Control of edge breaks during cold mill processing of commercial and drawing quality low-carbon steels. (9th August 2019)

• Record Type: Journal Article
• Authors: Zhou, Tihe; Zurob, Hatem; Zhang, Peng; Kuuskman, Kate; Cho, Sang Hyun; Burella, Dan
• Is Part Of: Ironmaking & steelmaking. Volume 46:Number 7(2019)
• Page Start: 656
• Page End: 662
• Publication Date: 2019-08-09
• Subjects: Edge breaks -- yield-point elongation -- heterogeneous grain microstructure; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2018.1440780
• Languages: English
• ISSNs: 0301-9233

Abstract

ABSTRACT: The effects of chemistry, reduction ratio and annealing cycle on edge breaks/Lüder lines during cold mill processing of commercial and drawing quality low-carbon steels have been investigated. It is possible to eliminate Lüder bands and associated yield-point elongation (YPE) by producing interstitial free steels that do not contain any free C or N. In low-carbon steel, however, it is necessary to develop other strategies for reducing Lüdering and YPE. Reduction ratios and annealing cycles that resulted in a uniform, completely recrystallised microstructure were ineffective at reducing YPE. It was determined that the most promising approach for reducing YPE in steels containing free interstitials is to develop a heterogeneous microstructure. This was achieved through abnormal grain-growth in the full-recrystallised material to create a bimodal grain-size distribution. The implications for the production of commercial and drawing quality low-carbon steels are discussed.