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Van Oudenallen R.G.,Danieli Corus BV | Verbraak P.,Danieli Corus BV | Geerdes H.A.M.,Geerdes and Partners BV | Klaassen M.G.O.,Corus Research Development and Technology
Ironmaking and Steelmaking | Year: 2011

The asymmetry in the distribution of blast flow in hot blast systems modeled using a three-dimensional computational fluid dynamics (CFD) mode was investigated. A three-dimensional CFD model was made of the hot mains of a hot blast system. The inlets of the tuyere stocks were modeled and the rest of the tuyere stock was represented by a resistance. The deviation between the lowest flow and maximum flow at the tuyeres is ~10%. The models showed that with increasing diameter of the bustle main, the maximum deviation between the normal flows to the tuyeres reduces. The major part of the asymmetry was caused by the split of hot blast at the connection of the hot blast main to the torus shaped bustle main. It was recommended that the geometry influence could be reduced by increasing the ratio between the resistance of the tuyere stock and the resistance of the bustle main. A CFD model could be made of the hot blast system with commissioning conditions. Source


Zhu W.,University of Manchester | Yin W.,University of Manchester | Peyton A.,University of Manchester | Ploegaert H.,Corus Research Development and Technology
2010 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2010 - Proceedings | Year: 2010

This paper presents the modelling of an H-shaped ferrite core electromagnetic sensor for phase transformation detection in steel rolling application. It has been found that the response of the H-shaped sensor after normalisation can be described by a simple analytical model. Further, it has been found that the zero-crossing frequency for the real part of the inductance spectra and the peak frequency of the imaginary part of the inductance spectra for both air-cored and ferrite-cored sensors are linearly proportional to the magnetic permeability of the steel strip under test These findings are helpful in understanding the response of the EM sensor and possibly lead to more accurate determination of steel magnetic property in an industrial setup and a convenient method for calibrating the device. © 2010 IEEE. Source


Damhof F.,Corus Research Development and Technology | Brekelmans W.A.M.,TU Eindhoven | Geers M.G.D.,TU Eindhoven
Engineering Fracture Mechanics | Year: 2011

In this paper, rate dependent evolution laws are identified and characterized to model the mechanical (elasticity-based) and thermal damage occurring in coarse grain refractory material subject to cyclic thermal shock. The interacting mechanisms for elastic deformation driven damage induced by temperature gradients and thermal damage induced by isotropic thermal expansion are combined and represented by a single variable for the total damage. The constitutive model includes the shielding of micro-structural thermal damage by the non-local elasticity-based damage developed at the macroscopic and microscopic scale. Quasi-stationary thermal experiments are used to identify the parameters used in the evolution law for thermal damage. The remaining model parameters, including a micro-structural length scale, are quantified by inverse modelling of cyclic thermal shock experiments. Longitudinal wave propagation measurements through damaged material are simulated, enabling the identification on the basis of the first and second thermal shock cycle. A third thermal shock cycle enabled the evaluation of the quality of the obtained parameter set. The set-up of the thermal shock experiments has been optimized through a parameter identifiability analysis. The damage evolution in three consecutive thermal shock cycles is investigated numerically with the optimized model. © 2011 Elsevier Ltd. Source


Szala E.,Corus Research Development and Technology | Wainer M.,Corus Research Development and Technology | Vieregge K.,Aleris Aluminum Koblenz GmbH
Surface and Interface Analysis | Year: 2010

Nowadays, automotive heat exchangers are mainly made from aluminum. Over the last few decades, the development of aluminum brazing sheet has been mainly focused on the improvement of the external corrosion resistance. Recently, the interest of the heat exchanger manufacturers has also moved toward the assessment of the internal corrosion resistance. Accelerated tests are used to simulate in-service conditions. These tests are crucial as they provide information to predict the material and product performance. Various internal corrosion tests have been developed, the so-called 'OY water tests'. Among all companies, the testing parameters can be varied in terms of ion concentrations or pH. Although the OY water tests are constantly being improved, there is so far no common internal corrosion standard as existing for external corrosion assessment. The present work aims at providing better understanding corrosion mechanisms encountered in the OY water media. The role of various elements present in the solution, cupric, chloride, sulfate ions, has been determined. These parameters were assessed via immersion testing. In order to get better understanding of the corrosion mechanism, electrochemical analysis combined with SEM characterization was carried out. The electrochemical analysis enables the understanding of the thermodynamics and kinetics of the corrosion process while immersion tests are performed to quantify the level of corrosion and follow the surface evolution over time. Copyright © 2010 John Wiley & Sons, Ltd. Source


Carless S.,Corus Research Development and Technology | Westendorp A.,Corus Strip Products IJmuiden | Kamperman A.,Corus Research Development and Technology | Brockhoff J.,Corus Strip Products IJmuiden
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2010

As casting speeds increase, the requirements for stable heat transfer and lubrication become increasingly stringent. This paper gives an overview of the techniques used and tools developed at Corus IJmuiden to monitor process stability with the purpose of increasing casting speed whilst minimising surface cracking. The Mould Stability Index has been used to benchmark the surface cracking or sticker sensitivity of the current product mix and to optimise process conditions, giving a significant reduction in the occurrence of longitudinal crack defects. Thermal Heat Maps have also been developed to measured process stability in real time. This has proven to be a useful tool in the study of the impact of parameters such as mould oscillation, SEN operation, argon practice and mould powder on process stability. Source

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