All steel sheet and tube products contain 2 basic elements - carbon and iron - and may have some compositional differences and various manufacturing processes. In the case of hot-dipped galvanized steel coils and cold rolled steel coils, they are similar steel products with unique properties and applications.
Often referred to as hot-dipped galvanised steel, galvanised steel is produced, as the name suggests, by immersing the steel product in molten zinc, the zinc layer then being rapidly oxidised in the open air. Compared to iron, zinc is less reactive in the redox process, which is why it is so popular as the zinc layer protects the steel in our lives.
Cold rolling and hot rolling processes are two methods of forming steel. Cold rolled products have a higher degree of product dimensional accuracy and are suitable for applications with high dimensional requirements. Cold rolling occurs below the crystallisation temperature and is controlled by different types of rolls. The basic product is cold rolled sheet and coil, which can also be formed into other shapes such as cylinders, I-beams and tubes.
Can cold rolled steel products be galvanised? The answer is yes, they are two different processes used for different purposes, one for forming and the other for corrosion protection. The only limitation of galvanised steel is that it cannot be used in high temperature conditions and if the surface is scratched, the zinc layer will lose its protection at the point of scratching.
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