News

In the basic trading of galvanized steel sheets, cold rolling is basically dominated by hot galvanizing, and hot rolled substrates are very rare. So, what is the difference between hot rolled and cold rolled galvanized products? Let’s briefly explain the following areas:

1. Cost
Due to the lack of a process flow compared to cold rolled substrates, hot dip galvanizing of hot rolled substrates has a lower cost than cold rolling, mainly due to the cost of quenching and cold rolling, while other processes are similar.
2. Quality characteristics
Due to the fact that the hot-rolled substrate only undergoes acid pickling, passivation, and quenching to remove surface residues, its surface is relatively unsmooth, and the adhesion of the zinc layer is relatively good. The coating thickness is heavier than 140/140a/m2, but the thickness specification is not as precise as that of cold rolling, because most of the zinc layers are thick, and the zinc layer thickness manipulation is uneven. There is not much difference in physical performance, and even some performance improvements are better for cold cars
3. Main uses
For hot vehicles, galvanized steel sheets for base plates are often used for structural prefabricated components with low surface requirements but high compressive strength and thickness requirements because their overall dimensional accuracy and surface quality are not as good as those of cold rolled base plates, and their thickness should be thicker than that of cold rolled galvanized steel sheets,
For example, components of household appliances such as fully automatic washing machines and refrigerators, automotive internal components, chassis components, bus body parts, cast-in-situ slabs, highway guardrails, cold drawn steel sections, etc
Due to the low cost of hot-rolled galvanized steel sheets, and accompanied by technological progress, the thickness of specifications and models is also increasing, and the demand is gradually increasing.
4. Model
The common model of hot rolled galvanized steel plate is DD51DZ.HD340LADZ HR340LA HR420IA HR5501A, etc.:
The cold-rolled galvanized sheet is matched with DC51D Z.HC340LAD ZHC340LA, HC420LA, HC550LA, etc.:
There is also a model that is not specific to cold-rolled or hot-rolled substrates, such as DX51D Z, which can generally be considered as hot-rolled galvanized sheet.