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SMS Siemag to Supply Electrolytic Tinning Lines to Shougang Jingtang
09/14/2011 - SMS Siemag will erect two electrolytic tinning lines for Shougang Jingtang United Iron & Steel that each will be capable of producing of 237,500 tonnes annually.
Shougang Jingtang (Shougang Jingtang United Iron & Steel), China, has contracted SMS Siemag, Germany, to erect two electrolytic tinning lines for the annual production of altogether 475,500 tonnes of high quality tinplate.
The lines will have identical equipment and each has two pay-off reels in the entry section, followed by a welder and a trimming shear as well as a vertical strip accumulator. The process section will include an electrolytic cleaning section followed by a tension leveler and electrolytic pickling section. The tin layer is then applied in a total of nine vertical coating cells. Shougang Jingtang decided in favor of installing lines with soluble anodes, in part because of the low tin consumption.
Downstream of the strip dryer will be a reflow unit, in which the coating is heated inductively to above the melting point of tin, thus providing the strip with a shiny surface and forming an alloy layer that enhances corrosion protection and adhesion of the tin layer. The reflow unit will be followed by a passivation unit with a dryer, and an exit section with another vertical strip accumulator, an inspection stand, a flying shear and two tension reels.
The two lines, which represent an annual production of 237,500 tonnes each, will be used for providing the materials T1 to T5 (single reduction) and DR7 to DR10 (double reduction) with tin coatings between 1.0 and 11.2 g/m². The width of the strips treated here may vary between 700 and 1,280 mm, and it is possible to process strip gages of 0.12 to 0.55 mm. The strip speed in the process section can reach a maximum of 600 meters/minute and, in the entry and exit sections, up to 750 meters/minute.
Material processed in the two electrolytic tinning lines will be supplied from a continuous tinplate annealing line with a reduction and skinpass mill and an offline reduction and skinpass mill. Shougang Jingtang placed the order for the supply of these facilities with SMS Siemag at the beginning of 2011.
The two new electrolytic tinning lines are to be put into operation at the end of 2013 on Caofedian Island, an artificially constructed island off the coast of the Chinese province of Hebei.
SMS Siemag AG is a company of the SMS group, which is, under SMS Holding GmbH, a group of companies internationally active in plant construction and mechanical engineering for the steel and nonferrous metals industry. It comprises the two Business Areas SMS Siemag and SMS Meer. In 2010, some 9,200 employees worldwide generated a turnover of EUR 3 bn.
