Strip geometry has for a long time included not only width and thickness, but also profile and flatness. To meet the associated high requirements of the market, the Siemens Profile and Flatness Control (PFC) system builds on sophisticated physical models. For example, a roll temperature model analyzes and considers the asymmetrical conditions on the roll surface, while a material flow model calculates the roll pressure distribution across the length and width of the roll gap as well as the strip flatness after each stand. Based on these data, the Siemens PFC system not only makes sure that the finished strip has the desired profile or contour and the desired flatness. The flatness between stands is also taken into account in determining the optimum settings of the actuators – such as bending forces, CVC positions and/or PairCross settings.

The Siemens PFC system that was used first at the German EKO Stahl GmbH sets standards with respect to the reliable attainment of the desired strip geometry.