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2013 Vol. 32 No. 3
Published: 2013-05-15
Continuous Casting Technology
Strand Quality
Continuous Casting Equipment
Continuous Casting Technology
1
WANG Bao-sheng,CHEN Yu-xin,WANG Hao
Practice of Steel-Grade Change After Flying Tundish in Shougang Jingtang Continuous Caster
Flying tundish is an effective way for cutting down preparing time in continuous casting, consequence in more operating time, higher production or lower cost. There are always same steel grades before and after flying tundish. However, the paper introduces technologies to change steel grade after flying tundish, which was proved being practically available in Shougang Jingtang.
2013 Vol. 32 (3): 1-3 [
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4
WEN Peng,XU Shu-qiang
Cause Analysis and Preventive Measures of Breakout in Slab Continuous Caster
Conglutinating breakout is a common style on breakout accidents in Slab continuous casting. Analyses on the cause of breakout in slab continuous caster at Chongqing Steel-Making Plant from 2010.12 to 2012.3 was carried out. It was believed that poor performance of covering slag, fluctuation of liquid level, frequent change of pulling rate,submersed nozzle bias flow are the main reasons for sticking breakout. Improvements and preventive measures were proposed and good results were obtained.
2013 Vol. 32 (3): 4-7 [
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7
SHEN Wen-jun,WANG Bao-feng,LI Jian-chao
Optimization of Mould Taper Design for Continuous Casting of Wide and Thick Slab
The taper of wide and thick slab mould of a domestic steel mill was optimized based on the actual production situation. A finite element method (FEM) was employed for the calculation of temperature field and law of slab shrinkage in the mold. The influences of casting speed and liquid steel superheating on temperature field and law of slab shrinkage were analyzed. Based on the results obtained the mould taper was optimized: using larger taper at 120~300mm near liquid surface and using minor taper at mould bottom 300~900mm from liquid surface. The result is very similar with that in reality, showing that the result is right.
2013 Vol. 32 (3): 7-11 [
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1589
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12
TONG Li-jun
Exploration of New Method for Continuous Casting
The current limitations of the continuous casting mold oscillation mode of production and its problems are introduced, and the types of casting defect and causes are analyzed. Newly developed principles and advantages of non-vibrating mould are proposed, and the method to use a non-vibrating mould for production of high quality round slabs, round billets in mold and hollow tubes is presented.
2013 Vol. 32 (3): 12-14 [
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1483
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15
TIAN Jian-liang,CHEN Kai-yi,JIANG Zhong-kuai
Development and Practice of Meishan Breakout Prediction System
In the production process of No.2 slab caster of Meishan Steel-Making Plant, the breakout accidents often occur more frequently, and at the same time the number of false alarm positives, seriously affects the slab quality and production efficiency of the caster.In view of this situation, Meishan Steel self-developed breakout prediction system for No.2 slab caster,and then put it into use. After that the sticking breakout was completely avoided, the problem was solved and the substantial costs were saved for the company.
2013 Vol. 32 (3): 15-17 [
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1470
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18
SONG Long-fei,DENG An-yuan,XU Ling,YIN Xiao-qiang
Numerical Simulation of Molten Steel Stream Flow Field With Bias Flow in Billet Mold
In the experiment, a model was created based on the mold of a stainless steel billet continuous caster of 165mm×163mm. The distribution of flow field and liquid level fluctuation in the billet mold with a nozzle deviated from the center of the mold inlet with different distance were investigated. The CFX software was used to simulate the process. The results show that the impact of molten steel stream on the billet shell of outer arc is weakened when the nozzle deviates from the centre of the mold inlet by 12mm. At the same time, the backflow of molten steel on the wall of the mold can flow to the meniscus and the distribution of flow field in the mold is more reasonable.
2013 Vol. 32 (3): 18-20 [
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1487
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21
WANG Jing-liang,XU Gui,HOU Ya-xiong
Research and Amelioration of ABB EMS
Hunan Valin Xiangtan Iron and Steel Group Co., Ltd. imported a big bloom and abnormity EMS stirrer system from ABB, but some disfigurements were found during production, including tie-in leakage, insulation fall, short life time etc. Aimed at solving those disfigurements, an improvement of research and design was performed. In this paper, ABB stirrer’s configuration, characteristic and disfigurements were introduced, and magnetic field distribution was briefly described. In order to ensure magnetic intensity, an ANSYS emulator software was used to simulate theoretic magnetic field，and it is confirmed that the magnetic intensity can meet technical requirement.
2013 Vol. 32 (3): 21-25 [
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Continuous Casting Equipment
26
ZI Fu-ning,LU Chao-yang
Application of Electric Cylinder on-Line Thermal Wide-Altering on Slab Caster
The existing technology products status of on-line thermal wide-altering device was analyzed; and electric cylinder on-line thermal wide-altering technology on slab continuous casting mould was developed independently and has been used on slab continuous casting mould in a steel factory. System composition, working principle, technical index, main advantages, motion rule, control mode and achieved results of this new technology have been introduced.
2013 Vol. 32 (3): 26-30 [
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31
LI Hui-jie,LIU Hong-yi
Design and Application of Process Detection and Automatic Control for Extra-Section Round Bloom Casting
In recent years, improved requirement for large-section billet promotes technology development and product upgrades of iron and steel industry. In this investigation the reliable technology application of instrumentation and automatic control were applied for extra-section round bloom casters. These applications contain steel weighting, tundish continuous temperature measuring, slag detection, mould level detection and control, mould cooling water detection and control, secondary cooling water detection and control, dynamical secondary cooling model, automatic control system configuration and so on. The properties and characteristics are expressed for different devices. Practice of technology application above mentioned is proved effective on enhancing quality, improving productivity, and ensuring safety.
2013 Vol. 32 (3): 31-34 [
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35
LI Song-shan,DUAN Xue-liang,FAN Xing-chen,LI Xue-rong,SUN Bo
Technical Study and Application of Split Roller Cooling Water Sealing of Caster in Shouqin
Leaking between the three split rollers of caster segment for the non-entire shaft roller has a serious influence on the surface quality of the slab and the costs of segment maintenance. In this study, the characteristics and reasons of leakage points section of the roller were analyzed, and the key point was obtained which is that how to ensure the synchronization of three split rollers and nonrigid connection between rollers. According to the analysis, the slider with a cross shaft coupling was confirmed. Practice proved that the scheme can perfect the solution of the three split rollers leaking problem, and greatly prolong the roller life, and improve the surface quality of slab.
2013 Vol. 32 (3): 35-39 [
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Strand Quality
40
SHEN Yong-dai,SONG Wei,XU Ke
Study on Control Technology of Slab Quality for Low-Alloy Steel
There were serious transverse corner cracks on continuous casting slab of low alloy steel in Panzhihua Steel before, and study on the control of slab quality had been carried out. Some effective countermeasures are put forward, such as the optimization of primary cooling system and mold powder. Industrial tests show that the transverse corner cracks on continuous casting slab have been significantly reduced, and the reject rate of hot rolled sheet caused by the transverse corner cracks is reduced from 7.2% to 0.74%.
2013 Vol. 32 (3): 40-45 [
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