Cause analysis on cold drawing fracture of ER70S-6 steel coil and process optimization measures

doi:10.13251/j.issn.0254-6051.2023.08.044

Heat Treatment of Metals ›› 2023, Vol. 48 ›› Issue (8): 272-275.DOI: 10.13251/j.issn.0254-6051.2023.08.044

• FAILURE ANALYSIS • Previous Articles Next Articles

Cause analysis on cold drawing fracture of ER70S-6 steel coil and process optimization measures

Fan Zhenxia^1,2,3, Zhang Yuming^1,2,3, Dong Qing^1,2,3, Zhao Haoqian^1,2,3, Li Yashuo ^1,2,3, Wei Qiaoling^1,2

1. Hebei Xinggang Technology Co., Ltd., Xingtai Hebei 054799, China;
2. Xingtai Iron and Steel Co., Ltd., Xingtai Hebei 054027, China;
3. Hebei Wire Engineering Technology Innovation Center, Xingtai Hebei 054027, China

Received:2023-03-06 Revised:2023-06-28 Online:2023-08-25 Published:2023-10-10

Abstract

Abstract: ER70S-6 steel ø6.5 mm hot-rolled coil fractured during cold drawing, and the batch of coils was tested by means of chemical composition, mechanical properties, and microstructure inspection. The results show that the martensite in the core and bainite at the edge of the coil are the causes of drawing fracture. The production of martensite in the core and bainite at the edge can be effectively reduced by reducing the entering temperature of finishing rolling from 960 ℃ to 920 ℃ and increasing the length of insulation cover by 5 m.

Key words: ER70S-6 steel coil, cold drawing fracture, martensite, bainite

CLC Number:

TG356.63

Fan Zhenxia, Zhang Yuming, Dong Qing, Zhao Haoqian, Li Yashuo , Wei Qiaoling. Cause analysis on cold drawing fracture of ER70S-6 steel coil and process optimization measures[J]. Heat Treatment of Metals, 2023, 48(8): 272-275.

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Cause analysis on cold drawing fracture of ER70S-6 steel coil and process optimization measures

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