scholarly journals Influence of Plasma Heating on the Metallurgical Effects of a Continuous Casting Tundish

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1438
Author(s):  
Maolin Ye ◽  
Mengjing Zhao ◽  
Sai Chen ◽  
Shufeng Yang ◽  
Jingshe Li
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Plasma Heating ◽  
Temperature Drop ◽  
Casting Process ◽  
Before And After ◽  
Continuous Casting Tundish ◽  
Product Homogeneity ◽  
Stable Degree ◽  
Unstable Product

Steel products have experienced long-standing problems such as unstable product quality and low product homogeneity. In the continuous casting process, realizing constant-temperature pouring is an effective way to improve product homogeneity. Plasma heating can compensate for the temperature drop during casting with a tundish and maintain a stable degree of superheating of the molten steel in the tundish. Plasma heating has a certain impact on the cleanliness of the molten steel and on the tundish covering flux in the tundish while compensating for the temperature drop. This paper uses SEM-EDS, XRD and FactSage to analyze the cleanliness of molten steel and the characteristics of the tundish covering flux before and after plasma heating. The results show that the number density of inclusions in the tundish is significantly lower after heating, improving the floating removal of small-sized inclusions; after heating, the surface morphology of the tundish covering flux sample appears transparent and glassy, with uniform morphology. XRD results show that the tundish covering flux after plasma heating exhibits no crystal precipitation and is amorphous and that there is a certain regularity before and after heating; there are no obvious changes in the composition of the tundish covering flux in the liquid phase area.

scholarly journals Influence of Plasma Heating on the Metallurgical Effects of a Continuous Casting Tundish

2020 ◽  
Author(s):  
Maolin Ye ◽  
Mengjing Zhao ◽  
Sai Chen ◽  
Shufeng Yang ◽  
Jingshe Li
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Removal Rate ◽  
Plasma Heating ◽  
Temperature Drop ◽  
Casting Process ◽  
Before And After ◽  
Continuous Casting Tundish ◽  
Product Homogeneity ◽  
Unstable Product

Steel products have experienced long-standing problems such as unstable product quality and low product homogeneity. In the continuous casting process, realizing constant temperature pouring is an effective way to improve product homogeneity. Plasma heating can compensate for the temperature drop during casting with a tundish and maintain a stable degree of superheating of the molten steel in the tundish. Plasma heating has a certain impact on the cleanliness of the molten steel and on the tundish covering flux in the tundish while compensating for the temperature drop. This paper uses SEM-EDS, XRD and FactSage to analyze the cleanliness of the molten steel and the characteristics of the tundish covering flux before and after heating. The results show that the number density of inclusions in the tundish is significantly lower after heating, improving the floating removal rate of small-sized inclusions; after heating, the surface morphology of the tundish covering flux sample appears transparent and glassy, with uniform morphology; XRD results show that the tundish covering flux after plasma heating exhibits no crystal precipitation and is amorphous and that there is a certain regularity before and after heating; there are no obvious changes in the composition of the tundish covering flux in the liquid phase area.

Characterization and Modeling of Ladle Teeming Process

2014 ◽  
Vol 1016 ◽  
pp. 65-69 ◽  
Author(s):  
Bruno A.B. Ribeiro ◽  
Leandro S. Oliveira ◽  
Roberto Parreiras Tavares
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Casting Process ◽  
Numerical Results ◽  
Continuous Casting Process ◽  
Ladle Slag ◽  
Funnel Formation

In the continuous casting process, significant amounts of molten steel are left in the ladle during teeming as an established practice to avoid vortexing funnel formation in the end of the teeming process, preventing the ladle slag to be carried over to the tundish. Thus, it was the objective of this work to experimentally and numerically analyze the funnel formation in ladle teeming process. Experiments were designed and carried out to verify the numerical results.

