1880轧机机架间冷却水对热轧高强钢精轧轧制力的影响

EFFECT OF COOLING WATER BETWEEN 1880 ROLLING MILLS ON ROLLING FORCE OF FINISHING MILL FOR HIGH STRENGTH STEEL

由于热轧高强钢在精轧过程中变形抗力大,常规的温度控制模型虽然能够有效保证终轧温度精度,但因热轧高强钢一般采用高出炉温度、低终轧温度的轧制工艺,机架水参与反馈容易造成前机架变形抗力增加并由此造成精轧边损、轧破、甩尾等一系列质量问题,严重时甚至造成废钢。为此,通过分析精轧轧制力和温度的关系,采用了低穿带速度、低加速度同时轧制过程中后机架无机架水参与设定和反馈的轧制方式,尽管终轧温度精度较之前有所降低,但有效地解决了因轧制力较大造成的轧制不稳定等问题。通过对薄规格高强钢热轧工艺的调整和优化,实现了1 880 mm产线批量稳定生产高强钢的目的,提高了宝钢产品的覆盖面和竞争力。

Traditional temperature control model could get high finishing delivery temperature （FDT） accuracy for high strength steel with high deformation resistance. However, the high discharge temperature along with low aim FDT made the edge damage occurred at a relatively high frequency during finishing mill rolling process. After analyzing the relationship of temperature and rolling force, the problem could be solved by using low thread-speed and no inter-stand water in FDT control procedure. Although the FDT accuracy decreased relatively, the finishing mill rolling process became stable after such adjustment. The optimization in high strength steel did not only improve the quality but also competency of the Baosteel products.