| 摘要 |
PURPOSE:To obtain a steel plate having excellent internal soundness by executing rapping right after the solidification of a molten steel poured into a casting mold and subjecting the steel ingot to light reduction by a planar pressurizing device having a pair of upper and lower parallel pressurizing surfaces, then to hot rolling. CONSTITUTION:Rapping is executed right after the solidification of the molten steel and the steel ingot 1 is placed horizontally and is subjected to light reduction by the planar pressurizing device 2 disposed above and below the ingot. In this case, the length L of the pressurizing surfaces of the device 2 is required to satisfy L/t>=1.0. The ingot is thereafter subjected to hot rolling, by which the internal soundness is assured and the deformation of the steel ingot is obviated. |
