The hot strip mill for WISCO, originally delivered by SMS group in 2003, is a 2,250 millimeter mill with an annual capacity of 4.8 million tons. The mill is equipped with state-of-the-art components, including reheating furnaces, a slab sizing press capable of handling slabs 230–250 millimeters thick and 800–2,150 millimeters wide, a two-high roughing mill, a four-high roughing mill, and a seven-stand finishing mill. Final product dimensions range from 1.2–25.4 millimeters in thickness and 700–2,130 millimeters in width, making it a versatile mill capable of producing a wide variety of steel grades.
In this modernization project at WISCO in Wuhan, SMS group focused on implementing automation upgrades to optimize mill performance and meet WISCO’s objectives. Key elements of the scope included replacement and upgrade of the existing X-Pact® Profile, Contour and Flatness Control (PCFC) system. PCFC is a physical process model that calculates optimal set-points for finishing-mill actuators, such as the Continuously Variable Crown (CVC®) plus work roll bending and shifting systems. In addition to stabilizing the rolling process, PCFC significantly improves product quality, particularly in terms of strip geometry. The PCFC replacement was executed in shadow mode and completed within four weeks, meeting the guaranteed performance targets.
Additionally, the modernization encompassed the installation of new CVC® blocks in rolling stands F1–F7. The CVC® technology enables the axial shifting of rolls with a special contour, allowing continuous adjustment of the roll crown and roll gap profile. When combined with the intelligent PCFC process model, this technique enables precise control of roll bending and shifting to achieve higher profile quality. The upgrades deliver improved strip quality, greater operational stability, enhanced production efficiency and tighter product tolerances for WISCO.
These new enhancements build on a series of prior modernizations that SMS group made to HSM No. 2 between 2013 and 2024. Highlights include a 2013 revamp of downcoiler No. 3 to improve operational reliability; 2018 upgrades adding CVC® bending and shifting on finishing stands F4 and F7 and new slipper-type spindles for roughing mill R2; a new finishing-mill descaler installed in 2019 to improve surface quality; and in 2024, new work roll bending and shifting systems for stands F1–F3 and F5–F6 together with a new X-Pact® PCFC for the entire finishing mill to refine strip shape and thickness control.
The signing of the FAC confirms that all predefined targets have been met and the project is complete. This achievement underscores SMS group’s commitment to delivering advanced technologies and tailored solutions that meet the evolving needs of the steel industry. The modernization of HSM No. 2 not only enhances the mill’s capabilities but also reinforces WISCO’s position as a leading player in the global steel market.
