Hot Dip Galvanizing

Technical specification

Technology description

Since March 2004, ERLEN has been carrying out hot-dip galvanizing in its own galvanizing plant located in Fulnek on the site of the former ROMO plant.

The galvanizing plant is unique for its “wet zinc” technology, which achieves exceptional quality of galvanized goods. Hot-dip galvanizing provides long-term anti-corrosion protection for steel products. Steel components are dechlorinated in hydrochloric acid to remove rust, scale and impurities. The demoralised material is fed into molten zinc via ammonium chloride, where the zinc is applied to the goods. The uniqueness of the “wet zinc” technology lies in the fact that the ammonium chloride is placed directly over a portion of the molten zinc (the mirror), thus preventing oxidation of the iron in the galvanizing process. Products galvanized in this way have a high gloss and exceptional surface quality.

The graph shows the ideal silicon content in iron, where a content from 0-0.3% and from 0.12-0.2% Si is ideal for the quality of the zinc layer.

Zinc coating options

Hot-dip galvanizing Fulnek (wet method; tub: 3.1 m x 1.1 m x 1.4 m)
Hot-dip galvanizing cooperation (dry method; tub: 12.6 m x 1.4 m x 2.6 m
and 6.5 m x 1.4 m x 3 m)
We also provide hot-dip galvanizing on bathtubs with dimensions (12.4 m x 2.85 m x 3.1 m
and 16.2 m x 1.9 m x 2.75 m)

Requirements for input material

The quality of the galvanized material, and thus the satisfaction of our customers, is our primary goal. In order to supply the best quality material, we need to follow certain input material guidelines. These principles are governed by EN ISO 1461 and EN ISO 14713-1 for hot dip galvanizing. In particular, the input material should meet the following criteria:

The surface is free of paint and dirt after welding
Input parts are not welded flat
Input material is not supplied in an expanded form
Input material has holes that allow it to be hung
The hollow parts shall be provided with a sufficient number of suitably located drainage holes of the appropriate size
The inlet material shall, as far as possible, have a symmetrical cross-section
Bends, dents, sheet piling, etc., must allow for expansion of the material
Material with very different wall thicknesses is not suitable
Defects in galvanisation may be affected by greasy or porous surfaces
The use of quenched steel may result in a thick and brittle coating
Zinc coating will cause the holes for the bolts to shrink, so drill them 2 mm above the nominal size
Hot-dip galvanised structures should be supplemented with hot-dip galvanised fasteners

If you are in any doubt about the properties of the material you are supplying for galvanizing, please contact our professionals who will be happy to provide you with expert assistance.

References

Steps

Connecting rods

Treads

Irrigation systems parts

Pump components

Mechanical parts

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