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Mathematical Model of Decarburization of Ultra Low Carbon Steel during rh treatment

International Journal of Minerals,Metallurgy and Materials 1997年第4期11卷 19-23页

作者： ZHANG Lifeng JING Xuejing LI Jiying XU Thongbo CAI Kaike(Metallurgy Engineering School, USTB, Beijing 100083, China) USTB Beijing China

According to the balance of carbon and oxygen, a decarburization model for the rh treatment has been developed. in which the influence of the mass transfer of carbon and oxygen in the liquid steel and the stirring energy (ε) in the vacuum vessel on decarburization rate has been considered. The conclusion that the volumetric coefficients of the mass transfer of carbon is proportional to ε(1.5) is drawn. Industrical experiment proves this model is reliable. The influence of some factors on decarburization rate has been obtained. which can provide directions for rh treatment The decarburization behavior of steel with rh-OB treatment is also studied. The OB-or-not curve, the optimized OB time and OB amount are discussed.

关键词： rh treatment ultra-low carbon steel decarburization behavior mathematical model

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Periodic flow characteristics during rh vacuum circulation refining

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International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 17-21页

作者： Xin-gang Ai Yan-ping Bao Wei Jiang Jian-hua Liu Peng-huan Li Tai-quan Li Engineering Research Instute University of Science and Technology Beijing Beijing 100083 China Journals Publishing Center University of Science and Technology Beijing Beijing 100083 China

The circulation period of rh vacuum refining was studied to promote the refining efficiency. The influences of the lift gas flow rate and submersion depth of snorkels on the circulation period, and the relationship between mixing time and circulation flow were dis- cussed. The effects of the lift gas flow rate and submersion depth on the degassing rate in one circulation period were studied by water modeling. The results show that the circulation period is shortened by increasing the lift gas flow rate. The circulation period is the shortest when the submersion depth of snorkels is 560 mm. The whole ladle can be mixed thoroughly after three times of circulation. Increasing the lift gas flow rate can enhance the degassing rate of rh circulation.

关键词： rh treatment mixing water model flow characteristics

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Improved Removal Efficiency of Submicron Inclusions in Non-oriented Silicon Steel during rh Process

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Journal of Wuhan University of Technology(Materials Science) 2020年第6期35卷 1122-1127页

作者：陈天颖 JIN Yan CHENG Zhaoyang YUAN Zexi BI Yunjie 刘静 The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China

To improve the removal efficiency of such submicron inclusions,we designed an argon blowing method for an rh facility based on mathematical *** effect of the argon blowing on the liquid steel flow and the movement of submicron inclusions was studied using the k-ε flow model coupled with the DPM model for inclusion movement based on fluid computational dynamics in *** was found that a more uniform argon flow can be achieved in the up-leg snorkel with a new nozzle position and inner diameter,which resulted in a favorable up-lifting and mixing *** new design also increased the circulation rate of molten steel in the rh *** increased turbulent kinetic energy and turbulent dispersing rate enhanced the collision probability of submicron inclusions,which results in an improved removal for 0.5-1 μm *** proposed rh facility could increase the removal rate of submicron inclusions from the original 57.1% to 66.4%,which improves the magnetic properties of non-oriented silicon steel.

关键词： rh treatment argon blowing method model optimization submicron inclusions numerical simulation

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