Coating Weight Reduction Technology in Gas Wiping of Hot-Dip Galvanizing on Steel Strip

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  • Kobayashi Hirokazu
    Steel Research Laboratory, JFE Steel Corporation Graduate School of Engineering, Osaka Metropolitan University
  • Takeda Gentaro
    Steel Research Laboratory, JFE Steel Corporation Graduate School of Regional Development and Creativity, Utsunomiya University
  • Katoh Kenji
    Graduate School of Engineering, Osaka Metropolitan University
  • Wakimoto Tatsuro
    Graduate School of Engineering, Osaka Metropolitan University

Bibliographic Information

Other Title
  • 溶融亜鉛鍍金ワイピングプロセスにおける薄膜化技術
  • ヨウユウ アエン メッキ ワイピングプロセス ニ オケル ハクマクカ ギジュツ

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Abstract

<p>In the gas wiping process for hot-dip galvanizing, the coating thickness has two thinning limits. The first is the limit due to splashing of the molten zinc liquid film, and the second is the thinning limit of the wiping capacity of the equipment.</p><p>In this study, we investigated the possibility that wiping efficiency is reduced by the effect of zinc solidification due to gas jet cooling by conducting a gas wiping experiment under various temperature conditions.</p><p>A galvanized steel strip with a width of 100 mm was immersed in a molten zinc bath in the air atmosphere. The steel strip was heated by induction heating or a gas burner, and the wiping gas was also heated.</p><p>The results clarified the fact that high temperature conditions improved gas wiping efficiency. It is suggested that high wiping efficiency is prevented by an increase in viscosity due to an increasing solid volume fraction in the liquid zinc film surface caused by microscopic solidification. In addition, it was also found that the development of the initial alloy layer reduced the liquid phase and prevented wiping.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 109 (9), 753-760, 2023-09-01

    The Iron and Steel Institute of Japan

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