Complex phase steels owe their name to the complex composition of their microstructure components. They have a primary bainite-ferrite microstructure in which small portions of residual austenite, martensite or pearlite can be deposited. Complex phase steels feature a high yield strength and good fatigue properties. Complex phase steels additionally have very high hole expansion ratios and consequently low edge crack sensitivity during forming. They are therefore particularly suitable for deep-drawn components with very complex geometries.