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2012 Vol. 31 No. 6
Published: 2012-11-15
Continuous Casting Technology
Continuous Casting Equipment
Continuous Casting Technology
1
ZHANG Xiao-shuang1,LIU Xin-jian2,HONG Zu-jun1,CHEN Le1
Study and Application of CERI’S Mould Expert System(CMES)
The applications of slab caster CERI mould expert system (CMES) was introduced, which includes the breakout prediction system, mould thermal mapping system and other systems; A variety of strategies was used to predict the mould breakout, improve the prediction rate and decrease the false alarm rate.
2012 Vol. 31 (6): 1-4 [
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5
ZHU Shi-jiang
Alloy Steel Continuous Casting Billet Hot Delivery and Hot Charging Process Practice of High Efficiency
The problems for the implementation of alloy steel continuous casting billet hot delivery and hot charging process of high efficiency were researched. By means of the implementation of defect free alloy steel continuous casting billet production technology, high temperature alloy steel continuous casting billet production technology as well as the steelmaking and rolling integration production management technology, the high temperature alloy steel continuous casting billet hot delivery and hot charging logistics were ensured to be orderly, considerable economic benefits were created and the experiences were provided for the promotion.
2012 Vol. 31 (6): 5-7 [
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8
ZHAO Lei1,HE Yu-ming2,PAN Shi-song2,TIAN Lu1,PENG Gao1,XING Bao-long1
Study of Dynamic Secondary Cooling With Target Temperature Method
Based on the analysis of solidification heat transfer process, the solidification heat transfer model was evaluated for continuous casting products. Target surface temperature was determined by means of process conditions. The control model of secondary cooling water distribution was developed based on target surface temperature. Relationship of water and temperature field was obtained under different process conditions, such as steel, casting speed and so on. The slab surface target temperature and simulated temperature are ensured to be same through solidification model and the secondary cooling water control model; and the stability of the slab temperature field was also ensured by timely adjusting the amount of secondary cooling water.
2012 Vol. 31 (6): 8-12 [
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13
PENG Zheng,WEN Liang-ying,YANG Zhong-ping,CHEN Deng-fu
Effects of Thermal Boundary Conditions on Numerical Simulation of Molten Steel in Tundish
Based on the structure and operation parameters of a T-type tundish, a 3-D mathematical model has been developed to study the flow field and heat transfer of molten steel in the T-type tundish by the software FLUENT. Aiming at the problems existing in the thermal boundary condition for the numerical simulation of molten steel in the tundish, a mathematic model of tundish liner to study the heat transfer in the T-type tundish liner was introduced. The relationship between the heat flux and the temperature of inside-wall in the liner is used as the thermal boundary condition to simulate the flow field and heat transfer of molten steel in the T-type tundish by the software FLUENT. Simulation results show that the thermal boundary condition according to the mathematic model of tundish liner can obtain a result of flow field and heat transfer of the molten steel in the T-type tundish more conform to the reality than using the commonly thermal boundary conditions.
2012 Vol. 31 (6): 13-18 [
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Continuous Casting Equipment
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GUO Qing-hua1,YANG Jian-tao2,LIU Yu-bao1
Roll-Gap Deviations Analysis and Controlling in Soft Reduction Processing of Continuous Casting
The rolls gap shifting and rolls gap deviation phenomena were found in a slab continuous caster as the dynamic soft reduction system was put into the service. Spot testing and mechanism analyses were organized to find out the reason. It was found that the temperature change induced the rolls gap shifting and elastic deformation of segment, then the rolls gap deviation was caused, and corresponding measures were taken accordingly.
2012 Vol. 31 (6): 19-23 [
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PANG Zai-gang,LI Yong-lin
Analysis and Countermeasures of Secondary Cooling Nozzle Clogging
With the consideration of secondary cooling water treatment process and the features of secondary cooling facilities, the composition, morphology of spray nozzle clogging, secondary cooling water quality, the structure of spray nozzle and main steps during continuous casting are analyzed to find out the reasons of the secondary cooling spray nozzle clogging. The secondary cooling water quality and the maintenance quality of major equipment are the two key factors causing the clogging of spray nozzle. Owing to some corresponding measures, the number of clogged spray nozzles has decreased markedly.
