Galvanized sheet materials can be divided into categories according to cold-rolled and hot-rolled galvanized sheet galvanized sheet. The most common is the cold-rolled galvanized sheet, the raw material after hot rolling and cold rolling process also pickled. Therefore, the thickness of the small and relatively smooth surface, suitable for most purposes. But with the development of economy and technology, many applications require thicker galvanized sheet. If its surface do not ask, you can use the direct hot-rolled plate galvanized.
Hot-rolled galvanized sheet thickness is generally 2 ~ 4mm, width 1000 ~ 1600mm, and cold-rolled galvanized sheet specifications of the coverage area of ​​the cross is not great, so interchangeability is not too strong. Its biggest advantage is the raw material without cold working, so the price is cheaper, lower production costs. Its process is characterized by the use of pre-pickling process, rather than the caustic, no recrystallization annealing in a furnace, as long as you can reach the iron oxide reduction temperature, typically 550 ℃. Its products are characterized by a high roughness of the original board, galvanized thick coating process, a small spangle, thus galvanizing the amount is often larger, thinner coatings produced products more difficult. Meanwhile, the grain has not been cold-rolled sheet is broken refinement, poor mechanical properties, can not produce deep and ultra-deep leveling leveling products.