1. Cost Because there is one less process than cold-rolled substrate, the production cost of hot-rolled substrate galvanizing is lower than that of cold-rolled substrate, mainly annealing cost and cold-rolling rolling cost, and the other processes are similar.
2. Quality performance Because the hot-rolled substrate is only pickled and annealed to remove surface impurities, its surface is relatively rough, the zinc layer has good adhesion, and the coating thickness tends to be 140/140g/m2. However, the thickness size is not as accurate as cold-rolled, and since most of them are thick zinc layers, the zinc layer thickness control is also uneven. There is not much difference in mechanical properties, and some properties are even better than cold-rolled ones.
3. Application field Because the dimensional accuracy and surface quality of hot-rolled substrate galvanized steel sheet are not as good as those of cold-rolled substrate, and the thickness is thicker than cold-rolled galvanized steel sheet, it is often used in structural components with low surface requirements but high strength and thickness requirements. For example, structural parts of home appliances such as washing machines and refrigerators, internal structural parts of automobiles, structural parts of automobile chassis, passenger car bodies, roofs, highway guardrails, cold-bent steel, etc. Because the cost of hot-rolled galvanized steel sheets is low, and with the progress of technology, the thickness of specifications is getting larger and larger, and the usage is gradually increasing.
4. Brands Common brands of hot-rolled galvanized steel sheets are DD51D+Z, HD340LAD+Z, HR340LA, HR420LA, HR550LA, etc.; the corresponding brands of cold-rolled galvanized steel sheets are DC51D+Z, HC340LAD+Z, HC340LA, HC420LA, HC550LA, etc.; there is also a brand that does not specify whether it is a cold-rolled or hot-rolled substrate, such as DX51D+Z, which can generally be considered as a hot-rolled galvanized steel sheet.
Post time: Oct-14-2024