热轧卷板表面夹渣缺陷来源分析及控制现状

doi:10.13228/j.boyuan.issn0449-749x.20210312

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Abstract The slag entrainment defects on the surface of hot-rolled coils have an extremely bad effect on the quality and product performance of hot-rolled coils, resulting in the degradation of product grades and even scrapping, and deteriorate the service deadline and performance of the products to a certain extent. With the continuous improvement of the cleanliness of the molten steel in the smelting process, the quality problems caused by slag entrainment defects appear to be particularly serious. The sources of surface slag entrainment defects under different production processes are slightly different. The main sources of defects are ladle slag entrapment during refining, ladle roughing slag during unsteady pouring, tundish covering agent involvement during steady pouring, mold slag entrapment, and so on. The control and optimization of slag entrainment defects on the surface of hot-rolled coils are of great significance to improve its surface quality. The sources of slag entrainment defects were summarized and analyzed, including the ladle refining slag, tundish covering agent, mold flux, refractory lining, and so on. The effect of the fluid flow of the molten steel inside the mold, mold flux properties, and meniscus behavior on the mechanism of the slag entrainment were summarized and analyzed. The methods to control slag entrainment defects on the surface of hot-rolled coils at home and abroad were summarized and analyzed. Some guiding suggestions were putting forward, adding electromagnetic coils around the submerged entry nozzle to reduce the vortex through the direct action of the DC magnetic field, adding a baffle at the tundish shroud to improve the eccentricity of the ladle outlet, changing the nozzle parameters to reduce the shear force induced by the upper recirculation steel fluid flow, changing properties of the mold flux or adding the electromagnetic force to balance the surface tension of the slag-steel interface, and optimizing casting parameters such as the argon flow rate.

Key words： hot-rolled coil surface slag entrainment defect source of slag entrapment continues casting control

Received: 21 May 2021

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	REN Ying
	LI Xin-zhe
	YUAN Tian-xiang
	CHEN Wei
	ZHOU Hai-chen
	ZHANG Li-feng

Cite this article:

REN Ying,LI Xin-zhe,YUAN Tian-xiang等. Source analysis and control status of slag defects on surface of hot-rolled coil[J]. Iron and Steel, 2022, 57(1): 13-27.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210312 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I1/13

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