2012 Vol. 31 (6): 24-26 [
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WANG Li-jun,DENG Ai-jun,DAI Yi
Design Development and Application of Anti-Distortion Device on Multi-Strand Tundish
By analyzing the mechanism of the down deflection causes on multi-strand tundish in the production of continuous casting, and by means of theoretical analysis, site survey and technical communication, a new kind of structure device was developed on the tundish. Then the problem of down deflection on tundish can be resolved;the requirement of multi-furnace continuous casting can be fulfilled; the use-cost of refractory of tundish can be greatly reduced; and the considerable economic value for the corporation has been created.
2012 Vol. 31 (6): 27-29 [
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LI Lei1,YU Ming-jie1,AN Hang-hang2,HAN Chuan-ji2
Production Practice of Near-Net-Shape Profiled Blank Caster in Laigang
The production practice of near-net-shape profiled blank caster in Laigang was introduced, such as technological process, ladle pouring, tundish pouring, no oxidation protective casting, mold design, design of protective slag, the second cooling and so on. Through the optimization of production process and technical improvement, the profiled blank caster casting technology continues to be mature, the production is stable and the slab quality has been further improved.
2012 Vol. 31 (6): 30-32 [
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Ctrand Quality
33
WANG Zhi-jun
Analysis and Countermeasures for Edge Crack Defect of L245 Hot-Rolled Coil
The reason of edge crack defect of L245 pipeline steel hot-rolled coil is analyzed and high temperature thermoplastic behavior of this steel grade is studied. The character of steel grade is the fundamental reason for the edge crack defect of hot-rolled coil, but the defect could be reduced via proper process system.
2012 Vol. 31 (6): 33-35 [
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LI Ji-dong,XU Qing-tai,SUN Zhong-qiang,XING Guo-cheng
Test and Analysis of Inclusions in SPHE Continuous Casting Slab
Inclusions in SPHE continuous casting slab were tested and analyzed by dendrite corrosion, cold acid etching, hot acid etching, OM(optical microscope), SEM(scanning electron microscope), EDS(energy dispersive spectrometer) and so on. The inclusions aggregation zone was found in 1/4 of inner arc in thickness of continuous casting slab, the composition of inclusions was main Al2O3, whose size was small. Some measures of reducing inclusions defect in continuous casting slab were proposed.
2012 Vol. 31 (6): 36-39 [
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WANG Chao,MU Jing-fei
Effect of Fag End Electromagnetic Stirring on Inside Quality in Con-Casting Billet of Bearing Steel
The effect of fag end electromagnetic (F-EMS) on center equiaxial crystal zone proportion, carbon, phosphorus, and sulphur segregation, porosity and sink of con-casting billet (180 mm×220 mm) in different technology parameters has been tested and analyzed. The results showed that the average center equiaxial crystal zone proportion in con-casting billet with F-EMS increasedfrom 42% to 69% in the billet without F-EMS when the F-EMS parameter was set on 12Hz/350A. The grade of center porosity, sink and center segregation was decreased to 1.0, 0 and 0 from 3.0, 1.5 and 1.5 without F-EMS, the extreme content of carbon, phosphorus and sulphur was decreased to 0.016%, 0.001% and 0.001% from 0.042%, 0.003% and 0.002% without F-EMS when the F-EMS parameter was set on 10 Hz/300A.
2012 Vol. 31 (6): 40-42 [
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TU Yu-guo1,ZHANG Guo-fu1,LIU En-yong1 JIANG De-yan1,XIE Zhen-dong1,HUANG Xiao-dong2
Quality Control of Caster on Billet Quality of Martensitic Anti-Heat Stainless Steel-1Cr6Si2Mo
During the process of caster production, a lot of quality flaws occurred on the billet of martensitic anti-heat stainless steel-1Cr6Si2Mo, such as center unsoundness, center void, segregation, rich columnar crystal and surface depression and so on. In view of these quality flaws, some measures were taken such as adjusting the overheat of liquid steel, choosing proper cooling speed, reducing the speed and upgrading M-EMS currency, so that the billet surface flaws can be increased efficiently and center porosity, void and segregation can be decreased.
2012 Vol. 31 (6): 43-46 [
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