed on the cermet coating. The obtained composite coating is subjected to sealing treatment by means of an inorganic sealing agent.

Member for molten metal bath, provided with composite sprayed coating having excellent corrosion resistance and peeling resistance against molten metal

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Tokyo, Japan

Munetoshi Hiroshige