Influence of Electropulsing Treatment on the Initial Solidification of Molten Steel During Continuous Casting

2019 ◽  
Vol 50 (4) ◽  
pp. 1608-1616 ◽  
Author(s):  
Guomin Ying ◽  
Wanlin Wang ◽  
Haihui Zhang ◽  
Jie Zeng
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Electropulsing Treatment ◽  
Initial Solidification

Hook evolution and inclusion entrapment during initial solidification process of continuous casting slab

2018 ◽  
Vol 116 (1) ◽  
pp. 103
Author(s):  
Xiao Pengcheng ◽  
Wu Xiaoyan ◽  
Zhu Liguang ◽  
Liu Zengxun
Keyword(s):  
Continuous Casting ◽  
Molten Steel ◽  
Swirling Flow ◽  
Solidification Process ◽  
Shell Shape ◽  
Slab Melting ◽  
Continuous Casting Slab ◽  
Hook Depth ◽  
Formation And Evolution ◽  
Initial Solidification

A two-dimensional numerical model was established to describe the mechanism of hook formation and evolution during the initial solidification process of continuous casting slab. Melting, coarsening, growing, and burying stages were observed to follow hook formation at the meniscus. The coordinates at which the hook was finally buried into the shell were determined for different casting speeds and pouring temperatures. The final hook depth was predicted to be approximately 1.8–2.9 mm, which was confirmed by metallographic experiments. A physical model was established based on the calculated shell shape, and the process by which the inclusions were entrapped by the hook structure was investigated. The results indicated that the floating inclusions were most likely entrapped under the nascent hook, and the inclusions gathering near the meniscus were easily captured by the upper part of the nascent hook when overflow of the molten steel occurred. The hook-like structure increased the area of the shell inner face, which resulted in swirling flow of the molten steel near the shell and increased the probability of the inclusions being captured.

scholarly journals Influence of M-EMS on Fluid Flow and Initial Solidification in Slab Continuous Casting

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3681
Author(s):  
Guoliang Liu ◽  
Haibiao Lu ◽  
Bin Li ◽  
Chenxi Ji ◽  
Jiangshan Zhang ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Flow Field ◽  
Continuous Casting ◽  
Casting Speed ◽  
Liquid Pool ◽  
Industrial Test ◽  
Magnetic Flux Density ◽  
Continuous Casting Mold ◽  
Slab Continuous Casting ◽  
Initial Solidification

A mathematical model coupled with electromagnetic field has been developed to simulate the transient turbulence flow and initial solidification in a slab continuous casting mold under different electromagnetic stirring (EMS) currents and casting speeds. Through comparing the magnetic flux density, flow field with measured results, the reliability of the mathematical model is proved. The uniform index of solidified shell thickness has been introduced to judge the uniformity of the solidified shell. The results show that a horizonal recirculation flow has been generated when EMS is applied, and either accelerated or decelerated regions of flow field are formed in the liquid pool. Large EMS current and low casting speed may cause the plug flow near the mold narrow face and a suitable EMS current can benefit to the uniform growth of solidified shell. Meanwhile, an industrial test exhibits that EMS can weaken the level fluctuation and number density of inclusion. Overall, a rational EMS current range is gained, when the casting speed is 1.2 m/min, the rational EMS current is 500–600 A.

The Effect of Temperature Fluctuation on the Formation of Billet Surface Defect in the Initial Solidification Area

2010 ◽  
Vol 148-149 ◽  
pp. 163-167
Author(s):  
Xiao Li Jin ◽  
Zuo Sheng Lei ◽  
Kang Deng ◽  
Zhong Ming Ren
Keyword(s):  
Continuous Casting ◽  
Temperature Fluctuation ◽  
Surface Defects ◽  
Casting Process ◽  
Effect Of Temperature ◽  
Billet Surface ◽  
Maximum Value ◽  
Key Factor ◽  
Oscillation Marks ◽  
Initial Solidification

The heat transfer in steel continuous casting process under mold oscillation was calculated, and temperature fluctuation phenomena was found in the initial solidification area, the maximum value was approximate 16 °C. The effect of different continuous casting parameters on temperature fluctuation were analyzed, and the temperature fluctuation was considered to be a key factor to the formation of oscillation marks. The Index of Temperature Fluctuation(ITF) was proposed to predict the effect of temperature fluctuation on the formation of billet surface defects.

Effects of U-Shape Inner Cooler on Flow and Solidification of Molten Steel in Slab Continuous Casting Mold

2011 ◽  
Vol 291-294 ◽  
pp. 423-427
Author(s):  
Yan Juan Jin ◽  
Xiao Chao Cui ◽  
Zhu Zhang
Keyword(s):  
Fluid Dynamics ◽  
Temperature Field ◽  
Flow Field ◽  
Continuous Casting ◽  
Molten Steel ◽  
Continuous Casting Mold ◽  
Slab Continuous Casting ◽  
Cooling Technology ◽  
Steel Flow

An inner-outer coupled cooling technology of molten steel for 1240×200mm slab continuous casting, that is to set an inner cooler—U shape pipes in the mold, is put forward in order to enhance the efficiency of transmitting heat and improve inner structure of billet. The flow status and solidification status of molten steel under coupling flow field and temperature field in inner-outer coupled cooling mold are simulated by using fluid dynamics software, and compare with those in traditional mold. It is found that setting inner cooler in the mold can make molten steel flow status even, which is favorable to floating up of the inclusion, quickening the solidification of steel liquid and improving the quality of billet.

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