| 摘要 |
PURPOSE:To obtain the titled hearth roll by forming a heat resistant coated layer contg. a restricted amount of SiO2 and having a specified thickness on the surface of a hearth roll by spraying. CONSTITUTION:A hearth roll made of heat resistant steel is coated with a coating material consisting of >=40% SiO2 and the balance Co, Cr, Y, Ni, Mo, Al, Zr or other metal with wear resistance at high temp. and/or oxide thereof by spraying to form a layer having 0.05-1.2mm. thickness. The layer may be impregnated with chromic acid and calcined to improve further the wear resistance and build-up resistance. |
