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Simulation of meniscus fluctuations in the feeding system used in strip casting

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Baosteel Technical Research 2017年第3期11卷 1-6页

作者： REN Sanbing fan junfei Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

The feeding system used in the strip casting process delivers molten metal from the tundish to the pool that is bordered by side dams and rolls and is one of the key units in the production of high quality strip metal. The traditional method for studying this key unit is to use a combination of a water model and a mathematical model. However,the relations in the model with and without roll rotation have not been clearly revealed in previous studies. A 2D transient model based on a continuity equation, momentum equation, turbulent equations, and a VOF equation was established in this study and used to simulate the meniscus fluctuation. A half model with a structured grid was used for the reported simulation. The simulation showed that significant differences existed in the fluctuation in the flow fields and wave length with or without the roll rotation. The wave fluctuation exhibited uncertainty and an unstable character in the roll rotation condition. The level fluctuation employing different process parameters such as rotating speed and immersion depth of tip angle was simulated and compared with and without roll rotation. The study results showed that the meniscus fluctuation of twin-roll strip casting was primarily affected by the roll rotation, and the level fluctuation increased with the increase in rotation velocity and decreased with immersion depth.

关键词： strip casting mathematical simulation meniscus level fluctuation

Experimental and mathematical modeling of metal spray forming process

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Baosteel Technical Research 2011年第3期5卷 9-14页

作者： ZHANG Yin fan junfei REN Sanbin Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources Inner Mongolia University ofScience and Technology Baotou 014010 Inner Mongolia China School of Rare Earth Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China Advanced Technology Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

The metal spray forming process was examined using mathematical simulation and verified through the prototyping evaluation at Baosteel＇ s test and development facilities. The mathematical model comprised of four sections, including jet gas flow in the deposition chamber;single droplet behavior along its trajectory path;probability and statistical analysis of droplet mass behavior, and forecast of the shape and temperature distribution of the billet during the spray forming process.

关键词： spray forming droplets simulation statistical method billet

Study of influence of ladle condition on molten steel during strip casting

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Baosteel Technical Research 2019年第2期13卷 3-9页

作者： REN Sanbing fan junfei fanG Yuan Research Institute Baoshan Iron &Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and Rolling Shanghai 201999China

A model of the heat transfer between molten steel and the ladle lining was established for the strip casting process,which involves a series of different operations. These operations include preheating,ladle tapping,ladle waiting,blowing of argon gas,and ladle pouring. To simulate the process of pouring molten steel,the geometric deformation( moving grid) technique was used in the model. Moreover,the model considers the heat absorption effect of argon gas and the formation of open eyes during argon blowing. Note that the model was used to compare the effect of different parameter values,including different preheating temperatures,tapping temperature,and argon blowing rates. The results indicate that the argon blowing rate has considerable influence on the decrease in the temperature of molten steel.

关键词： strip casting ladle mathematical simulation temperature field

Numerical simulation of tube profile growth during spray forming process

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Baosteel Technical Research 2011年第3期5卷 15-19页

作者： REN Sanbing fan junfei LE Hairong Advanced Technology Division Research Institute Baoshan Iron ＆Steel Co. Ltd. Shanghai 201900 China

Spray forming is a new type of metal material forming process,which can produce metal blanks such as billet, tube,plate etc. A mathematical model has been developed to forecast the shape evolution of tube billets during the spray forming process. The atomizer mass flux as ,radial distribution coefficient bs, draw velocity and diameter of mandrel were considered in this model and the influence of different parameters such as metal flowrate, draw velocity of mandrel, diameter of mandrel on the tube＇ s shape change were simulated and analyzed in this paper. The simulation results obtained from this model can be provided to engineers as reference.

关键词： spray forming mandrel tube billet simulation

The development of China's special steel and the application prospects of spray-formed materials

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Baosteel Technical Research 2011年第3期5卷 3-8页

作者： fan junfei ZHAO Shunli REN Sanbing MA Chao Advanced Technology Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

Suggestions have been put forward speeding up the development of high-level tool steel and mold steel in China based on the analysis of products and development status of special steel home and abroad. Feasibility and necessity to produce high-level tool steel and mold steel by applying the spray forming method in future have been put forward.

