国丰热轧薄规格窄带钢生产实践

PRODUCTION PRACTICE OF HOT-ROLLED THIN GAUGE NARROW STRIP IN GUOFENG

详细介绍了唐山国丰薄板厂620窄带生产线的设备技术参数及轧制工艺。对轧制薄规格带钢过程中的温度控制、轧制过渡、板型控制、头部温降控制、甩尾、飘钢、轧烂等问题进行了重点提示。针对轧制薄规格带钢时容易出现的折印、中间浪、折边、混晶缺陷提出了应对措施。实践证明:轧薄需要足够的功率和良好稳定的轧制设备;板型控制是轧薄的关键;轧薄容易出现的折印、中间浪、混晶、折边缺陷中,折印普遍存在屈服强度低的带钢表面,且热轧不能消除,中间浪、混晶、折边可以通过针对性的措施消除。

The technical parameters and rolling process of 620 narrowstrip production line in Tangshan Guofeng strip mill are introduced in details.This paper focuses on the temperature control,rolling transition,shape control,head temperature drop control,tail flick,etc Some countermeasures are put forward for the defects of cross break,middle waves,folding and mixed-phase during the rolling process.It is proved that shape control is the key of sheet rolling which needs sufficient power and stable rolling equipment.As for the above defects,cross break is generally found on the strip surface with lowyield strength,which cannot be eliminated by hot rolling; middle waves,folding and mixed-phase can be eliminated through targeted measures.