Gerdau Açominas, Brazil, invests in new plate and Steckel mills
Gerdau Açominas, a company in the Gerdau Group, has ordered a plate mill and a Steckel mill. The two rolling mills will be constructed at Ouro Branco in
the state of Minas Gerais, Brazil. A second strand will also be added to their existing continuous slab caster that initiated its production one year ago.
The two new rolling lines are part of an investment program for the Ouro Branco Steel Works, which is intended to launch Gerdau Group as a flat carbon steel producer in Brazil. The end products include not only high grade plates for API (American Petroleum Institute) linepipes, but also for shipbuilding, the construction industry and pressure vessels. Under the investment program, Siemens VAI has already supplied a single-strand continuous slab caster, with a capacity of 1.5 million tonnes per annum, which was put into operation in May 2009. As part of the current order, a second strand with the same capacity is to be added to this casting machine.
The scope of supply also covers all the mechanical, electrical and automation equipment for the two rolling lines. The plate rolling line consists of a single-stand plate rolling mill, a pre-leveler, an intensive cooling section and a hot plate leveler. Downstream there are cooling beds, a double side trim shear and a dividing shear, a cold plate leveler and the thick plate cutting area.
An ultrasonic testing station is provided for quality assurance. The heavy-plate line will produce plates with thicknesses between 4.5 and 150 millimeters, widths between 900 and 3,600 millimeters, and lengths between 3 and 18 meters.
For the Steckel mill, Siemens is supplying the Steckel rolling stand with coiler furnaces, a crop shear, a laminar flow cooling section, and the downcoiler with its associated coil handling devices. The rolling line is designed producing steel strip ranging in width from 900 to 2,100 millimeters and in thicknesses between 2 and 20 millimeters. The scope of supply is completed by fluids systems and the water treatment plants for the two rolling lines.
The solution for the two rolling lines is based on the integrated Siroll PM concept for plate and Steckel mills. The main drives of both rolling mills are to be equipped with non-salient pole synchronous motors powered by voltage source converters. The scope of supply also covers the complete instrumentation, the measuring system and the automation, and includes all the technological control systems and process models. A microstructure monitor will also be used in the plate rolling mill, making it possible to determine the mechanical properties of the heavy plate reliably in advance.
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