Chinese aluminium producer Tianjin Zhongwang Aluminium Co. Ltd. operates two high-capacity aluminium hot rolling lines supplied by SMS group in Tianjin, near Beijing. One of the two lines in 1 + 1 + 3 configuration, so far comprising two reversing roughing stands and a three-stand finishing mill, received a further finishing stand by SMS group in early 20108 and was thus be expanded to a 1 + 1 + 4 plant configuration. After the shutdown period of only 23 days, the first coil was successfully rolled ahead of schedule.
Being in position one of the finishing train, the new, high-performance stand accomplishes the major part the forming work. As like the three existing stands, the new stand F1 is of 4-high design and features latest automation and control systems, such as CVC®plus (Continuously Variable Crown), roll shifting technology, a rolling technology package specifically designed for aluminium hot rolling and the X-Pact® electrical and automation systems by SMS group. The technology package includes a wide range of technological features such as hydraulic actuation systems and cooling, lubrication, measuring and cleaning systems designed to achieve the required mechanical properties and an excellent strip surface quality.
Along with the installation of the additional finishing stand, SMS group modified related plant equipment to make is suitable for the new and higher product quality requirements for the increased line capacity. Especially for low-temperature rolling, a newly developed blow-off and suction system has been installed in the exit section of the finishing mill. The mill in its present stage of expansion provides the line the high flexibility needed to roll the complete range of aluminium hot strip grades in widths up to 2,900 millimeters and thicknesses between 2.2 and 12 millimeters.
Tianjin Zhongwang Aluminium was very happy about the fact that the high-capacity hot rolling line could resume regular three-shift production only three days after commissioning.