HEARTH ROLL FOR CONTINUOUS ANNEALING FURNACE AND PROCESS FOR PRODUCTION OF THE SAME

摘要

A hearth roll for a continuous annealing furnace able to suppress the occurrence of buildup on the hearth roll surface and able to be stably used for a long period under the high temperature environment in a continuous annealing furnace and a method of production of the same are provided. The hearth roll for a continuous annealing furnace has a cermet coating comprised 50 to 90 vol% of ceramic and the balance of a heat resistant alloy on its surface, the ceramic containing Cr 3 C 2 : over 50 to 90 vol%, Al 2 O 3 : 1 to 40 vol%, Y 2 O 3 : 0 to 3 vol%, and ZrB 2 : 0 to 40 vol% and having a balance of unavoidable impurities and pores, the heat resistant alloy containing Cr: 5 to 20 mass%, Al: 5 to 20 mass%, and one or both of Y and Si: 0.1 to 6 mass% and has a balance of one or both of Co and Ni and unavoidable impurities.