1. The base material is different.
An ordinary cold-rolled sheet is a product obtained from a hot-rolled sheet by cold pressing. Due to repeated cold rolling, its surface quality is better than that of the hot-rolled sheet, and good mechanical properties can be obtained after heat treatment.
2. The physical properties are different.
Hot-dip galvanized steel is more resistant to corrosion than cold-rolled steel. The characteristics of hot-dip galvanized steel sheets are strong corrosion resistance, good surface quality, favorable for deep processing, economic and practical. However, the draw ability of hot-dip galvanized steel is not as reliable as that of cold-rolled steel. In addition, Hot-dip galvanized steel is not as easy to weld as cold-rolled steel, and the zinc layer is easy to be damaged during welding.
3. The physical characteristics of the surface are different.
Galvanized is white. Cold rolled is black. The hardness is similar, and the performance is quite different. Generally, the galvanized sheet is not processed after processing because the surface has good oxidization, but the cold-rolled sheet is not good, and the surface paint must be done well. Otherwise, it will oxidize.
4, The process is different.
Because cold-rolled sheets have no heating in the production process, there are no defects such as pitting and iron oxide scale that often occur in HRC, and the surface quality is good. Moreover, the dimensional accuracy of cold-rolled products is high. The performance and structure of the products can meet some special requirements, such as electromagnetic properties, deep drawing properties, etc. Galvanized sheet refers to a steel sheet plated with a layer of zinc on the surface. Galvanizing is a commonly used, cost-effective method of rust prevention, and about half of the world’s zinc production is used for this process.
