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Size analysis of slag eye formed by gas blowing in Ladle refining

Journal of Iron and Steel Research(International) 2017年第3期24卷 243-250页

作者： Ning-ning Lv Liu-shun Wu Hai-chuan Wang Yuan-chi Dong Chang Su School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243032 Anhui China Key Laboratory of Metallurgical Emission Reduction & Resources Recycling Ministry of Education Ma' anshan 243002 AnhuiChina

The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was employed to simulate slag. The simulation results revealed that the gas flow rate and bath height had strong effects on the slag eye size. In particular,the thickness of slag layer played a strong role in the slag eye size. In addition,the slag eye could not be formed when the thickness of the top layer was more than 4 cm in water-silicone oil model.Besides,the section area of vessel had a great impact on the slag eye size. Industrial trials results showed a similar trend that the gas flow rate was very significant on the slag eye size. The predictions of the existing models showed larger predictions deviations compared with the experimental data. Moreover,a new model without fitting parameters was developed based on force balance and mathematical derivation,and verified by the experimental data. The new model provides the prediction with small deviations by comparing with the data acquired from cold models and industrial trials.

关键词： Slag eye Cold model Industrial trial Gas blowing Ladle refining

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LATS refining ladle slag modifying with CaO-CaF_2

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Journal of University of Science and Technology Beijing 2007年第2期14卷 125-129页

作者： Hongming Wang Guirong Li Zhongming Ren Bo Li Xuejun Zhang Guomin Shi School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China Shanghai Enhanced Laboratory of Ferro-Metallurgy Shanghai University Shanghai 200072 China Stainless Steel Branch Baosteel Group Shanghai 200431 China

To reduce the slag sticking onto the snorkel of the ladle during the ladle alloying treatment station （LATS） process, CaO- CaF2 （the mass ratio of CaO/CaF2 is 1：1） was employed as the modifier of the LATS refining ladle slag. The effect of CaO-CaF2 on the melting point, viscosity, and desulfurizing capability of the ladle slag was investigated. The melting point of the unmodified ladle slag is 1439℃. When adding 20wt% CaO-CaF2, the melting point is decreased to 1327℃. At 1500℃. the viscosity of the unmodified ladle slag is 6.5 Pa.s, which can be decreased lower than 2 Pa.s by adding more than 10wt% CaO-CaF2. The experimental results of desulfu- rization of the melts show that the desulfurizing power of the ladle slag can be enhanced by adding CaO-CaF2.

关键词： LATS Ladle refining slag melting point viscosity desulfurization

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Study on Oxygen Content, Inclusions and Fatigue Properties of Bearing Steels Produced by Different Processes

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Journal of University of Science and Technology Beijing 2001年第1期8卷 25-27页

作者： Deguang Zhou Jie Fu Xichun Chen Jing Li Metallurgy School, University of Science and Technology-Beijing, Beijing 100083, China Metallurgy School Univ. of Science/Technology-Biejing Beijing 100083 China

The metallurgical properties and fatigue life of bearing steel processed by electric furnace (EAF), Ladle refining (LF-VD), continous casting (CC) and electroslag remelting (ESR) have been investigated. The main results obtained are as follows: (1) Due to low oxygen content and dispersion inclusions in steel, the fatigue Life of LF-VD-IC or CC is three times as high as that of EAF steel; (2) The oxygen content in steel produced by CC process is about 9.0x10(-6), the carbon segregation (C/C(0)) is from 0.92 to 1.10 and the fatigue life of CC steel is equal to that of Ladle refining ingot casting steel; (3) Although the amount of inclusion and oxygen in ESR steel is higher than that of LF-VD-IC or CC steel, the fatigue life of ESR steel is higher than that of the latter because of its fine and well dispersed inclusions.

关键词： bearing steel Ladle refining continuous casting electroslag remelting oxygen content inclusion fatigue life

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