Towards High Speed Galvanizing – Mastering Wiping Conditions Using Hydrodynamic Pads Strip Stabilization
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Increasing the speed of galvanizing lines for reducing their production costs is challenging while maintaining a high coating quality demanded by steel customers. Several issues arising at bath area prevent such speed increase up to or above 200 m/min. Among these issues, corrosion and wear of the immersed hardware, skimming volumes, and wiping conditions are predominant. Regarding the last limitation, the RFCS European project “High Speed Galvanizing” aimed notably at developing a strip stabilization device that could act directly at the wiping level. During that project, CRM Group and its partners have pushed the limit of strip stabilization under TRL-5 conditions at low industrial speed on its Annealing and Hot-Dip Galvanizing Pilot Line. Thanks to a finite element model coupled to an optimization of damping parameters, both validated by measurements, hydrodynamic pads (WO2017129391), whose effects increase with strip speed, have been tested very close to the wiping level. Consequently, a flat and stable strip could be achieved right between air knives with extremely low residual displacements, even under forced vibrations representative of harsh industrial working conditions. The coated product so-obtained was characterized with a similar reduction of final coating thickness variations.
Abstract
Increasing the speed of galvanizing lines for reducing their production costs is challenging while maintaining a high coating quality demanded by steel customers. Several issues arising at bath area prevent such speed increase up to or above 200 m/min. Among these issues, corrosion and wear of the immersed hardware, skimming volumes, and wiping conditions are predominant. Regarding the last limitation, the RFCS European project “High Speed Galvanizing” aimed notably at developing a strip stabilization device that could act directly at the wiping level. During that project, CRM Group and its partners have pushed the limit of strip stabilization under TRL-5 conditions at low industrial speed on its Annealing and Hot-Dip Galvanizing Pilot Line. Thanks to a finite element model coupled to an optimization of damping parameters, both validated by measurements, hydrodynamic pads (WO2017129391), whose effects increase with strip speed, have been tested very close to the wiping level. Consequently, a flat and stable strip could be achieved right between air knives with extremely low residual displacements, even under forced vibrations representative of harsh industrial working conditions. The coated product so-obtained was characterized with a similar reduction of final coating thickness variations.