Research on Key Technologies of 38CrMoAl Steel Produced by BOF-LF-RH-CC Process

2011 ◽  
Vol 284-286 ◽  
pp. 1031-1038 ◽  
Author(s):  
Yong Chen ◽  
Jian Hua Zeng ◽  
Min Zhang ◽  
Hong Pan
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Casting Process ◽  
Al Content ◽  
Good Surface ◽  
High Aluminum Steel ◽  
Continuously Cast ◽  
And Performance ◽  
Si Content ◽  
The Stability

Nozzle blockage is easy to take place in continuous casting process when producing 38CrMoAl steel due to high content of aluminum ([Al]=0.7%~1.1%). Slag-steel reaction will lead to large transformation for composition of molten steel and performance of slag on the condition of traditional high content of SiO2 in slag. And it will reduce the cleanliness of steel as well. The control target of refining slag and tundish powder has been gotten through the analysis of refining & continuous casting characteristics of high aluminum steel. Based on this, the content of Si and Al in molten steel can be controlled accurately, and the cleanliness of steel has gone to a higher level. Moreover, mold powder with high basicity and vitrification ensures the stability of slag after sorbing Al2O3 inclusions in theory. Continuous casting can be carried out successfully with the control of inclusion morphology through slag washing during tapping. Industrial practice shows that Si content is 0.25%~0.40%, Al content is 0.80%~1.00%, S content is below 0.004% and T[O] is below 0.0015% in steel products. Moreover, casting bloom with good surface quality is achieved, and the rate of bloom without cleaning is as high as 100%. With all these countermeasures, 38CrMoAl steel can be continuously cast for more than 6 heats.

scholarly journals Removal of Inclusion from Molten Steel in Continuous Casting Tundish.

1992 ◽  
Vol 32 (1) ◽  
pp. 157-163 ◽  
Author(s):  
Nagayasu Bessho ◽  
Hisao Yamasaki ◽  
Tetsuya Fujii ◽  
Tsutomu Nozaki ◽  
Shouichi Hiwasa
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Continuous Casting Tundish

scholarly journals Melting and Flowing Behavior of Mold Flux in a Continuous Casting Billet Mold for Ultra-High Speed

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1165
Author(s):  
Jie Yang ◽  
Dengfu Chen ◽  
Fengting Qin ◽  
Mujun Long ◽  
Huamei Duan
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
High Speed ◽  
Mold Flux ◽  
Casting Process ◽  
Development Trend ◽  
Design And Optimization ◽  
Billet Continuous Casting ◽  
Ultra High Speed ◽  
Steel Flow

High casting speed coincides with the development trend of billet continuous casting, which significantly changes the casting characteristics. A mathematical model of the billet mold, which includes multiphase fluid flow, transient heat transfer, and solidification during ultra-high speed of the casting process was developed. The model is first applied to investigate the flow field of molten steel in the mold, studying the influence of steel flow upon the melting and flowing behavior of mold flux. The temperature and velocity distributions of the flux pool that formed above the molten steel surface are described. A parametric study on the melting temperature and viscosity of mold flux on liquid flux thickness and flow velocity is then carried out. Finally, the model is used to derive the relationship between interfacial tension and level fluctuations. The predictions provide an improved understanding of the melting and flowing behavior of mold flux in the billet mold and give the guidance for the design and optimization of mold flux for ultra-high speed of billet casting.

Interfacial Heat Flux Estimation in a Funnel Shaped Mould and Analysis of Solidification Characteristics in Thin Slab Continuous Casting

2021 ◽  
Author(s):  
Pedduri Jayakrishna ◽  
Ananda Vaka ◽  
Saurav Chakraborty ◽  
Suvankar Ganguly ◽  
Prabal Talukdar
Keyword(s):  
Heat Flux ◽  
Continuous Casting ◽  
Molten Steel ◽  
High Speed ◽  
Thermal Characteristics ◽  
Submerged Entry Nozzle ◽  
Casting Process ◽  
Transfer Model ◽  
Thin Slab ◽  
Slab Continuous Casting

Abstract An inverse heat transfer model based on Salp Swarm optimization algorithm is developed for prediction of heat flux at the hot faces of a mould in thin slab continuous casting. The industrial mould considered in this work is a funnel-shaped mould having complex arrangement of cooling slots and holes. Significant variations of heat flux along the casting direction, as well as across the width are observed. Subsequently, the obtained heat flux profile estimated by the inverse method is used to analyse the fluid flow and thermal characteristics of the solidifying steel strand inside the mould. Three different recirculatory zones are present due to molten steel flow, affecting the thermal and solidification characteristics significantly. The effect of these recirculatory flows on remelting phenomenon, and consequent formation of thinner shell at the mould outlet leading to quality control issues in the casting process have been discussed. Another practical issue of depression in the wide face shell thickness at the mould outlet has been identified, and its cause has been related to the location of the Submerged Entry Nozzle and the high speed of the molten steel inflow.

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