At the Shanghai works of Chinese steel producer Baoshan Iron & Steel Co Ltd. (Baosteel), a newly-built double cold reduction (DCR) mill supplied by Primetals Technologies commenced operation. The DCR mill is designed to process 205,000 metric tons of cold strip per year and is part of Baosteel´s Tinplate Product Structure Optimization Project. It may be run in both reduction/temper and temper mode. The processed strip will be used for the production of beverage can, metal caps, electrical components, for example. Primetals Technologies had received the order in December 2016.
Baoshan Iron & Steel Co Ltd. is part of the newly formed China Baowu Steel Group Corp Ltd, with an annual production of approximately 65.4 million metric tons (2017) the second largest steel producer in the world. Baosteel produces high-quality products for both the domestic and the world markets.
The DCR mill supplied by Primetals Technologies has an annual production capacity of 205,000 metric tons at a maximum line speed of 1,500 m/min. It consists of a two-stand UCM and is designed to perform double-cold reduction as well as one-stand temper rolling.
In the DCR process, the annealed strip, after reduction in a tandem cold mill, is reduce rolled on the No. 1 stand and temper rolled on the No. 2 stand. This process imparts the strip with its prescribed mechanical strength. In stand No. 1, work rolls with two different diameters can be used.In one-stand temper rolling, the strip is temper rolled in stand 2 to the prescribed elongation ratios to obtain the desired mechanical characteristics.
The DCR mill processes strip produced by a PLTCM. Entry strip gauges are between 0.17 mm and 0.55 mm. Exit gauges range from 0.12 mm to 0.36 mm. Strip width may vary from 700 to 1,230 mm. At a coil diameter of 2,000 mm, maximum coil weight amounts to 24.15 tons. Steel grades include DR7 to DR10.
Source: Primetals Technologies