Abstract
Hearth rolls used in continuous annealing furnace for producing thin steel sheet, generally coated by thermal spraying's applied. The surface coating on the hearth roll needs enough adhesion and wear resistance. In this study we focus on the intensity of the singular stress appearing at the end of the JIS specimen used to investigate thermal shock strength. Then, we discuss the effect of thickness of the coat and the bond coat as well as the effect of material property on the intensity. It is found that with decreasing Y_2O_3 contents of the ceramic coat the intensity decreases.
