In the conventional trading of galvanized steel sheets, cold-rolled basic galvanizing is the main one, and hot-rolled substrates are relatively rare. So, what is the difference between hot-rolled substrates and cold-rolled substrates galvanized products? Let's make a simple interpretation from the following aspects:
1. Cost
Because there is one less process than cold-rolled substrates, the production cost of galvanizing hot-rolled substrates is lower than that of cold-rolling, mainly due to the annealing cost and cold-rolling cost. 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 adhesion of the zinc layer is better, and the thickness of the coating is biased towards 140/140g/m2. However, the thickness dimension is not as high as that of cold rolling. Since most of the zinc layers are thick, the thickness of the zinc layer is not uniform. There is little difference in mechanical properties, and some properties are even better than cold rolled.
3. Application areas
Hot-rolled base plate galvanized steel sheet is not as good as cold-rolled base plate because of its dimensional accuracy and surface quality, and is thicker than cold-rolled galvanized sheet, so it is often used for structural components with low surface requirements but high strength and thickness requirements.
For example, the structural parts of washing machines, refrigerators and other household appliances, automobile internal structural parts, automobile chassis structural parts, passenger car body, roof, highway guardrail, cold-formed steel, etc.
Because the cost of hot-rolled galvanized sheet is low, and with the progress of technology, the thickness of specifications is getting larger and larger, and the amount of use is gradually increasing.
