E-Thesis 343 views 52 downloads
Modelling of High Temperature Hot-Rolled Steel / AHMAD SAJJAD
Swansea University Author: AHMAD SAJJAD
Abstract
The coilbox is a non-compulsory process used in hot strip milling to produce diverse alloys of hot-rolled steel products. Unlike other hot strip processes, the Coilbox is a passive process usually placed between the roughing and finishing mills which does not introduce any extra heat or mechanical s...
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Swansea, Wales, UK
2023
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| Institution: | Swansea University |
| Degree level: | Master of Research |
| Degree name: | MSc by Research |
| Supervisor: | Lavery, Nicholas. and Brown, Steve. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa64635 |
| Abstract: |
The coilbox is a non-compulsory process used in hot strip milling to produce diverse alloys of hot-rolled steel products. Unlike other hot strip processes, the Coilbox is a passive process usually placed between the roughing and finishing mills which does not introduce any extra heat or mechanical stress into the steel strip. The coilbox wraps the steel strip around itself, forming a tight coil and shortening the overall length of the steel strip, and in turn, reduces the overall size of the hot strip mill. The coilbox also reduces heat loss from the steel strip by reducing the total surface area exposed to the environment. Lastly, the coilbox allows the strip to be stored temporarily on the mill while still hot in case of a fault or congestion ahead. Temperature control throughout the hot strip milling process is essential to ensure the end steel product has the correct and expected mechanical properties. Temperatures too high or low can introduce unexpected stresses and damage mill equipment. Due to the importance of temperature control, many mills have thermal models or simulation software that predict the temperature of the steel strip throughout every stage of the milling process. Thermal models of the hot strip are often implemented in-house and specific to manufacturers' requirements and setups. TATA Steel is no different, having developed a strip mill simulation software called TiTAN. This study looks at modifying and implementing a thermal model into TiTAN using the finite element method to allow the user to test and understand the thermal losses of a steel strip as it passes through the coilbox. TiTAN is a quick and efficient modelling software for hot and cold strip mills, although currently, it cannot model temperature changes that may occur during the coilbox process. TATA Steel would like to implement a new module into TiTAN that would allow this functionality. The new model must integrate seamlessly with TiTAN whilst also accurately modelling the steel strip temperature up to 80% of the actual temperature of the steel strip as measured from on-site data. Temperature data from TATA Steels Port Talbot site were analysed to understand the thermal properties of the strip as it passes through the coilbox. Furthermore, how the strip moves through the coilbox was studied to determine if the physical properties of the strip, such as position and speed, would impact the temperature. After building up a good understanding of the properties of the strip as it passes through the coilbox, a model of the coilbox process was developed in TiTAN. |
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| Keywords: |
Finite Element Method, Hot Strip Mill, Heat Transfer, Simulation, Coilbox |
| College: |
Faculty of Science and Engineering |