Improvement the Round Bloom Continuous Casting Technology at JSC “Ural Steel”

2021 ◽  
Vol 410 ◽  
pp. 275-280
Author(s):  
Lilya A. Ayvazyan ◽  
Nadezhda K. Nikoli ◽  
Aleksey N. Shapovalov
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Thermal Conditions ◽  
Cooling Zone ◽  
Secondary Cooling ◽  
Cooling Mode ◽  
Bloom Formation ◽  
Thermal Calculations

The results of assessment of macrostructure and surface quality of round blooms 455 mm in diameter, cast on 4-strand continuous casting machine (CCM) at JSC “Ural Steel” are presented. The analysis of technological casting parameters of round blooms 455 mm in diameter (from steel grade “2”) at bloom caster of JSC “Ural Steel” are completed. Violations in casting temperature and rate parameters, which deteriorate thermal conditions of solidification and quality of continuous casting blooms, have been revealed. The main causes of unsatisfactory bloom quality have been determined, which are the increased overheating of cast metal and irrational secondary cooling mode. The results of the experiment to evaluate the surface temperature dynamics of a round bloom in the secondary cooling zone are presented, which confirmed the inefficiency of the secondary cooling mode for the defect-free bloom formation. As a result of thermal calculations of round blooms solidification of 455 mm in diameter, rational coolant flow rates by secondary cooling sections for bloom caster of JSC “Ural Steel” have been proposed. Optimized secondary cooling parameters provide a softer secondary cooling of the round bloom, which reduces the probability of the surface and internal defects development.

scholarly journals Computational experiment on determination of load on the rollers of continuous casting machine

2020 ◽  
Vol 178 ◽  
pp. 01032
Author(s):  
Navak Bashirov ◽  
Daniya Zaripova ◽  
Irina Bashirova
Keyword(s):  
Continuous Casting ◽  
Computational Experiment ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Cooling Water ◽  
Cooling Zone ◽  
Secondary Cooling ◽  
Secondary Cooling Zone ◽  
Required Quality

The article is devoted to calculations of load on rollers of a curvilinear continuous casting machine during bending of the ingot in the levelling section. The calculation takes into account the elastic and plastic characteristics of metal and the flexibility of the roller apparatus. Determination of load on rollers together with meeting other requirements such as reducing the cooling water consumption, minimizing the energy consumption enables optimizing the technology of slab cooling in the secondary cooling zone (SCZ) and obtaining metal of the required quality.

scholarly journals MATHEMATICAL MODELING OF THE PROCESSES OF THE FORMATION OF CAST UNITS IN THE CONTINUOUS CASTING OF STEEL

2019 ◽  
Author(s):  
А.С. Нурадинов ◽  
Н.С. Уздиева ◽  
Э.М. Балатханова ◽  
А.Н. Тепсаев
Keyword(s):  
Mathematical Modeling ◽  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Variable Parameter ◽  
Casting Machine ◽  
Cooling Zone ◽  
Continuous Casting Of Steel ◽  
Secondary Cooling ◽  
Secondary Cooling Zone ◽  
Proposed Model

Проведен теоретический анализ процессов формирования литых заготовок при непрерывной разливке стали. На базе проведенного анализа разработана математическая модель для изучения термосиловых процессов, происходящих в кристаллизаторе и зоне вторичного охлаждения машины непрерывного литья заготовок (МНЛЗ). Методом математического моделирования определены параметры теплообмена и затвердевания исследуемых заготовок вдоль ее технологической оси. В качестве переменного параметра при формировании заготовок рассмотрена интенсивность теплоотвода в зоне вторичного охлаждения. Установлено, что математическое моделирование достаточно адекватно воспроизводит процессы формирования реальной непрерывнолитой заготовки, что позволяет рекомендовать предложенную модель для проведения исследований и оптимизации условий теплообмена в зоне вторичного охлаждения МНЛЗ. A theoretical analysis of the formation of castings in the continuous casting of steel. Based on the analysis, a mathematical model has been developed for the study of thermoforce processes occurring in the mold and the secondary cooling zone of a continuous casting machine (CCM). The parameters of heat transfer and solidification of the studied blanks along its technological axis are determined by the method of mathematical modeling. The intensity of the heat sink in the secondary cooling zone is considered as a variable parameter in the formation of blanks. It is established that mathematical modeling adequately reproduces the processes of formation of a real continuouscast billet, which allows us to recommend the proposed model for research and optimization of heat exchange conditions in the zone of secondary cooling of continuous casting machines.

Designing of a Novel Shroud for Improving the Quality of Steel in Tundish

2012 ◽  
Vol 585 ◽  
pp. 359-363 ◽  
Author(s):  
Debasish Chatterjee
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Steel Production ◽  
Metal Bath ◽  
Ladle Slag ◽  
Exchange Operation ◽  
Slag Entrainment ◽  
Steel Flow

In present 92.8% of world steel production is casted on continuous casting machine. The key phase of continuous casting is tundish. Beside of refining effect of slag phase also steel flow in tundish is very important factor. The main causes for inclusion formation and contamination of the melt include reoxidation of the melt by air and carried over oxidizing ladle slag, entrainment of tundish and ladle slag, and emulsification of these slags into the melt. These causes are due to generation of turbulence in the melt. Although turbo stop lowers the turbulence in some extent. But it is not capable of totally decrease of turbulence specially during lowering of metal bath at the time of ladle exchange operation, cause contamination of the steel melt in tundish. So in the present work it has been focused to develop a novel shroud which have significant role to supply of steel from ladle to tundish at slow rate to avoid turbulence, emulsification and formation of slag eye in tundish to produce quality steel in a sustained manner.

scholarly journals Influence of Cooling Conditions on a Slab’s Chill Zone Formation During Continuous Casting of Steel

2017 ◽  
Vol 62 (2) ◽  
pp. 911-918 ◽  
Author(s):  
P. Drożdż
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Continuous Casting Of Steel ◽  
Secondary Cooling ◽  
Zone Formation ◽  
Casting And Solidification ◽  
Cooling Conditions ◽  
Chill Zone ◽  
The Impact

AbstractThe cooling conditions of a slab during continuous casting of steel have an impact on the crystalline structure formation. Numerical methods allow real processes to be modelled. Professional computer programs are available on the market, so the results of their simulations allow us to understand the processes that occur during the casting and solidification of the slab. The study attempts to evaluate the impact of the intensity of the secondary cooling on the chilled zone size. The calculations show the differences in the structure of a slab cast with various speeds while maintaining industrial cooling parameters during operation of a continuous casting machine.

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