Hot-dip galvanized sheet

Hot-dip galvanized sheet has a range of applications, including in construction, the automotive industry, bridge building and the energy sector. Its high durability and ability to withstand the most demanding environmental conditions make it a material choice of the highest rank in a variety of industrial contexts. Hot-dip galvanizing is an essential process in the metal industry, especially for sheet steel, where it provides effective, long-lasting protection against corrosion.
The process involves dipping the steel sheet into a container filled with molten zinc, at a temperature of around 450°C. Zinc and steel interact chemically at this temperature, resulting in a protective zinc alloy on the surface of the steel.

​​​​​​​ Unlike electric galvanizing, hot-dip galvanizing forms a thick layer. This protective layer gives the steel plate excellent corrosion protection over a longer period of time. In addition, the zinc layer also improves the aesthetics of the steel by giving it a smooth and shiny surface.

​​​​​​​Another advantage is that the surface, even after scratches and minor damage, continues to protect the steel against corrosion, thanks to zinc's "self-healing" properties.

what can huddinge stål do

Hot-dip galvanized sheet is flexible when it comes to design and construction.

We at Huddinge stål offer quality assignments in sheet metal cutting and welding. We can then hot-dip galvanize or galvanize the sheet, which can then be painted if desired. The plate is cut using band saws and circular saws.

We have optically controlled cutting machines that enable finely cut details. We deliver forged blanks in various shapes and qualities. We cut, and cut, to the dimensions and angles you need for your plates.

At Huddinge stål, we have access to IWS competence for welding supervision for EXC2 fully in accordance with SS EN 1090-2. We also paint constructions with a length of up to 22 meters and a width of up to 4 meters. The painting takes place in Huddinge and we do both base painting and varnishing, class 1 to 5.

painting Hot-dip galvanized sheet

Although hot-dip galvanizing by itself usually provides completely satisfactory corrosion protection, reinforcement may sometimes be desirable in certain aggressive environments. In these cases, a Duplex solution (hot-dip galvanizing and painting) may be desirable.

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welding Hot-dip galvanized sheet

Hot-dip galvanized sheet can be welded. The problem is that toxic fumes are formed when you sweat. This must be taken into account and the work should be carried out with great care.

Optimally, welding is done first and hot-dip galvanizing afterwards.

corrosivity class Hot-dip galvanized sheet

According to Nordicgalvanisers, which specializes in this area, there is the standard EN ISO 12944-2, the corrosivity classes C1 to CX are specified. Each class refers to an environment with a different impact on the material, where C1 has the lowest impact and C5 and CX have the highest.

For each corrosivity class, the amount of steel and zinc that corrodes away per year is shown.

corrosivity class C1, C2, C3

In these environments, even the thinner screed thicknesses provide long and reliable protection.

corrosivity class C4

In these environments, increased layer thicknesses should be used unless regular maintenance can be done on the product, in which case the thinner layer can be used.

corrosivity class C5

In these environments, the thinner layer should not be used. In these environments, often marine environments, Duplex treatment should be used. See Nordicgalvanisers for more information.

what is the lifespan of Hot-dip galvanized sheet?

The lifespan of hot-dip galvanized steel is between 60 and 80 years. Hot-dip galvanized steel should not be used alone in marine environments as the zinc will be consumed more quickly due to galvanic currents. The same applies to contact with aluminum over time. Hot-dip galvanized steel should therefore only be used, bolted with stainless or hot-dip galvanized steel.

Hot-dip galvanized sheet rust

Although hot-dip galvanized sheet provides good protection against rust, rust can still occur. This is particularly a problem in marine environments. If rust occurs, this should be remedied by maintenance. If the rust is recurrent, a higher layer thickness should be used, alternatively a duplex solution (galvanizing and painting).