CONTINUOUS HEAT TREATMENT FURNACE FOR PREVENTING THERMAL DEFORMATION OF COOLING ZONE ROLL

摘要

PURPOSE:To make temp. difference in longitudinal direction of a supporting roll little and to prevent damage of a steel strip caused by thermal deformation of the roll by arranging a parting wall having slit-like steel strip passage between cooling chamber and supporting roll chamber of the steel strip in a continuous heat treatment furnace for steel strip and making radiation ratio in inner wall of the supporting roll chamber less than the specific value. CONSTITUTION:The cooling chamber 11 and the roll chamber 13 arranged with the supporting roll 14 for changing direction of the steel strip 16 in the continuous heat treatment furnace for steel strip 16 are divided with a parting wall 12, and the narrow slit-like passage 15 for passing through the steel strip 16 is arranged to the parting wall 12. Further by lining stainless steel plate, etc., to inner wall 17 in the roll chamber 13 to make =0.3 the radiation ratio, loss of heat conducting the inner wall in the roll chamber is restrained and discharge of the heat through atmospheric gas from the slit-like passage 15 is restrained. By making little the temp. difference between both end parts of the supporting roll 14 without contact with the steel strip 16 and the center part thereof in contact with the high temp. steel strip 16, the steel strip is prevented from meandering and developing buckling causing wrinkle caused by deformation in longitudinal direction of the supporting roll 14.