From the material, hot galvanized sheet and cold galvanized sheet two galvanized sheet composition are basically similar. The difference is that the cold galvanized sheet is thinner than the hot galvanized sheet, the surface quality is better, the process is more complex. The price is higher.
From the point of view of the process, the steel is sent hot rolling by casting billet rolling, rolling into a certain thickness of the plate, such as the thickness of about 10mm, if the user has no higher requirements on the surface of the plate, thickness, mechanical strength, can be finished product processing, such as galvanized and so on, direct sale, is hot plate. If there is a higher requirement for the plate, then the hot rolled plate is sent to the cold rolling line for re-processing, after pickling, annealing, rolling again and other processes, to get thinner, smooth surface, better mechanical properties of the cold rolled plate.
Galvanizing method of hot dip galvanized sheet:
Hydrogen reduction galvanizing hydrogen reduction galvanizing was invented in 1937. Hydrogen reduction galvanizing laid the foundation of modern continuous hot galvanizing. The product produced by hydrogen reduction method has better appearance quality and bonding force of galvanizing layer than that produced by solvent method. Reduction process of galvanized into heating reduction furnace in steel strip after pickling, with hydrogen reduction after pickling of oxide film, and make the steel plate surface produces in the process of heating reduction a spongy layer of reduction zone, after entering zinc pot, can produce a two-way binding force is good, uniform zinc alloy layer, greatly increased the zinc layer adhesion, it also determines the galvanizing energy consumption cost is higher.
Galvanizing by ammonium chloride solvent method galvanizing by ammonium chloride solvent method was invented in 1837. For the products produced by ammonium chloride solvent method, the adhesion between the appearance quality and the surface of galvanized layer is slightly worse than that by hydrogen reduction method, because there is no heating and reduction process of galvanizing by ammonium chloride solvent method. This also determines that the energy consumption cost of galvanizing method is lower than that of hydrogen reduction galvanizing method.
Post time: Jan-28-2022