Patent ID: 8852066

Claim:
A hearth roll having high Mn build-up resistance, the hearth roll comprising a thermally sprayed coating formed on a surface thereof, wherein the thermally sprayed coating includes a nitride of one element selected from the group consisting of Ti, Nb, Ta, Cr, and Fe, an oxide of one element selected from the group consisting of Y, Ce, Nd, Al, and Cr or a multiple oxide of two or more of the elements, and a matrix metal composed of one or two or more metals selected from the group consisting of refractory metals usable at 900° C. or higher, and wherein the following conditional expressions (1) to (3) are satisfied: 3% by volume≦ X 1 ≦50% by volume; (1) 3% by volume≦ X 2 ≦50% by volume; and (2) 40% by volume≦ X 1 +X 2 ≦80% by volume; (3) in which X 1 is the percentage by volume of the nitride contained in the thermally sprayed coating with respect to the total volume (100% by volume) of the thermally sprayed coating, and X 2 is the percentage by volume of the oxide or the multiple oxide contained in the thermally sprayed coating with respect to the total volume (100% by volume) of the thermally sprayed coating.