To provide a rough-rolling method of a bar steel whose rolling crack at the inner and the outer parts is hardly generated by using flat rolls, even when a continuously cast billet is directly fed into a rolling line without cooling and continuously rolling after welding the cast billets.
In the continuous rolling of the bar steel continuously rolled after welding the cast billet, when the bar steel is produced with the rolling by directly feeding the continuously cast billet, this rolling method is executed by using the continuously cast billet having the round cross section, and using caliber rolls at the first pass for rough rolled forming pass and the flat rolls on and after the second pass for rougher roll. This rolling method has the peculiarity, in which the pushing force is loaded to the cast billet at the inlet side of the first pass for rough rolled forming pass to prevent the rolling crack in the continuously cast billet.
AZUMA SHOZO
ARIIZUMI TAKASHI
OKAWA SUSUMU
WAKASA HIROSHI
