Heat Treatment of Metals ›› 2022, Vol. 47 ›› Issue (11): 230-237.DOI: 10.13251/j.issn.0254-6051.2022.11.040

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Research progress of annealed strip flatness optimization technology for cold-rolled ultra-high-strength steel

Zhang Liyang1,2, Wan Zhaotang2, Zhang Wenjun3   

  1. 1. Cold Rolling Plant of Baoshan Iron & Steel Co., Ltd., Shanghai 200941, China;
    2. Cold Rolling Plant of Zhanjiang Iron & Steel Co., Ltd., Zhanjiang Guangdong 524072, China;
    3. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao Hebei 066004, China
  • Received:2022-06-06 Revised:2022-09-06 Online:2022-11-25 Published:2023-01-04

Abstract: Equipment configuration and development of the continuous annealing line was briefly introduced, and the development direction for annealed strip flatness optimization technology of cold-rolled ultra-high-strength steel was analyzed. For the problem of strip flatness, based on the analysis of the evolution mechanism of flatness during annealing process, the flatness optimization technology from the aspects of heating zone flatness optimization, cooling zone flatness optimization, skin-pass zone flatness optimization, annealing tension system optimization and furnace roll profile optimization was summarized. The effect of incoming strip flatness, annealing tension, annealing process, rapid heating and cooling technology, temperature uniformity along the width of the strip, furnace roll profile and skin-pass process on strip flatness of continuous annealing line was pointed out, which played an important guiding role in mastering the key process technology of strip flatness control in the continuous annealing process of ultra-high-strength steel and improving the core competitiveness of enterprises. Finally, the development trend of continuous annealing technology was also prospected.

Key words: ultra-high-strength steel, continuous annealing line, strip flatness, control technology, influencing factor

CLC Number: