| 摘要 |
PURPOSE:To perform two steps continuous heating with low cost wihtout deteriorating productivity, by performing preheating in a recuperative furnace provided just after a continuous casting equipment, and rising the temp. of slab in succeeding heat furnace. CONSTITUTION:The slab 4 is cast by the continuous casting equipment 11, cut by a gas cutter 12, etc., then charged into the recuperative furnace 14 as it is at high temp. The charged slab 4-1 is preheated to a suitable temp. of >=about 700 deg.C-<=AC3 transformation point, and held at the temp. for a fixed time or more. Next, said slab is carried directly to a slab heating furnace 1 of next process without being cooled to normal temp. The slab 4-2 charged in the furnace 1 is heated continuously to the temp. suitable to rolling, then extracted and sent to a hot rolling mill 10, etc. |
