scholarly journals Evaluation of Solidification Times for Medium and High Carbon Steels Based upon Heat Transfer and Solidification Phenomena in the Continuous Casting of Blooms

10.5772/60706 ◽  
2015 ◽  
Author(s):  
Panagiotis Sismanis
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Carbon Steels ◽  
High Carbon ◽  
Heat Transfer And Solidification

Heat Transfer and Solidification Model of Slab Continuous Casting Based on Nail-Shooting Experiments

2015 ◽  
Vol 1088 ◽  
pp. 153-158 ◽  
Author(s):  
An Gui Hou ◽  
Yi Min ◽  
Cheng Jun Liu ◽  
Mao Fa Jiang
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Liquid Core ◽  
Casting Process ◽  
Soft Reduction ◽  
Slab Continuous Casting ◽  
Solidification Model ◽  
Core Length ◽  
Measurement Results ◽  
Heat Transfer And Solidification

A heat transfer and solidification model of slab continuous casting process was developed, and the nail-shooting experiments were carried out to verify and improve the prediction accuracy. The comparison between the simulation and the measurements results showed that, there exists difference between the model predicted liquid core length and the calculated liquid core length according to the measurement results of the solidification shell thickness. In the present study, the value of constant a in the heat transfer coefficient calculation formula was corrected through back-calculation, results showed that, the suitable value of a is 31.650, 33.468 and 35.126 when the casting speed is 0.8m·min-1, 0.9m·min-1 and 1.0m·min-1 respectively, which can meet the liquid core length of the measurement results. The developed model built a foundation for the application of dynamic secondary cooling, and dynamic soft reduction.

The Mould Flux Heat Conduction Performance Designing of High Carbon Steel for Thin Slab Continuous Casting

2014 ◽  
Vol 1033-1034 ◽  
pp. 1313-1316
Author(s):  
Hui Rong Li ◽  
Li Gen Sun ◽  
Li Qun Ai
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Carbon Steel ◽  
Continuous Casting ◽  
Orthogonal Experiment ◽  
High Carbon Steel ◽  
Thin Slab ◽  
High Carbon ◽  
Slab Continuous Casting ◽  
Mould Flux

Heat transfer of the mould flux between the mould and the strand is very complicated, especially for the high carbon steel thin slab continuous casting. In this research the orthogonal experiment has been carried out, and the results showed that: the effect for the heat flux form strong to weak is: R>Na2O>F>MgO>BaO. and in the experiment range, with the R increasing, when the R, Na2O content and the F- content are increasing, the heat flux would be decreasing; with the MgO content increasing, the crystallization temperature would getting fluctuant; with the BaO content increasing, the heat flux would getting fluctuant, when its content is around 6%, the heat flux is reach its summit.

3D steady state and transient simulation tools for heat transfer and solidification in continuous casting

2005 ◽  
Vol 413-414 ◽  
pp. 135-138 ◽  
Author(s):  
Seppo Louhenkilpi ◽  
Mika Mäkinen ◽  
Sami Vapalahti ◽  
Tuomo Räisänen ◽  
Jukka Laine
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Continuous Casting ◽  
Transient Simulation ◽  
Simulation Tools ◽  
Heat Transfer And Solidification

Steel Structure Prediction for Continuous Steel Casting by Means of a Parallel GPU-Based Heat Transfer and Solidification Model

2015 ◽  
Author(s):  
Lubomír Klimeš ◽  
Josef Štětina ◽  
Tomáš Mauder
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Structure Prediction ◽  
Steel Production ◽  
Steel Structure ◽  
Production Method ◽  
Micro Structure ◽  
Solidification Model ◽  
Minimum Number ◽  
Heat Transfer And Solidification

Continuous casting of steel is currently a predominant production method of steel, which is used for more than 95% of the total world steel production. An effort of steelmakers is to cast high-quality steel with a desired structure and with a minimum number of defects, which reduce the productivity. The paper presents our developed GPU-based heat transfer and solidification model for continuous casting, which is coupled with a submodel used for the prediction of the steel micro-structure. The model is implemented in CUDA/C++, which allows for rapid computing on NVIDIA GPUs. The time-dependent temperature distribution calculated by the thermal model is iteratively passed to the submodel for the steel micro-structure prediction. The structural submodel determines the spatially-dependent rates of temperature change in the strand, for which the interdendritic solidification model IDS predicts the micro-structure of steel. The paper presents preliminary simulation results for the steel grade used for pressure vessel plates, which is sensitive to rapid cooling rates.

