passivated galvanized reduction annealing furnace

Continuous hot-dip galvanized steel sheet referred galvanized sheet metal or white, is the thickness of 0.25 ~ 2.5mm cold-rolled continuous hot-dip galvanized steel sheet and strip, strip first preheat oven heated by a flame, burned surface residual oil, while generating the surface oxide film, and then enter the reduction annealing furnace containing H2, N2 mixed gas is heated to 710 ~ 920 ℃, iron oxide film is reduced to sponge iron, surface activation and purification of the strip is cooled to slightly above the melting after the temperature of zinc into zinc pot 450 ~ 460 ℃, the use of an air knife control surface zinc layer thickness. Finally chromate passivation solution to improve the resistance to white rust resistance.
Keywords: passivated galvanized reduction annealing furnace
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