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Viscous properties of new mould flux based on aluminate system with CeO_2 for continuous casting of RE alloyed heat resistant steel

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Journal of rare earths 2016年第3期34卷 328-335页

作者：亓捷刘承军李春龙姜茂发 Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) Northeastern University Baotou Iron and steel (Group) Co. Ltd.

The conventional mould fluxes can not be applied to the continuous casting of RE alloyed heat resistant steel, because severe slag-metal interface reactions occur generally in the mold. To restrain the interface reaction and improve conditions for continuous casting, a new mould flux based on aluminate system was devised. The viscous properties were investigated. Scanning electron microscopy and X-ray diffraction were applied to detect and characterize the crystalline phases in the continuous cooling process. The results showed that appropriate addition of CeOcould avoid the precipitation of CaO and decrease the viscosity of the mould flux. Increasing the mass ratio of CaO /AlO, especially to a value exceeding 1, could worsen the stability of the mould flux. With a content of less than 14 wt.%, LiO could reduce the viscosity and breaking temperature, but its effect could be weakened for the promoted precipitation of LiAlO. To obtain a mould flux with stable viscous properties, such as viscosity and breaking temperature, appropriate contents of CeOand LiO should be controlled to around 10 wt.% and 14 wt.%, while the mass ratio of CaO /AlOshould not be more than 1.

关键词： mould flux aluminate melt viscosity rare earth steel heat resistant steel

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维普期刊数据库

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A Coupled Thermodynamic Model for Prediction of Inclusions Precipitation during Solidification of Heat-resistant steel Containing Cerium

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Journal of Iron and steel Research International 2015年第6期22卷 457-463页

作者： Yan-dong LI Cheng-jun LIU Chun-long LI Mao-fa JIANG Key Laboratory for Ecological Metallurgy of Multimetallic Minerals(Ministry of Education) Northeastern University Baotou Iron and steel(Group)Company

A coupled thermodynamic model of inclusions precipitation both in liquid and solid phase and microseg- regation of solute elements during solidification of heat-resistant steel containing cerium was established. Then the model was validated by the SEM analysis of the industrial products. The type and amount of inclusions in solidifica- tion structure of 253MA heat-resistant steel were predicted by the model, and the valuable results for the inclusions controlling in 253MA steel were obtained. When the cerium addition increases, the types of inclusions transform from SiO2 and MnS to Ce2 O3 and Ce2O2 S in 253MA steel and the precipitation temperature of SiO2 and MnS decrea- ses. The inclusions CeS and CeN convert to Ce2 O3 and Ce2 O2 S as the oxygen content increases and Ce2 O3 and CeN convert to Ce2 O2 S, Ce3 S4, and MnS as the sulfur content increases. The formation temperature of SiO2 increases when the oxygen content increases and the MnS precipitation temperature increases when the sulfur content increa ses. There is only a small quantity of inclusions containing cerium in 253MA steel with high cleanliness, i. e. , low oxygen and sulfur contents. By contrast, a mass of SiO2 , MnS and Ce2 O2 S are formed in steel when the oxygen and sulfur contents are high enough. The condition that MnS precipitates in 253MA steel is 1.2wEo[O] ＋W[s]〉0. 01% and SiO2 precipitates when 2w[O] ＋wrs[S]〉0. 017% （W[S]0. 005%） and w[O]〉0. 006% （w[S]〉0. 005%）.

关键词： heat-resistant steel rare earth steel inclusion microsegregationl solidification thermodynamic model

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Internal Friction and Profile of Property and Structure of PD_3 and PD_3RE Rail steels

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Journal of rare earths 2006年第5期24卷 640-640页

作者： Li Huili Yu Ning Sun Zhenyan Ji Jingwen Chen Jianjun Ren Xinjian College of Sciences Northeastern University Shenyang 110004 Research Institute of Iron and steel Baotou Iron and Steel Co. Baotou 014010 China

The profile of both hardness and microstructure of continuous casting blanks and rails of PD3 heavy rail steel and PD3RE steel containing small amount of rare earth （RE） added from tundish were studied. It is found that the addition of RE makes the fluctuation of the hardness value decrease, and inhibits effectively and/or even removes lower hardness value（zone） in the centric area of the blank with a cross section of 280 mm × 380 mm, and that the surface layer in the rail head of PD3RE steel is obviously hardened and the reason causing this hardening is due to the thinning of the pearlite structure. The metallographic observation shows that there exists a Fe-P（C） eutectic structure in the blank center of the PD3 steel containing only 0. 016% P, while the addition of RE can fully inhibit this structure.

关键词： rare earth steel profile of microstructure and property internal friction

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