Study on the utilization of supersaturation degree in Al deoxidation to improve cleanliness and control of Al2O3 inclusions in ultra-low carbon steel

IF 1.1 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI:10.1051/METAL/2021007

Yun-qing Ji, M. Jiang, Xiaoxuan Deng, Chunyang Liu, F. Huang, Xinhua Wang

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引用次数: 1

Abstract

Effects of supersaturation degree (S) in Al deoxidation on cleanliness and alumina inclusions in steel were studied. If enough Al was added to steel, higher initial dissolve oxygen before Al deoxidation resulted in higher steel cleanliness. In the experiments, with the rise of [mass% O] from 102 ppm to 340 ppm and 931 ppm, logS in steel melts were increased from 4.8, to 7.0 and 8.8, respectively. As a result, total oxygen (T.O) was decreased to 25 ppm, 22 ppm and 21 ppm, respectively. Based on the results, important influence of supersaturation degree on the formation of Al2O3 was revealed. At lower S, Al2O3 would be singular and smaller particles ≤ 5 µm that was difficult to be removed. However, Al2O3 would exist as large clusters in steel at higher S, which can be efficiently removed. By utilizing the findings in laboratory, RH refining of ultra-low-carbon steel was optimized. Steel cleanness and control of inclusions were improved. As a result, surface defects in cold rolling sheets caused by Al2O3 inclusions were effectively minimized.

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利用过饱和度在Al脱氧中提高超低碳钢的清洁度和控制Al2O3夹杂物的研究

研究了铝脱氧过程中过饱和度(S)对钢的清洁度和氧化铝夹杂物的影响。如果钢中加入足够的Al，则在Al脱氧前的初始溶解氧较高，从而导致钢的清洁度较高。在试验中，当[质量% O]从102 ppm增加到340 ppm和931 ppm时，钢熔体的log分别从4.8、7.0和8.8增加。结果，总氧(T.O)分别降至25ppm、22ppm和21ppm。结果表明，过饱和程度对Al2O3的形成有重要影响。在较低的S下，Al2O3呈奇异状，颗粒较小，≤5µm，难以去除。然而，在高S下，Al2O3在钢中会以大团簇的形式存在，可以有效地去除。利用实验室研究结果，对超低碳钢的RH精炼工艺进行了优化。提高了钢材的清洁度和夹杂物的控制。从而有效地减少了Al2O3夹杂物引起的冷轧薄板表面缺陷。

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来源期刊

Metallurgical Research & Technology METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.70

自引率

9.10%

发文量

审稿时长

4.4 months

期刊介绍： Metallurgical Research and Technology (MRT) is a peer-reviewed bi-monthly journal publishing original high-quality research papers in areas ranging from process metallurgy to metal product properties and applications of ferrous and non-ferrous metals and alloys, including light-metals. It covers also the materials involved in the metal processing as ores, refractories and slags. The journal is listed in the citation index Web of Science and has an Impact Factor. It is highly concerned by the technological innovation as a support of the metallurgical industry at a time when it has to tackle severe challenges like energy, raw materials, sustainability, environment... Strengthening and enhancing the dialogue between science and industry is at the heart of the scope of MRT. This is why it welcomes manuscripts focusing on industrial practice, as well as basic metallurgical knowledge or review articles.