Deformation and Structure Difference of Steel Droplets during Initial Solidification

2017 ◽  
Vol 36 (4) ◽  
pp. 347-357 ◽  
Author(s):  
Yang Li ◽  
Jing Wang ◽  
Jiaquan Zhang ◽  
Changgui Cheng ◽  
Zhi Zeng
Keyword(s):  
Carbon Steel ◽  
Continuous Casting ◽  
High Carbon Steel ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Solidification Structure ◽  
Low Carbon ◽  
High Carbon ◽  
Peritectic Steel ◽  
Initial Solidification

AbstractThe surface quality of slabs is closely related with the initial solidification at very first seconds of molten steel near meniscus in mold during continuous casting. The solidification, structure, and free deformation for given steels have been investigated in droplet experiments by aid of Laser Scanning Confocal Microscope. It is observed that the appearances of solidified shells for high carbon steels and some hyper-peritectic steels with high carbon content show lamellar, while that for other steels show spherical. Convex is formed along the chilling direction for most steels, besides some occasions that concave is formed for high carbon steel at times. The deformation degree decreases gradually in order of hypo-peritectic steel, ultra-low carbon steel, hyper-peritectic steel, low carbon steel, and high carbon steel, which is consistent with the solidification shrinkage in macroscope during continuous casting. Additionally, the microstructure of solidified shell of hypo-peritectic steel is bainite, while that of hyper-peritectic steel is martensite.

The Effect of Fluid Flow on Heat Transfer and Shell Growth in Continuous Casting of Copper

2006 ◽  
Vol 508 ◽  
pp. 503-508 ◽  
Author(s):  
Sami Vapalahti ◽  
Seppo Louhenkilpi ◽  
Tuomo Räisänen
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Continuous Casting ◽  
Turbulent Fluid Flow ◽  
Turbulent Fluid ◽  
Material Data ◽  
University Of Technology ◽  
Flow Heat ◽  
Heat Transfer And Solidification ◽  
Transfer Models

Molten metal is cooled in a continuous casting mould forming initially a thin shell that grows thicker. The main phenomena in the mould are: fluid flow, heat transfer and solidification. A lot of mathematical models have been developed to simulate these phenomenons in continuous casting machines but most of the models developed are not calculating the fluid flow at all. In these models, it is assumed that the strand (solid and liquid) is withdrawn through the machine with a constant velocity field (= casting speed) and the convective heat transfer generated by the fluid flow is taken into account by using an effective thermal conductivity method. Also at the Helsinki University of Technology, these kinds of heat transfer models have been developed (TEMPSIMU for steels and CTEMP3D for coppers). The flow in the mould is three-dimensional and turbulent. Coupled models calculate the fluid flow, heat transfer and solidification simultaneously. The fluid flow is affected by many things: inlet flow rate, design of the inlet nozzle (SEN), immersion depth of the SEN, movement of the solid shell, natural convection, solidification shrinkage, etc. and the fully coupled, turbulent fluid flow and heat transfer models are generally subjected to convergence difficulties and they need a lot of computing time. Due to these reasons, these kinds of models are not so much used in industry so far. In the present study, a commercial FLOW-3D package is used to make coupled simulations of heat transfer, turbulent fluid flow and solidification in a copper continuous casting machine. The effect of thermophysical material data are also studied and presented. The material data are calculated by a model developed at the Helsinki University of Technology, called CASBOA.

METHODS FOR MODELING HEAT TRANSFER AND SOLIDIFICATION IN CONTINUOUS CASTING

2018 ◽  
Author(s):  
Matthew T. Moore ◽  
Bangju Chen ◽  
Ken Morales ◽  
Armin Silaen ◽  
Chenn Q. Zhou
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Heat Transfer And Solidification
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