Edge cracking causes of hot rolled strips produced by CSP

ZHAO Changliang; SUN Yanhui; TIAN Zhihong; CAI Kaike; LIU Jianhua; CHENG Xiaojun; WU Guangliang; ZHOU Chunquan

doi:10.13374/j.issn1001-053x.2007.05.013

Volume 29 Issue 5

Aug. 2021

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ZHAO Changliang, SUN Yanhui, TIAN Zhihong, CAI Kaike, LIU Jianhua, CHENG Xiaojun, WU Guangliang, ZHOU Chunquan. Edge cracking causes of hot rolled strips produced by CSP[J]. Chinese Journal of Engineering, 2007, 29(5): 499-503. doi: 10.13374/j.issn1001-053x.2007.05.013

Citation:

ZHAO Changliang, SUN Yanhui, TIAN Zhihong, CAI Kaike, LIU Jianhua, CHENG Xiaojun, WU Guangliang, ZHOU Chunquan. Edge cracking causes of hot rolled strips produced by CSP[J]. Chinese Journal of Engineering, 2007, 29(5): 499-503. doi: 10.13374/j.issn1001-053x.2007.05.013

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Edge cracking causes of hot rolled strips produced by CSP

doi: 10.13374/j.issn1001-053x.2007.05.013

1. Metallurgical and Ecological Engineering School, University of Science and Technology, Beijing 10083, China;
2. Lianyuan Steel, Loudi 417000, China

Received Date: 2006-02-05
Rev Recd Date: 2006-08-28

Available Online: 2021-08-16

Abstract

Abstract

The edge cracking causes of hot rolled strips produced by CSP were investigated by optical microscope (OM), scanning electron microscope (SEM), transmittion electron microscope (TEM) and energy-dispersive X-ray analysis (EDX). The results indicated that deep oscillations of thin slabs were the origin of the edge cracks of hot rolled strips and AIN precipitates around the prior austenite grain boundaries due to intensive cooling rate rendered the slabs more susceptible to cracks. After seven rolling stands, the transverse cracks of the slabs would propagate to serrated edge cracks, even drop-out type cracks of hot rolled strips.
- CSP,
- hot rolled strip,
- edge cracks,
- cause