HEARTH ROLL HAVING EXCELLENT MN BUILD-UP RESISTANCE, THERMAL SHOCK RESISTANCE AND WEAR RESISTANCE, AND THERMAL SPRAYING MATERIAL FOR THE SAME

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 a multiple oxide of at least one metal selected from rare earth elements (Sc, Y, lanthanum and lanthanoid), metals belonging to Group 3A on the periodic table and transition metals excluding Zr, Hf and Fe, wherein the content of Al (A) (mole) and the content of the rare earth clement (Sc, Y, lanthanum and lanthanoid) (B) (mole) fulfill the requirement represented by the following formula: 0.3≦̸(A/B)≦̸4.0.