Cause analysis of black lines on HRB400E hot rolled ribbed bar

Cai Xiuli; Xu Huanqin; Hu Zhiwei; Wang Erhua; Zhao Yanlei

doi:10.7513/j.issn.1004-7638.2021.02.030

Volume 42 Issue 2

Apr. 2021

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Cai Xiuli, Xu Huanqin, Hu Zhiwei, Wang Erhua, Zhao Yanlei. Cause analysis of black lines on HRB400E hot rolled ribbed bar[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(2): 188-192. doi: 10.7513/j.issn.1004-7638.2021.02.030

Citation:

Cai Xiuli, Xu Huanqin, Hu Zhiwei, Wang Erhua, Zhao Yanlei. Cause analysis of black lines on HRB400E hot rolled ribbed bar[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(2): 188-192. doi: 10.7513/j.issn.1004-7638.2021.02.030

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Cause analysis of black lines on HRB400E hot rolled ribbed bar

doi: 10.7513/j.issn.1004-7638.2021.02.030

HBIS Company Limited Chengde Branch, Hebei Vanadium and Titanium Engineering Technology Research Center, Chengde 067102, Heibei, China

Received Date: 2020-12-07
Publish Date: 2021-04-10

Abstract

Abstract

In view of the phenomenon of black lines existing on the several batches of HRB400E hot-rolled ribbed bar with a diameter of 28 mm, the samples had been checked and analyzed by optical microscope, scanning electron microscope and energy dispersive spectrometer. The results show that the main reason for black line is the existence of compound type inclusions formed by mold flux or tundish covering agent involving continuous cast billet and the liquate of the submersed nozzles, which distribute in billet. As a result of stress effect, the cracks grow along the inclusions and propagate during the rolling. The black lines on the HRB400E hot-rolled ribbed bar can be effectively eliminated by optimizing the process parameters of continuous casting.
- hot-rolled ribbed bar,
- HRB400E,
- black lines,
- inclusions

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References(3)

References

[1]	Su Ruixian. Analysis on formation of slag entrapment defects in concasting and control measures[J]. Special Steel, 2011,32(1):27−29. (苏瑞先. 连铸夹渣类缺陷的成因分析和控制措施[J]. 特殊钢, 2011,32(1):27−29. doi: 10.3969/j.issn.1003-8620.2011.01.008
[2]	（丁俭. 薄板坯夹杂物分布和特点的研究[D]. 唐山: 河北理工学院, 2004.） Ding Jian. Studied the distribution and character of thin slab[D]. Tangshan: Heibei University of Science and Technolog, 2004.
[3]	Zhu Miaoyong, Wang Jun, Lei Hong, et al. Mechanism and control of slag entrapment of molten steel in mould during continuous casting[J]. Angang Technology, 2005,(2):1−4. (朱苗勇, 王军, 雷洪, 等. 连铸结晶器内钢水卷渣的机理与控制[J]. 鞍钢技术, 2005,(2):1−4. doi: 10.3969/j.issn.1006-4613.2005.02.001