Since the turbo manifolds used by Scania must withstand hard conditions with high temperatures, corrosion and loading the mechanical properties are of utmost importance. These properties are related to the microstructure of the material. The steel microstructure shown above is studied in detail with electron microscopy because of its carbides and we aim to understand if cracks follow the path of the carbides or another path. This is a way to detect the weakness of a material and understand how it can be made stronger. The picture shows the grain boundaries of the material where the carbides often are found.