Nippon Steel Hardfacing Co., Ltd.

Junichi Yasuoka

Takao Sato

Kiyohiro Tarumi

Tatsuhiro Shigemitsu

Yuusei Michikata

Yoshihisa Horie

The hearth roll includes a thermally sprayed coating formed on the surface thereof. The thermally sprayed coating includes a nitride, an oxide, or a multiple oxide, and a matrix material composed of one or two or more metals. In the hearth roll having high Mn build-up resistance, the following expressions are satisfied: 3% by volume&#x2266;X&#x2266;50% by volume; 3% by volume&#x2266;X&#x2266;50% by volume; and 40% by volume&#x2266;X+X&#x2266;80% by volume, in which Xis the percentage by volume of the nitride contained in the thermally sprayed coating with respect to the total volume (10% by volume) of the thermally sprayed coating, and Xis the percentage by volume of the oxide or the multiple oxide contained in the thermally sprayed coating with respect to the total volume of the thermally sprayed coating.

Hearth roll having high Mn build-up resistance

A member having a coating film is formed by thermal spraying a thermal spray material. The thermal spray material includes a double oxide forming a monophasic oxide, and contains (a) at least one trivalent metal element selected from the group consisting of Al, Ti, V, Cr, Co, Rh, and Sc, Y and lanthanoid in rare earth elements, and (b) at least one element selected from the group consisting of Sc, Y, and lanthanoid in the rare earth elements different from those in (a).

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Tokyo, Japan

Junichi Yasuoka