PRODUCTION OF BASE SHEET FOR SURFACE TREATED STEEL SHEET AND PRODUCING INSTALLATION THEREOF

PURPOSE:To prevent jumping and to stabilize temper rolling by subjecting a steel sheet formed by cold rolling and continuous annealing to working to suppress yield elongation in tension then to wet temper rolling. CONSTITUTION:The base sheet S for the surface treated steel sheet subjected to prescribed treatments in devices including a cleaning device is subjected to the prescribed heat treatment such as heating-holding-cooling in an annealing furnace 2. The sheet is thereafter passed through an outlet side looper 3 and is engaged with a yield elongation suppressing device 1 as represented by a wet temper rolling mill, by which the sheet is subjected to the necessary working to suppress the yield elongation in tension. The sheet is then subjected to the temper rolling by the wet temper rolling mill 5 to obtain the prescribed degree of tempering. The yield elongation suppressing device of any type including the type to execute tensile working or the type to execute rolling may be used. The jumping is thus thoroughly prevented and the stable temper rolling is made possible.