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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1788-1798页

作者： Jie Li Yan-hui Sun Hang-hang An Pei-yuan Ni Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Metallurgy Northeastern UniversityShenyang 110819China Hesteel Group Technology Research Institute Shijiazhuang 050000China

In order to study the effect of continuous casting process parameters on the shape of slab solidification end under non-uniform cooling,a solidification model of a continuous-cast slab with non-uniform cooling condition was established with ProCAST *** model was verified by the results of nail shooting tests and the infrared temperature measurement *** characteristic parameters were defined to evaluate the uniformity of the shape of slab solidification *** results showed that the nonuniformity at the beginning and end of solidification,the solidification end length,and the solidification unevenness increased with the rise of casting *** each 10°C increase of superheat,the solidification unevenness increased by about ***,the effect of superheat on the solidification end length can be *** secondary cooling strength showed minimal effect on the nonuniformity at the beginning and end of *** the increase in secondary cooling intensity,the solidification end length decreased,but the solidification unevenness *** addition,the central segregation of the slab produced with and without the mechanical soft reduction(MSR)process was *** transverse flow of molten steel with low solid fraction influenced the central segregation morphology under MSR.

关键词： continuous casting heat transfer model nail shooting shape of solidification end central segregation

Heat Transfer and central segregation of Continuously Cast High Carbon Steel Billet

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Journal of Iron and Steel Research International 2014年第6期21卷 565-574页

作者： Wang SU Wei-ling WANG Sen LUO Dong-bin JIANG Miao-yong ZHU School of Materials and Metallurgy Northeastern University

A numerical model of heat transfer was developed to investigate the heat transfer of continuously cast billet with the aid of surface temperature tests by ThermaCAMTM researcher and nail shooting experiments. The effects of secondary cooling practice and casting speed on the solidification process and central segregation of carbon were investigated as well with the actual central segregation tests. The results show that the surface center and billet center temperatures exhibit a different pattern during solidification, and the solidified shell thickness is presented as an ＂S＂ type. With the increase of secondary cooling intensity and the decrease of casting speed, the end points of the solidus line and the liquidus line move forward, and the central segregation level of carbon decreases. The optimal casting condition is suggested for continuously cast high carbon billet with F-EMS （final electromagnetic stirring）.

关键词： continuously cast billeti high carbon steel heat transfer central segregation

Comparison and integration of final electromagnetic stirring and thermal soft reduction on continuous casting billet

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Journal of Iron and Steel Research International 2021年第2期28卷 160-167页

作者： Yan-shen Han Wei Yan Jiang-shan Zhang Jun Chen Wei-qing Chen Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Xiangtan Iron&Steel Co. Ltd.of Hunan ValinXiangtan 411101HunanChina

Final electromagnetic stirring(F-EMS)and thermal soft reduction(TSR)are techniques that improve the inner quality of continuous casting billets,but they have rarely been applied *** application effects of F-EMS and TSR were compared,and a process integrating F-EMS and TSR was adopted for a billet continuous caster.A heat transfer model was established to calculate the thermal behavior of 82A tire cord steel *** locations of F-EMS and TSR were determined,followed by conducting a series of plant trials,involving F-EMS alone,TSR alone,and the integrated process of F-EMS and *** results showed that F-EMS or TSR could effectively improve the inner quality of the billet under their respective suitable working ***,F-EMS was found to be more helpful in terms of improving central segregation,while TSR tended to improve V-segregation,central porosity,and *** integration of F-EMS and TSR allowed the advantages of each technique to be utilized,thereby better improving the inner *** all the working conditions,82A steel billet showed optimum inner quality when the current of F-EMS was 240 A and the cooling intensity of TSR was 2.2 m^(3) h^(−1).These findings demonstrate that the integration of F-EMS and TSR is promising for application on continuous casting billets.

关键词： Billet continuous casting Final electromagnetic stirring Thermal soft reduction central segregation Inner quality

Control Model of Bloom Dynamic Soft Reduction

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Journal of Iron and Steel Research International 2010年第9期17卷 31-35页

作者： CHEN Yong JI Cheng ZHU Miao-yong WU Guo-rong Department of Material Research Panzhihua Iron and Steel Research Institute Panzhihua 617000 Sichuan China School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

There are significant effects of process parameters on internal qualities of bloom, and these process parameters are as follows. position and reduction amount, reduction distribution, reduction rate, and so on. Developing a control model is the key to apply soft reduction technology successfully. As the research object, 360 mm ×450 mm bloom caster in PISCO （Panzhihua Iron and Steel Co. ） has been studied, and the research method for control model of dynamic soft reduction has been proposed. On the basis of solidification and heat transfer model, the position of soft reduction and reduction distribution of each frame are determined according to the bloom temperature distribution and solid fraction in bloom center calculated. Production practice shows that the ratio of center porosity which is less than or equal to 1.0, increased to 97.27%, ratio of central segregation which is less than or equal to 0.5, increased to 80.91%, and ratio of central carbon segregation index which is more than or equal to 1.10, decreased to 4% with the applying model of dynamic soft reduction.

关键词： bloom continuous casting dynamic soft reduction control model center porosity central segregation

Solute redistribution and macrosegregation in continuous casting slab of carbon steel during solidification process

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Baosteel Technical Research 2020年第4期14卷 33-39页

作者： WEN Hongquan WU Cunyou ZHOU Yueming Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

Based on the modified Scheil model of solute redistribution,the effects of solidification rate,molten steel flow,and alloy composition on solute macrosegregation during the solidification of carbon steel continuous casting billet are calculated and analyzed. The formation mechanism of "white band "segregation under the condition of electromagnetic stirring is also involved,and some practical countermeasures to restrain the central segregation are suggested. The results show that the modified Scheil model can be applied to predict and analyze the macrosegregation of casting slab effectively. The ratio vx/R of the flow velocity of molten steel to solidification rate has decisive formations of segregation such as linear,V,and "white band"types. It is an effective way to select sufficient terminal cooling and reasonable electromagnetic stirring in order to decrease macrosegregation in the slab. The concept of the characteristic distance of solute enrichment layer can drastically simplify the calculation of solute redistribution at the solid/liquid interface of various elements in carbon steel.

关键词： central segregation solute redistribution Scheil model continuous casting

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利用数据挖掘预报连铸板坯中心偏析

利用数据挖掘预报连铸板坯中心偏析