- Scalping: to remove surface defects such as segregation, slag inclusion, scars, and surface cracks, and improve the surface quality of the sheet. The scalping machine mills both sides and edges of the slab, with a milling speed of 0.2m/s. The maximum thickness to be milled is 6mm, and the weight of the aluminum scraps produced is 383kg per slab, with an aluminum yield of 32.8kg. - Heating: the scalped slab is then heated in a pusher-type furnace at a temperature of 350℃ to 550℃ for 5-8 hours. The furnace is equipped with 5 zones, each with a high-flow air circulation fan installed on the top. The fan operates at a speed of 10-20m/s, consuming 20m3/min of compressed air. There are also 20 natural gas burners installed on the upper part of the furnace, consuming approximately 1200Nm3/h of natural gas. - Hot Rough Rolling: the heated slab is fed into a reversible hot rolling mill, where it undergoes 5 to 13 passes to be reduced to a thickness of 20 to 160mm. - Hot Precision Rolling: the rough rolled plate is further processed in a hot precision rolling mill, with a maximum rolling speed of 480m/s. It undergoes 10 to 18 passes to produce plates or coils with a thickness of 2.5 to 16mm..
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