| 摘要 |
PURPOSE:To produce thick plates of high quality free from porosity defects by rolling down a material to be rolled in the thick wall direction thereof with a forging press just prior to rolling on the inlet side of a mill line for thick plate rolling mills. CONSTITUTION:In the stage of rolling thick plates at a low cost by using the slabs produced by a continuous casting method as material, the slab is heated in a heating furnace 1 and is then passed through a scale breaking device 2 whereby the scale on the surface is removed. After the descaled slab is subjected to rolling reduction repeatedly at every longitudinal segment with a forging press 3 provided with anvils over the entire width in the thick wall direction thereof, the slab is passed through rolling mills 4 and is finished to a thick plate material via broadside rolling pass, thickness reducing pass and shaping pass. The generation of porosity defects in the thick plate material is prevented by disposing the forging press which rolls down the material in the thick wall direction thereof on the inlet line of the mill line for rolling mills in the above-mentioned way. |
