| 摘要 |
PURPOSE:To improve the efficiency of continuous hot rolling and to improve the productivity and yield thereof by butting the end parts of thick walled steel materials on the slopes thereof, welding part of the joint surface part where rolling tension is generated and hot rolling the materials. CONSTITUTION:Approximately equally walled end faces of thick-walled steel materials 11, 12 having 30-250mm. thickness are butted on the slopes 13 having the angle at which said end faces can be engaged with each other and part of the joint surface part 14 where tension is generated during rolling is welded to the depth tw of >=1/10 the thickness t0. If the materials are hot rolled 15 in this state, the materials are satisfactorily and continuously rolled, by which the production efficiency is improved and productivity and yield are improved. |
