我厂有Φ400×3/Φ300×3小型轧机两列,使用90～150mm方坯,主要产品为16～20×70～150mm的扁坯(1/2～1 1/2″焊管用坯)。建厂二十年来一直没有进展。计划生产大口径(如2″以上)焊管,但受到轧机能力的限制,不能吃更大尺寸的方坯,所得扁坯宽度达不到20×160mm以上的要求。1984年4月,在现有设备不作大的改动情况下,将工艺和 I plant Φ400 × 3 / Φ300 × 3 small mill two columns, the use of 90 ~ 150mm billet, the main products for the 16 ~ 20 × 70 ~ 150mm of the slab (1/2 ~ 1 1/2 “pipe blank). There has been no progress in the construction of the plant over the past 20 years, and it is planned to produce welded pipes with large caliber (such as above 2 ”), but it is limited by mill capacity and can not eat larger billet, and the obtained slab width can not exceed 20 × 160mm . April 1984, in the case of existing equipment without major changes, the process and technology