Analysis of Roll Gap Heat Transfers in Hot Steel Strip Rolling through Roll Temperature Sensors and Heat Transfer Models

Legrand, Nicolas; Labbe, Nathalie; Weisz-Patrault, Daniel; Ehrlacher, Alain; Luks, Tomáš; Horský, Jaroslav

doi:10.4028/www.scientific.net/kem.504-506.1043

Cited by 15 publications

(10 citation statements)

References 3 publications

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“…With the ever-increasing demands on the steel industry to lower emissions and increase efficiency comes the equally demanding requirements for a higher quality product. This is leading to an increase in the number of sensors and monitoring devices used in the steelmaking process [1][2][3], whereby particular focus has been during the rolling process, where roll force, strip thickness, and even phase transformation after rolling (austenite to ferrite) can be monitored [4][5][6][7][8]. However, the conditions for higher temperature process monitoring are more challenging, for example, during casting or thermo-mechanical processing, but there is demand for real-time feedback to allow consistent and high quality steel to be produced.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the Solidification of a Molten Steel Surface Using Infrared Thermography

Slater

Hechu

Davis

et al. 2019

Metals

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Infrared thermography provides an option for characterising surface reactions and their effects on the solidification of steel under different gas atmospheres. In this work, infrared thermography has been used during solidification of Twin Induced Plasticity (TWIP) steel in argon, carbon dioxide and nitrogen atmospheres using a confocal scanning laser microscope (CSLM). It was found that surface reactions resulted in a solid oxide film (in carbon dioxide) and decarburisation, along with surface graphite formation (in nitrogen). In both cases the emissivity and, hence, the cooling rate of the steel was affected in distinct ways. Differences in nucleation conditions (free surface in argon compared to surface oxide/graphite in carbon dioxide/nitrogen) as well as chemical composition changes (decarburisation) affected the liquidus and solidus temperatures, which were detected by thermal imaging from the thermal profile measured.

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Section: Introductionmentioning

confidence: 99%

Characterisation of the Solidification of a Molten Steel Surface Using Infrared Thermography

Slater

Hechu

Davis

et al. 2019

Metals

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“…In the field of semi-analytical inverse methods one can mention some works (elasticity and thermal problem) adapted for rolling process developed by Weisz-Patrault et al (2011, 2012a, 2013a) in 2D and Weisz-Patrault et al (2013b, 2014b in 3D. Moreover thermal experimental studies partially dedicated to the design of the measurement system have been proposed on this basis by Weisz-Patrault et al (2012b) and Legrand et al (2012Legrand et al ( , 2013. However this paper deals with a more complicated shape (cylinder with a not centered hole).…”

Section: Introductionmentioning

confidence: 96%

Inverse Cauchy method with conformal mapping: Application to latent flatness defect detection during rolling process

Weisz-Patrault

2015

International Journal of Solids and Structures

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a b s t r a c tIn this paper a semi-analytical inverse Cauchy problem is presented for a finite cylinder with a cylindrical hole under the surface called the detecting roll. Applications to latent flatness defect detection during rolling process are considered. A steel strip wraps at a known angle around the detecting roll. The presented inverse method aims at evaluating the residual stress profile of the strip. The inputs are the displacements and free surface traction at the hole surface and the outputs are the resultant forces per unit length in the contact between the strip and the roll, thus by equilibrium of the strip the residual stress profile is inferred. This paper is based on plane complex elasticity with conformal mapping techniques. Several 2D-computations are performed at several axial positions. This work is theoretical, the measurement device is not available and technical issues are not broached. Some numerical examples with synthetic data are provided in order to evaluate accuracy and noise sensitivity. Results encourage further investigations and technical developments.

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“…An extension in three dimensions (with several points aligned along the roll axis) has been also developed by Weisz-Patrault et al (2013b) for stresses and Weisz-Patrault et al (2014b) for temperature. Pilot tests have been performed for thermal inverse problems dedicated to heat flux determination in the roll gap by Weisz-Patrault et al (2012b) and Legrand et al (2012a) with detailed experimental apparatus (insertion of the thermocouple under the roll surface etc...) and calibration procedures, and by Legrand et al (2013) with a specific study on thermal fatigue of rolls. More recently, Weisz-Patrault (2015) proposed a semi-analytical inverse method based on conformal mapping techniques applied for latent flatness defect detection during rolling process.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of contact stress during cold rolling process with optical fiber Bragg gratings sensors measurements and fast inverse method

Weisz-Patrault

Maurin

Legrand

et al. 2015

Journal of Materials Processing Technology

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International audienceThere is a strategic importance for the steel rolling industry to get a better understanding of the strip–roll interaction to improve roll-gap models, increase strip quality and decrease roll degradation. This requires roll-gap sensors able to measure this interaction under industrial rolling conditions and in real time in order to propose a feed-back control of process parameters. To reach these goals, this paper proposes a new roll-gap friction sensor based on an inverse method that interprets optical fiber Bragg gratings(FBG) strain measurements under the roll surface (fully embedded), which enables to evaluate contact stresses with very short computation times, compatible with real time interpretation. This elastic inverse method is analytical and relies on plane-strain and isothermal assumptions. The experimental apparatus is detailed, technical issues are clearly exposed as well as calibration procedures. Several pilot cold rolling tests have been performed at various rolling speeds and different strip thicknesses in order to demonstrate the industrial feasibility. Resulting evaluations of contact stresses are then compared with numerical simulations. Reasonable agreement is obtained for normal stress (i.e., pressure) but not for shear stress(only an order of magnitude is obtained)

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Analysis of Roll Gap Heat Transfers in Hot Steel Strip Rolling through Roll Temperature Sensors and Heat Transfer Models

Cited by 15 publications

References 3 publications

Characterisation of the Solidification of a Molten Steel Surface Using Infrared Thermography

Characterisation of the Solidification of a Molten Steel Surface Using Infrared Thermography

Inverse Cauchy method with conformal mapping: Application to latent flatness defect detection during rolling process

Experimental evaluation of contact stress during cold rolling process with optical fiber Bragg gratings sensors measurements and fast inverse method

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