Automation and Drives for Continuous Tandem Mill of Dajiang Steel in China
Siemens Expands its Leading Position
In the province of Jiangsu, around 200 kilometers west of Shanghai, Dajiang Steel is currently building a new 1250-millimeter wide cold rolling mill with an annual capacity of one million metric tons. The plant will consist of a re-built, used rolling mill bought in the U.S., and will be supplemented with equipment for continuous rolling. The mechanical components will be installed by a Chinese company. Mainly low-alloy carbon steels - also for tin plate manufacture - are to be rolled at the mill.
For the main drives of the tandem mill, Siemens will be supplying DC link converters of the type Sinamics S120 in a twin-drive configuration. The plant will be automated on the basis of the "Siroll CM" concept and - in addition to the technological controls - will also include the entire process automation system. The latter includes thickness control in accordance with the advanced mass-flow concept, online rolling-process control on the basis of analytical mathematical models and, finally, self-learning neural networks. For flatness measurement and control, the non-contact Siflat system will be used. The scope of supply also includes new operator control and visualization equipment with user-friendly process and plant diagnostic functions. In addition, Siemens will supervise assembly and installation of all the components as well as commissioning, while also bearing responsibility for customer training.
Among the main reasons why the contract was awarded to Siemens were the latter's numerous references for comparable cold rolling mills, both for new plants and modernization projects. Other reasons were the integrated technical solution based on Siroll CM and the local presence of Siemens.
Further information on solutions for steel works, rolling mills and processing lines is available at http://www.siemens.com/metals.
Siemens AG Industry Solutions Division
The Siemens Industry Sector (Erlangen, Germany) is the world's leading supplier of production, transportation and building systems. Integrated hardware and software technologies combined with comprehensive industry-specific solutions enable Siemens to enhance the productivity and efficiency of its customers in industry and infrastructure. The Sector comprises six Divisions: Building Technologies, Industry Automation, Industry Solutions, Mobility, Drive Technologies and Osram. In fiscal 2007 (ended September 30), Siemens Industry generated sales of approximately EUR40 billion (pro forma, unconsolidated) with around 209,000 employees worldwide. http://www.siemens.com/...
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