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2023
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The use and attention of galvanized coils
Galvanized coil is a thin steel plate that is immersed in a molten zinc bath so that a layer of zinc adheres to the surface. Galvanized coils can be divided into hot-rolled galvanized coils and cold-rolled hot-dip galvanized coils. Currently, they are mainly produced by the continuous galvanizing process, that is, the coiled steel panels are continuously immersed in a plating bath containing molten zinc to make galvanized coils. steel plate.
Galvanized coil is a thin steel plate that is immersed in a molten zinc bath so that a layer of zinc adheres to the surface. Galvanized coils can be divided into hot-rolled galvanized coils and cold-rolled hot-dip galvanized coils. Currently, they are mainly produced by the continuous galvanizing process, that is, the coiled steel panels are continuously immersed in a plating bath containing molten zinc to make galvanized coils. steel plate.
Because galvanized coils have strong corrosion resistance, good surface quality, are conducive to deep processing, and are economical and practical, they are widely used in fields such as construction, home appliances, automobiles, containers, transportation, and household industries. Especially industries such as steel structure construction, automobile manufacturing, and steel warehouse manufacturing.
Defects of galvanized coils
Galvanized coils are prone to falling off, scratches, passivation spots, zinc particles, thick edges, air knife streaks, air knife scratches, exposed steel, inclusions, mechanical damage, poor steel base performance, wavy edges, curling, and size Defects such as discrepancies, embossing, inconsistent zinc layer thickness, roller marks, etc.
The main reasons for the peeling off of the zinc layer of galvanized coils are surface oxidation, silicon compounds, cold rolling emulsion too dirty, NOF section oxidation atmosphere and protective gas dew point too high, unreasonable air-fuel ratio, low hydrogen flow, and oxygen penetration into the furnace. The temperature of the strip entering the pot is low, the furnace pressure in the RWP section is low and the furnace door sucks air, the furnace temperature in the NOF section is low, the grease cannot be evaporated, the aluminum content of the zinc pot is low, the unit speed is too fast, the reduction is insufficient, and the zinc liquid The residence time is too short and the coating is too thick.
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