ROLLING METHOD THROUGH CONTINUOUS HOT ROLLING LINE

PROBLEM TO BE SOLVED: To provide a method of manufacturing a steel sheet of good workability and with a good yield at a low cost without breakage of the joint portion through a continuous hot rolling line. SOLUTION: In the continuous hot rolling line where steel materials heated in a heating furnace are rough-rolled into sheet bars, and the front end of the following sheet bar is joined to the rear end of the preceding sheet bar and then finish-rolling is done while tension is applied with a finish-rolling mill, the tension of lower than 1 kgf/mm2 is applied until the bar thickness ratio becomes 25 to 35% and subsequently the tension of 1 to 4 kgf/mm2 is applied with the finish-rolling mill.