Conveners
HDG Coating Weight Control by Nozzle Design & Settings
- Jaap van Eenennaam (Tata Steel Europe Research&Development)
- Owen Pearcy
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MICHEL DUBOIS (CMI INDUSTRY)23/06/2021, 14:00HDG Process Technology - Furnace, Galvanizing Bath, Coating Weight ControlOral PresentationAfter some review of typical surface defects observed in CGL running at low speed and sometimes heavy coating, the solution of the Navier Stokes equation in that process window is analyzed and discussed. The liquid velocity profile is computed from NO wiping situation to classical wiping. The question of back flow in relation with line speed and coating weight is addressed. From the analysis,...Go to contribution page
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Joseph McDermid (McMaster University)23/06/2021, 14:20Process Technology - Pre/Post-Treatment (Strip Cleaning, Skin Passing, Passivation, Oiling)Oral Presentation
This study experimentally investigated the ability of a novel multi-slot air-knife design to reduce high-intensity tonal noise and produce thinner coating weights in the continuous galvanizing gas jet wiping process. Coating weight measurements were carried out over a wide range of operating conditions to correlate the effect of the multi-slot jet operating parameters on the final coating...
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Gentaro Takeda (JFE Steel Corporation)23/06/2021, 14:40HDG Process Technology - Furnace, Galvanizing Bath, Coating Weight ControlOral PresentationThe gas wiping is generally used for coating weight control of continuous galvanizing lines (CGL). The gas wiping is the method to scrape off the surplus plating liquid after immersing a steel sheet in the molten plating bath by a gas jet by a slim slot nozzle of one pair of steel sheet front and back. Extensive coating weight control is possible by coordinating gas jet pressure depending on...Go to contribution page
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Le Quang Phan (University of Wollongong)23/06/2021, 15:00Fundamentals on Gas - Metal Interfacial ReactionsOral PresentationThe variation of thin metallic coating thickness produced in continuous galvanizing lines (CGLs) is attributed partly to the fluctuations in both the spatial profile and gradient of the impingement wall pressure. A fluctuating pressure profile can significantly alter both the magnitude of the maximum pressure gradient doing the majority of the wiping work and its location. A wiping jet with...Go to contribution page
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Remi Valentin (ArcelorMittal Global R&D)23/06/2021, 15:20HDG Process Technology - Furnace, Galvanizing Bath, Coating Weight ControlOral PresentationFor decades, baffles became the standard tool to limit the edge effects of wiping in the hot dip galvanizing process (overcoating, splashing). Initially designed to highly reduce the noise caused by the interaction of the two opposite air jets, baffles exhibited as well benefits to master the quality of the wiping process along the edges. Each line acquired specific designs and setup to...Go to contribution page