NUMERICAL ANALYSIS OF EDGE OVER COATING AND BAFFLE EFFECT ON HOT-DIP GALVANIZING

Chengren Bao (), Yonglin Kang and Yan Li
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Chengren Bao: Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
Yonglin Kang: Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
Yan Li: #x2020;Shougang Jingtang United Iron & Steel Co., Ltd., Hebei, Tangshan 063200, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 01, 1-7

Abstract: In hot-dip galvanizing process, air jet wiping control is so crucial to determine the coating thickness and uniformity of the zinc layer on the steel strip. A numerical simulation of gas-jet wiping in hot-dip galvanizing was conducted to minimize the occurrence of edge over coating (EOC). The causes of EOC were identified by contrasting and analyzing the airflow fields on the strip edge with and without a baffle. The factors influencing the airflow field on the strip edge during the change in the gap between the baffle and the strip edge were also analyzed. The effect of the distance between the air knife and the strip was evaluated. Technological parameters with on-site guidance role were obtained by combining them with the actual production to elucidate the role of the baffle in restraining the occurrence of EOC. The uniform distribution of pressure and coating thickness on the strip is achieved when the distance of the baffle from the strip edge is about 0.3 times of the jetting distance.

Keywords: Hot-dip galvanizing; baffle; edge over coating; flow field of edge; air knife (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X1750010X

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