| 摘要 |
PURPOSE:To reduce rolling pass times and to improve productivity by cutting an intermediate blank material obtained by primary rolling of a slab to plural pieces in its longitudinal direction and forming these to products in succession. CONSTITUTION:A prescribed slab is obtained from steel making then through ingot making, blooming and continuous casting. This slab is subjected to primary rolling down to a prescribed intermediate thickness, whereby an intermediate blank material is obtained. This blandk material is heated and cut along its longitudinal direction, whereby plural pieces of square materials are formed. These square materials are subjected to secondary and finish rolling, whereby steel bars are obtained. Otherwise, the intermediate blank material formed by primary rolling the slab more thinly than said intermediate blank material is cut in its longitudinal direction to form plural pieces of square materials which are directly finish rolled by omitting the secondary rolling. In this way, the steel bars are obtained with less number of passes and productivity is improved. |
