METALLIC SHEET FOR LINING FOR HIGH TEMPERATURE ATMOSPHERIC FURNACE

PURPOSE: To produce a metallic sheet for lining for a high temp. atmospheric furnace by forming an aluminum penetration layer of specific concentration and penetration thickness on the surface of a stainless steel sheet. CONSTITUTION: For example, aluminum is diffused and penetrated into the surface of SUS430, as ferritic stainless steel sheet, of 1mm thickness so that maximum aluminum concentration becomes about 30% and the thickness of each penetration layer is regulated to a value about 20% of sheet thickness from both side surfaces. The surface of a ceramic fiber applicated body in the heating and the soaking zone of a vertical continuous annealing furnace is coated with that stainless steel sheet by using a stud pin. An aluminum concentration of 15wt.% suffices as the maximum aluminum concentration per side of the surfaces, and it is preferable to regulate penetration thickness per side of the surfaces to a value >=10% of the thickness of the stainless steel sheet. A martensitic stainless steel sheet can also be used as the stainless steel sheet. By this method, oxidation resistance and thermal deformation, under high temp. atmosphere, can be improved.