Modersohn supplies reinforcement systems for concrete and masonry. In outdoor areas, the concrete ribbed steel or the MOSO® perforated strip (masonry reinforcement) is usually made of stainless steel. The reason for this is that galvanised steels corrode very quickly in the alkaline environment of concrete or mortar, in combination with permanent moisture. It becomes particularly problematic if sulphide precipitation is added by bricks, e.g. in clinker facades. In this case, one does not speak of several years with permanent moisture, but of a few months at best. This can already be a humid season in which no proper drying process takes place in the wall or air layer, as investigations on the weather sides of buildings have shown. The zinc dissolves in a very short time with the formation of white rust, although the white rust does not look so dangerous at first. However, it is nevertheless no less material-destroying than the immediately conspicuous brown rust. Permanent moisture is no problem with stainless steel, even if it is a very inexpensive material grade, such as chrome steel 1.4003, which is more often used in Switzerland than ribbed steel for concrete reinforcement.
The ferritic chromium steels and duplex steels are of particular technical interest, especially for concrete reinforcement. Due to their ferritic structure (magnetically attractive), they have a significantly higher crimping effect of the surface (stronger surface roughness) in the concrete than the austenitic material types, such as 1.4401, 1.4404 or 1.4571.