THERMAL SPRAYING MATERIAL AND HEARTH ROLL

摘要

Disclosed is a hearth roll having excellent build-up resistance against an Mn-containing substance, excellent thermal shock resistance, excellent wear resistance and a long lifetime. Specifically disclosed is a thermal spraying material to be thermally sprayed on the surface of a hearth roll. The thermal spraying material comprises: a heat-resistant metal (including an alloy) which contains Al and can be used at a temperature equal to or higher than 900°C; and an oxide composed of a rare earth element (Sc, Y, lanthanum and lanthanoid) and oxygen, wherein the content of Al (A) (mole) and the content of the rare earth element (Sc, Y, lanthanum and lanthanoid) (B) (mole) fulfill the requirement represented by the following formula: 0.3 = (A/B) = 4.0.