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How to conduct the secondary heating of zinc plating

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The secondary heating on the surface of continuous hot-dip galvanized steel strip can make the galvanized layer on the surface of strip steel more practical anti-corrosion, thus providing opportunities and possibilities for the long-term application and maintenance of strip quality.

After the in-depth summary and Research on the production of galvanized steel pipe, the secondary heating technology of strip steel surface in continuous hot-dip galvanizing production line has been gradually developed, improved and matured to adjust the cooling rate and improve the process method of condensation line. The method is to install a heater with liquefied petroleum gas, gas, electricity and other heat sources above the gas knife after galvanizing and under the small zinc flake equipment, so as to make up for the influence of edge fast cooling effect, and the heating intensity is slightly higher on both sides and slightly lower in the middle. The condensation curve changes from parabola to flat shape and rises to a certain position. In normal solidification state, large and uniform zinc flake products can be produced. During rapid solidification, small zinc flakes with uniform size and color are formed.

Because a heater with liquefied petroleum gas, gas and electricity as heat source is installed above the gas knife after galvanizing and under the small zinc flake equipment, the surface of steel strip can be reheated again, the temperature of liquid zinc can be reduced, the corrosion of zinc pot and other parts is reduced, and the service life of the equipment is prolonged.


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