Abstract
The production of hot-dip galvanized steel presents great challenges, because it is currently the main raw material in the manufacturing of automobiles, and its surface quality is fundamental for the construction of automobiles. Obtaining the best surface appearance in galvanized steels is directly related to understanding the phenomena involved in the galvanizing process. In this process, achieving thermal and chemical stability of the galvanizing pot means keeping top-dross formation under control. The top-dross is the main problem to be controlled, because it impacts the surface quality of coated steel. Some studies have been conducted to understand the formation of top-dross particles into the zinc bath, but little is known about the path of the particles formed from the melting ingots. In this study, the trajectories of these particles were simulated. It has been found that, depending on the immersion depth, dross particles may have different destinations.
Highlights
In response to the large increase in the use of non-ferrous and non-metallic materials by manufacturers of automobiles in the construction of its models seeking weight reduction and making the most efficient vehicles, the steel industries have developed new steel
The speeds found throughout the zinc bath ranged from 1x10-4 m/s to 2.5 m/s, with the lowest speeds being in the regions close to the bottom of the pot and the highest speeds close to the strip
In region 7 the upward flow ends and becomes a vortex close to the bath surface. With all this internal motion in the zinc bath it is possible to understand that dross particles formed may follow different directions until they precipitate on the surface of the pot
Summary
In response to the large increase in the use of non-ferrous and non-metallic materials by manufacturers of automobiles in the construction of its models seeking weight reduction and making the most efficient vehicles, the steel industries have developed new steel. Computational models were used using computer simulation software, the most common being CFD (Computational Fluid Dynamics) such as Ansys CFX or Fluent, which use the finite volume method for modeling and calculation These models have a high potential to represent industrial process conditions and facilitate the understanding of the phenomena involved in the galvanizing process without the need to carry out industrial tests that could jeopardize production, product quality and increase operating costs. Materials Research effects, without the need to carry out such modifications in an industrial pot that require a high investment and time As it is already known, it is not possible to prevent the formation of dross in the zinc pot, but only to control it[8]. The aim of the present study is to map, through computer simulation, the trajectories of top-dross particles generated from different levels of immersion of the zinc ingot and compare the results with data from a different industrial plant
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