Abstract: It is an object to provide a method for producing a member for a molten metal bath which is less likely to form minute cracks and pores in a pores-sealing coating film, and to provide a method for producing a member for a molten metal bath which can restrain adhesion of an alloy such as dross. The method for producing a member for a molten metal bath is characterized by applying or spraying, to a cermet thermal spray coating film formed on a base material or an oxide-based ceramic thermal spray coating film formed on a base material, a mixed solution obtained by adding aluminum dihydrogen phosphate and inorganic particles having a layered hexagonal crystal structure to a silica sol solution as a solution for sealing pores of the thermal spray coating film, and firing the mixed solution which is applied or sprayed to the thermal spray coating film.

Abstract: The in-bath roll used in a metal bath containing Al includes: an undercoat layer formed on a roll surface, the undercoat layer being formed by a cermet thermal spray coating film containing a first boride containing at least WB, WCoB, W2CoB2, a second boride composed of at least one kind of Cr, Zr, and Ti borides, and a balance composed of a cobalt-based alloy not containing nickel of 5% by mass or more; a topcoat layer formed on a surface of the undercoat layer, the topcoat layer being formed by a ceramic thermal spray coating film containing at least ZrO2 and Y2O3; and a friction reducing layer formed on a surface of the topcoat layer, the friction reducing layer being composed of BN and at least one kind of TiO2, ZrO2, SiO2, MgO, and CaO.

Abstract: A hearth roll for heat treatment furnaces has excellent build-up resistance, has a hexavalent-chromium-free thermal spray coating film formed on the roll surface thereof and is safe for the environment. A method for manufacturing a hearth roll for continuous annealing furnaces includes a first step of applying an aqueous solution containing chromium phosphate onto a thermal spray coating film formed on the roll surface of a hearth roll or impregnating the thermal spray coating film with the aqueous solution; and a second step of burning the hearth roll.

Abstract: In rolls of winding equipment in a hot-rolling factory, each roll includes a lower cladding layer formed on the surface of the roll barrel and a self-fluxing alloy layer formed on the lower cladding layer by thermal spraying and containing carbide particles dispersed therein. The lower cladding layer includes an Fe-based cladding layer which has a Shore hardness of 60 or greater and which contains, in terms of mass %, 0.1-0.4 C, up to 2.0 Si, up to 3.0 Mn, 1.0-15.0 Cr, and 2.5-5.0 Ni. The lower cladding layer further contains one or more of Mo, V, and Co, the contents of Mo, V, and Co being 0.1-5.0 mass %, 0.1-3.0 mass %, and 0.5-5.0 mass %, respectively.

Abstract: A roll for winding equipment in a hot rolling factory is obtained by forming a base build-up layer on the surface of the body of the roll and forming on the base build-up layer a self-fluxing alloy thermal spraying layer, in which carbide particles are dispersed. The base build-up layer has a Shore hardness of 60 or higher and includes an iron-based build-up layer that contains, in terms of mass %, 0.4-1.0% of C, 2.0% or less of Si, 3.0% or less of Mn, 1.0-15.0% of Cr and 0.5-5.0% of Nb.

Abstract: A cermet thermal spray powder generates a dense sprayed coating with superior wear resistance, superior toughness, superior resistance to molten metal, and superior resistance to thermal shock. The cermet thermal spray powder is sprayed onto a surface of a roller for a molten metal plating bath, wherein the powder includes: a first boride including W; a second boride including Cr; binder alloy particles including at least W, Cr, and Co; and unavoidable impurities; the content of B being 4.5% by mass to 8.5% by mass and the content of W being 50% by mass to 85% by mass with respect to 100% by mass of the cermet thermal spray powder.

Abstract: A cermet thermal spray powder generates a dense sprayed coating with superior wear resistance, superior toughness, superior resistance to molten metal, and superior resistance to thermal shock. The cermet thermal spray powder is sprayed onto a surface of a roller for a molten metal plating bath, wherein the powder includes: a first boride including W; a second boride including Cr; binder alloy particles including at least W, Cr, and Co; and unavoidable impurities; the content of B being 4.5% by mass to 8.5% by mass and the content of W being 50% by mass to 85% by mass with respect to 100% by mass of the cermet thermal spray powder.