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攀钢2#板坯连铸结晶器漏钢预报系统 总被引:1,自引:3,他引:1
介绍了攀钢新建 2 # 板坯连铸机漏钢预报控制系统 ,对系统的组成、功能及实现作了简要阐述。将DANIELI公司开发的结晶器漏钢检测系统MBDS专业软件 ,成功应用于攀钢 2 # 连铸机 ,不但减少了漏钢事故的发生和铸坯废品量 ,而且改善了铸坯质量 ,增强了连铸生产效能 ,为攀钢三期工程建设顺利达产提供了保障 相似文献
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连铸结晶器内粘结漏钢的形成机理及对策 总被引:1,自引:0,他引:1
连铸结晶器内钢液弯月面在连铸生产中起着至关重要的作用,本文结合钢液弯月面的行为对粘结漏钢的形成进行了详细地分析,介绍了一种新的粘结漏钢形成机理,认为钢液弯月面的破损是粘结漏钢发生的直接起因,此外,还在该机理的基础上,探讨了防止粘结漏钢的对策。 相似文献
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连续铸钢过程中结晶器的传热研究 总被引:1,自引:0,他引:1
为了研究结晶器内壁温度的分布,设计了模拟结晶器工作过程的实验装置,并进行了实验。实验结果表明,结晶器内壁温度趋近于冷却水温度。基于实验,推导了结晶器边界等效导热系数。该系数用于解决金属和冷却水之间的传热,即反映结晶器的传热能力。用等效导热系数处理结晶器的边界传热,对包括结晶器在内的连铸凝固进程温度场进行数值模拟既简单又方便,并且计算结果与实验结果符合。还讨论了拉坯速度和冷却水流量对结晶器温度场的影响。 相似文献
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Flow of Steel in Mold Region During Continuous Casting 总被引:1,自引:0,他引:1
The particle image velocimetry (PIV) technique was used to study the fluid flow phenomena that occurred during continuous casting, using a water model with dimensions of 1 840 mm×280 mm. Two types of solidified shells, ie, the smooth type and the coarse type, were used to characterize the dendrite in order to simulate different liquid solid interfacial conditions. The influence of the nozzle angle and the immersion depth of nozzle, as well as the casting speed on the flow behavior was investigated quantitatively. The results were as follows: (1) There are two large recirculations above and below the fluid jet in the mold, respectively, under the smooth interface condition. However, in the case of the dendrite solidified shell, it was found that the flow velocity of the fluid decreased and more smaller vortices appeared in the upper region of the mold. (2) The angle and the immersion depth of nozzle are two important factors affecting the flow pattern, and they are also capable of bringing about the change in the flow direction. (3) The higher the casting speed, the higher are the jet stream and the impacting point on the narrow face. However, the high casting speed causes serious fluctuation of the meniscus, and correspondingly leads to various defects. 相似文献
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Klaus Schwerdtfeger 《国际钢铁研究》2006,77(12):911-920
Two principal methods are used to investigate the heat transfer in the continuous casting mold. The direct way is to measure cooling water temperatures, mold wall temperatures, strand temperatures and shell thickness in actual operation, and then deduce from these data the correlations for heat flux densities. The other way is to investigate the “unit operations” of heat transfer theoretically or experimentally in the laboratory, viz. heat transfer through a layer of casting flux or of gas, and heat transfer in a copper wall cooled on one side by water. The results obtained in this approach can then be used to explain the data determined with the direct method and to optimize the heat transfer behaviour of the mold in the machine. In the first part of this paper some unit operations are discussed and engineering formulae are given for computation of the heat resistances of the gap and the copper/water system. In the second part of the paper the available operational data on heat flux density are analysed. Algorithms are presented for computation of local and average heat flux density as functions of casting speed, carbon content of the steel and composition of the casting flux. Finally, values of shell thickness are computed with the correlation for heat flux density and are compared with the measured data. 相似文献
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Hashimoto Yoshinari Matsui Akitoshi Hayase Toshiyuki Kano Manabu 《Metallurgical and Materials Transactions B》2020,51(2):581-588
Metallurgical and Materials Transactions B - To realize precise flow control of molten steel in the continuous casting mold, we developed a real-time flow estimation algorithm based on a... 相似文献
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A kinetic calculation model considering both a molten slag reaction with molten steel and an Al2O3 inclusion absorption in molten slag was developed to estimate the change in Al2O3 in molten slag during the continuous casting of high aluminum steel. Practical casting experiments of high aluminum steel
were conducted to investigate the change in composition in the molten slag and to validate the proposed model. The calculated
results show that the Al2O3 concentration in the molten slag increases quickly during the initial stage and gradually approaches a steady-state value
after 900 seconds of casting, which agrees well with the experiment outcome. The change in Al2O3 in molten slag is mainly affected by the initial Al2O3 concentration w
0 of the mold powder, reaction equilibrium concentration of Al2O3
w* at the slag-steel interface, mass transfer coefficient
\textk\textF,\textAl2 \textO3 {\text{k}}_{{{\text{F}},{\text{Al}}_{2} {\text{O}}_{3} }} in molten slag, Al2O3 inclusion concentration w
M
, and absorption coefficient β in molten steel during continuous casting of high aluminum steel. The experiment result shows
that the concentration of Al2O3 in molten slag increases significantly and that SiO2 decreases strongly, while the other components in the molten slag can be negligible comparatively. Mold slag properties at
0, 5, and 45 minutes change greatly, which can deteriorate the performance of the mold slag. 相似文献
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Sung Suk Jung Gi Hyun Kim Il Sohn 《Transactions of the Indian Institute of Metals》2013,66(5-6):577-585
The effect of Al2O3 on the crystallization and viscosity of calcium-silicate based fluxes with Na2O and Li2O additions used for continuous casting mold fluxes have been studied using the confocal laser scanning microscope and the rotating spindle rheometer. Al2O3 additions lowered the crystallization temperature of the flux and several crystalline phases for fluxes with high concentrations of SiO2 forms depending on the cooling rate. High Al2O3 containing fluxes formed relatively few crystalline phases and were not highly dependent on the cooling rate. At slow cooling rates of 25 K/min for 10 and 20 wt% Al2O3 containing samples, SEM images revealed dendrites formed within the crystalline phases. At faster cooling rates the dendrite formation is inhibited and a spherical morphology could be observed. The substitution of SiO2 with Al2O3 content modified the dominant silicate network into complex alumino-silicates. This increased the viscosity of the melt. FTIR and Raman analysis showed increased amounts of symmetric Al–O0 stretching with higher Al2O3. With higher CaO/(SiO2 + Al2O3), the symmetric Al–O0 stretching and the Si–O–Al seems to decrease. 相似文献
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