关键词： special steel high speed steel die steel powder metallurgy (PM)

Microstructure and forming characteristics of spray-formed M42 high speed steel

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Baosteel Technical Research 2011年第3期5卷 33-37页

作者： ZHAO Shunli fan junfei MA Chao ZHOU Candong Advanced Technology Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China School of Materials-Science and Engineering Shanghai Jiaotong University Shanghai 200030 China

M42 high speed steel （HSS）, a high grade alloy, was produced using the spray forming technology. Optical metallography （OM）,X-ray diffraction （XRD） and scanning electron microscope （SEM） were used to investigate the microstructures of the as-sprayed M42 HSS and the as-atomized powders. It is found that as-sprayed M42 HSS is composed of martensite, retained austenite and carbides. The grain size, as well as the morphology, size and distribution of the carbides have been greatly improved compared with those of the as-cast M42 steel （ a traditional process）. The size of the powder obtained at a high cold speed was ranged from 50 μm to 100μm in diameter. Its representative microstructures include dendrite, dendritic fragments, a mixture of dendrites, equiaxed grains and dendritic fragments,and equiaxed grains. The rapid solidification in the spray forming is a key factor to cause the refinement of the M42 HSS.

关键词： spray forming high speed steel microstructure

Microstructure of the spray formed Vanadis4 cold work die steel and its evolution during hot rolling and heat treatment

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Baosteel Technical Research 2011年第3期5卷 20-27页

作者： SHI Haisheng YAN Fei fan junfei LE Hairong JIN Bingzhong Advanced Technology Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Cold-rolling Plant Wuhan Iron and Steel Co. Ltd. Wuhan 430083 China

A high alloyed Vanadis4 （V4） steel was produced by spray forming process in Baosteel, and the microstructure of the as-sprayed steel and its evolution during hot rolling and annealing processes were characterized. It was found that the as-sprayed V4 steel has a homogeneous and fine scale rrficrostructure with uniform dispersion of carbides. The hot rolling temperature is the key factor in controlling the evolution of type, morphology and distribution of carbides, as well as the matrix microstructure of the as-rolled steels. The optimized processing parameters for the as-sprayed V4 steel are rolling at 1050℃ and then annealing at 900℃. The microstructural evolution mechanisms during hot rolling and annealing are determined according to the microstructural analyasis of the material at different stages.

关键词： spray forming Vanadis4 steel microstructure evolution

The numerical simulation of the movements and thermal states of atomized metal droplets in the spray forming process

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Baosteel Technical Research 2009年第2期3卷 58-63页

作者： YUAN Feng fan junfei REN Sanbing LE Hairong ZHAO Shunli Advanced Technology Division Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

Numerical simulation was performed in an atomizing chamber to investigate the movements and thermal states of the atomized metal droplets in the spray forming process. The velocity, temperature and solid fractions of metal droplets with different diameters and under different atomizing pressures were investigated. The results indicate that a higher atomizing pressure results in the increased flying velocity of the metal droplets and a decrease in the cone-shaped angle formed by their flight paths. Synchronously, the cooling of the metal droplets is accelerated and the time of the complete solidification process is shortened. Under the same atomization pressure, large metal droplets have a lower flying speed and a lower rate of temperature decrease in the atomizing chamber than small metal droplets. In addition, metal droplets flying along the edge of the atomizing region cool faster than those flying in the core region.

关键词： spray forming atomization pressure atomized metal droplet diameter numerical simulation

Development and application of model for predicting molten metal temperature in continuous casting process

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Baosteel Technical Research 2019年第2期13卷 10-16页

作者： fan junfei REN Sanbing fanG Yuan ZHOU Jiangang QIN Bo Research Institute Baoshan Iron &Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and Rolling Shanghai 201999China

An unsteady mathematical thermal model was developed for predicting the time,molten-steel weight,induction heating power,and temperature changes of the steel from the end of ladle refining to the end of the continuous-casting process of a tundish. The calculations revealed that for a specific strip-casting process,the ladle tonnage should be controlled to about 90 t. If the ladle capacity reaches 130 t,the provision of a 1 500-kW tundish induction heating device is recommended. By comparing the measured and predicted molten-steel temperature values in the Ningbosteel-Baosteel strip casting industrialization demo project( NBS) of a tundish,it was determined that the prediction accuracy of the model could meet the forecasting accuracy requirements for the molten-steel temperature in the tundish during mass production. Simultaneously,the heat flux density on each surface of the tundish was found at about 50 min,which is entirely consistent with the values reported in the related literature,and the tundish had not reached a heat balance during the casting test period. This model can also be applied to calculate the suitable size of a tundish for a specific continuous-casting process,thereby providing a theoretical basis for the design of the continuous-casting tundish.

关键词： continuous casting strip casting molten metal temperature prediction model