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The Difference Between Hot Dip Galvanized Steel Sheets and Cold Rolled Steels

All steel plate and pipe products contain two basic elements of carbon and iron, and there may be some composition differences and different manufacturing processes. Hot dip galvanized steel sheet and cold rolled steel are similar steels with unique properties and applications. 


Galvanized steel sheet is divided into two categories according to the production mode: 1. Electro-galvanized sheet: a kind of galvanized sheet produced by making zinc ions generate electrons through the electrolyte containing zinc ions to form zinc deposition on the surface of strip steel. 2. Hot-dip galvanized sheet: galvanized sheet made by immersing cold-rolled or hot-rolled steel strip in molten zinc bath on continuous hot-dip galvanized production line.


1. Definition Difference between hot-dip galvanized steel sheet and cold rolled steel


Hot dip galvanized steel sheet is usually called hot-dip galvanized steel sheet. As the name implies, hot dip galvanized steel sheet is formed by sinking the steel into molten zinc and then rapidly oxidizing the zinc layer in the open air. Compared with iron, zinc has lower activity in the redox process, which is why the zinc layer can protect steel products in our lives and is so popular. As one of the most professional pre painted steel coil suppliers, EAST STEEL can provide you with the regular spangle galvanized steel, small spun galvanised steel, and zero spangles galvanized steel coil.


Definition of cold rolled steel: cold rolling and hot rolling processes are two forming methods of steel. Cold-rolled products have higher dimensional accuracy and are suitable for more applications with high dimensional requirements. Cold rolling occurs below the crystallization temperature. It is controlled by different types of rolls. The basic products are cold-rolled sheets and cold-rolled coil. Other shapes can also be formed, such as cylinder, I-beam and pipe.


2. Difference between hot dip galvanized steel sheet and cold rolled steel


Can cold rolled steel be galvanized? The answer is yes. Hot dip galvanized steel sheet and cold rolled steel are two different processing methods. Hot dip galvanized steel sheet and cold rolled steel are used for different purposes, one for forming and the other for preventing corrosion. The only limitation of hot dip galvanized steel sheet is that it cannot be used under high-temperature conditions. If the surface is scratched, the zinc layer will lose protection at the scratch point.


Strength comparison between hot dip galvanized steel sheet coil and cold rolled steel coil. Hot dip galvanized steel sheet products can be produced with cold rolled and hot rolled steel. Generally, the yield strength of hot dip galvanized steel sheet coil is better than that of cold rolled steel, because the cold rolled process destroys the grain structure of steel, and the hot dip galvanized steel sheet coil improves the grain structure. Cold rolled steel has better surface conditions than hot dip galvanized steel sheet coil. Hot dip galvanized steel sheet and cold rolled steel have their own advantages. When selecting, you should select the appropriate steel according to your different uses.

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