GRANITE® HDX (55 µm)

Rugged, organically coated flat steel from Stahl-Service Westhoff in cooperation with ArcelorMittal.

Granite® HDX is perfectly suited for exterior applications in construction such as for roofs and façades, since this specially developed coating system has no problems with withstanding all kinds of weather conditions, be it the harsh, cold and wet climate of the North or the hot sunny weather of the South that comes with high levels of UV radiation. Achieving the best-possible corrosion resistance category (RC 5) as well as the highest UV resistance category (RUV 4) enables us to guarantee this top quality product for up to 30 years.

Granite® HDX also proves to be the best choice for use in industrial regions in which the air is often highly polluted. The lightly grained surface ensures excellently rugged handling and processing characteristics so that Granite® HDX can easily be further processed in “cold forming” or “deep drawing” processes (canted, bent, punched and so on) without damaging the surface. 

For example, it is possible to shape Granite® HDX material to form profiled steel sheets, sandwich panels, cassettes, profiles, slats or other narrow profile elements. Furthermore, the lightly grained surface is responsible for the extremely aesthetic satin gloss finish of 30 GU (gloss units – Gardner 60°); that applies above all to the four colours available off-the-shelf from SSW Stahl-Service Westhoff (see below).


Coating composition – Granite® HDX

Coating composition – Granite® HDX
Coating composition – Granite® HDX


Thickness 0.75 mm
Width 1.250 mm
Thickness of paint coating 55 μm
Metallic coating Z275
Substrate material S220GD + Z275
UV resistance RUV4
Corrosion resistance RC5
Fire resistance European standard (EN 13501-1) A1, French standard (FD P92-507) MO, British standard (BS 476) AA

Coil coating

The coil coating process coats flat sheets (coils) with liquid paint. Coil coating is the most economic, environment-friendly and reliable process there is for producing coated materials in large amounts. The distinguishing features of the final coil-coated product are high corrosion resistance, good formability as well as a decorative and high-quality appearance. The multi-layer composition of the paint coating is produced with absolute uniformity in a continuous process on state-of-the-art systems that maintain process conditions at a constant level (see above graphic). After being cleaned, degreased, rinsed, pretreated and rinsed again, the galvanised steel core is forwarded for a priming coat (primer) to be applied and then finally coated with the coloured top coat, which is baked on at approx. 250  C. A protective foil is applied partially to the cooled sheet, which is then recoiled. 

Now, the finished coil is ready for delivery or further mechanical processing to be turned into slit strips, sheets or cut-to-size sheets:

Product overview

We sell coils, slit strips, sheets and sheets cut-to-size.

There is hardly a material which is used so frequently in the processing industries than steel sheet. In most cases, however, purchasing ex-works is not a possibility. As a steel service centre, we close the gap between the production in the smelter and the need of the end user through processing technology and logistical means. 

Our company manufacture, process and store flat steel products according to your needs and in numerous types and finishes. Our products can be obtained as coils, slit strips, sheets or sheets cut-to-size.

State-of-the-art systems and forward-looking product portfolio offer our customers a peace of mind regarding the delivery capacity and guarantee a constantly reliable supply with top-quality flat steel products.

Our inventory range brings colours into play.

The requirements are getting more and more individual, and the materials more diverse than ever before. Metallic surfaces and a few coil coated standard colours haven’t been able to cut the mustard for some time, unable to satisfy the wishes of the wide range of branches in the industry and construction. Our range of surfaces is just as wide as the range of branches, and our coil coating material stock comes in over 140 customary RAL colour shades – and we keep all of them in stock. Swift and straightforward delivery also plays a prominent role.