Olsberg produces cast iron with lamellar graphite according to DIN EN 1561 and cast iron with nodular graphite according to DIN EN 1563.
The following materials are manufactured:
|Material according to DIN EN 1561
|Material according to DIN EN 1691 (old designations)
The Königshütte plant produces only EN-GJL-150 and EN-GJL-200 materials.
In Germany, the share of gray iron in total foundry production has remained relatively constant at around 60 percent for years. The majority of this goes to the automotive and mechanical engineering sectors. This may come as a surprise to some: The material has not only proven itself millions of times over under some of the toughest operating conditions, but also stands for filigree design and weight savings.
Common gray iron castings include electric motor rib housings, gearbox housings, compressor and pump housings, valves and fittings, and furnace parts. In these areas of application, the material is practically non-substitutable in terms of both material properties and economy. On the contrary, gray cast iron is a "modern classic". State-of-the-art molding, casting and machining processes contribute to its preference in many applications over other materials such as cast steel, malleable cast iron or cast aluminum, not least for cost reasons.
Convincing alternatives not in sight?
Take aluminum, for example: This material has a significantly lower density, which is expected to offer weight advantages in various areas of application. However, the tensile strength of aluminum is much lower than that of cast iron. To achieve the same stability, aluminum parts must therefore be dimensioned more voluminously than a comparable gray cast iron part, which reduces the actual weight advantage. Since aluminum cannot be subjected to such high mechanical stresses, steel bearing bushes, for example, have to be pressed in, which leads to a further increase in weight.
Winner in cutthroat competitionv
In contrast, gray cast iron can be used to cast much more filigree, extremely resilient parts, which also has functional advantages in many areas of application. In other words, "lightweight construction" is also possible with gray cast iron - not as a result of low density, but due to optimized, load-optimized designs. It also has a significantly better energy and waste balance in the manufacturing process. Gray cast iron, for example, is fully recyclable. In the pump and electric motor sectors, but also in other industries, there is currently even a return to gray cast iron as a material with higher load-bearing capacity, which is technically less problematic and more economical.