The draught pressure and production capacity of three-high Lauth roughing mill in the medium plate rolling mill Jinan Iron and Steel Company is very low.

• 济钢中板厂三辊劳特式粗轧机轧制力小,生产能力低,已经不能满足公司进一步发展的需要,因此必须进行改造。本次改造采取不停产改造方式,将三辊轧机改为四辊轧机。