METHOD FOR HEAT INSULATION IN DIRECT FEED ROLLING OF STEEL MATERIAL

PURPOSE:To obtain a uniform strip edge temp. in direct feed rolling which rolls a continuous casting ingot to a strip without heating the same by maintaining beforehand the side surface parts in the longitudinal direction of a slab corresponding to the coldest point temp. part of the strip beforehand at the temp. higher than the temps. in the other parts from the stage of the slab. CONSTITUTION:In direct feed rolling wherein a continuously cast ingot is rolled to a strip without heating, heat insulating materials 8 are adhered over the entire width on the side surfaces of a slab 11 in the positions corresponding to the coldest points at the preceding and succeeding ends of the strip in the longitudinal direction thereof, that is, over the length 0.2L from the position where the length 0.1L is subtracted from the preceding end of the slab when the overall length of the slab 11 is defined as L and over the length 0.2L from the succeeding end of the slub 1. The slab is thereafter supplied to hot rolling mills. The materials 8 are moved horizontally by the operations of the arms 9 carrying said heat insulating materials at their forward ends and cylinders 10, whereby the heat insulating materials are adhered on the side surfaces of the slab 11.