Steel plate minimum spangle galvanizing spray art

Abstract

The invention discloses a steel plate minimum spangle galvanizing spray art, comprising that: the steel plate is heated by a heating stove and reduced to enter a zinc kettle for galvanizing and an air knife scrapes the excessive zinc liquor; the steel plate is sprayed and cooled by a minimum spangle machine on the surface to form a minimum spangle; the surface of the minimum spangle steel plate obtained in the step 2 is finished, wherein the diameter of the nozzle of the minimum spangle is 1.5-3 mm, water pressure is 1.5-4 bars, compressed-air pressure is 1.4-6 bars, the distance between the nozzle of the minimum spangle machine and the air knife is regulated to 400-600 mm, preferred 500 mm and the cooling water in the minimum spangle machine intake pipe is preheated to 30-50 DEG C. By checking-out, the plated surface spangle of the minimum spangle galvanizing steel plate removes the grain boundary and is suitable for subsequent coating. The subsequent coating plated surface is smoothand the oil paint quantity can be saved by 8% when the film thickness is 15 mum.

Description

Small spangle galvanizing spray process for steel plate technical field The invention belongs to the field of galvanizing metal steel sheets, in particular to a small spangle galvanizing spray process for galvanizing small spangles on steel plates. Background technique At present, on the steel plate galvanizing production line, when the steel plate is galvanized with small spangles, a small spangle machine is generally used to galvanize the steel sheets with small spangles. In the commonly used continuous hot-dip galvanizing production line for strip steel, the small spangle galvanizing device shown in Figure 1 is used, in which the strip steel is heated and reduced by the heating furnace and then enters the zinc pot for galvanizing, and the air knife scrapes off the excess Part of the zinc solution. Then it is cooled in the air to crystallize into common spangles or after spraying treatment, it is rapidly cooled and crystallized into small spangles. However, when the ex...

AI Technical Summary

Problems solved by technology

However, when the existing small spangle machine is galvanized, because the cooling rate is too fast, the spangle on the surface of the steel plate is often disordered and uneven, and even many white spots are generated.

At the same time, because water has a certain viscosity, it will affect the atomization. Moreover, the diameter of the water droplets sprayed by the air mist nozzle of the small spangle machine is large and will cause dripping, which makes it easier to make the spangles on the surface of the steel plate after atomization large and Uneven, and produce obvious white spots, even after the subsequent finishing process, there are often spangle grain boundaries on the surface of the board, which seriously affects the quality of the subsequent painting process, resulting in waste of paint

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