PROCESS EQUIPMENT UPDATE
The biggest vertical shot blast machine ever built by Rösler goes to China
tainless steel is one of the most important raw materials for many industries, such as medical engineering, ship building, aerospace,
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etc. Accordingly, high volumes of stainless steel are used all over the world. To cope with the increasing demand, TISCO, one of the largest manufacturers of stainless steel, modernised the production line in its hot rolling mill for stainless steel plates. As partner in this challenging project, Rösler built the biggest vertical shot blast machine in the company’s history. As part of the China Baowu Steel Group Corporation Limited the Taiyuan Iron and Steel Group Co., in short TISCO, is one of the largest and most renowned suppliers
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of steel in the world. For a long time the company, located in Taiyuan in the Chinese province Shanxi, has specialised in, among other industrial goods, the development and production of stainless steel products such as plates and sheets. Since 2020 a huge modernisation project has been underway for this business division with the goal to update the production line in the hot rolling mill for stainless steel plates with state-of- the-art equipment, including a new shot blast and pickling system. Once the project is completed, the entire line will run fully automatically. Te technical specifications for the shot blast system, processing steel plates up to 4,100mm long, 160mm thick and with a maximum weight of 35 tons,
were very detailed and strict; particularly with regard to the shot blasting results and the workpiece handling. Te challenge for the Rösler engineers was to design and build a machine that guarantees a high-quality, high-precision finish in the micrometre range and high throughput. With regard to size and production speed the new shot blast system dwarfs the equipment that the company has ever built in this field.
HIGH FEED RATE AND LOW SURFACE ROUGHNESS READINGS Some of the TISCO requirements were that the steel plates must pass through the shot blast machine at a speed of 7m/ min, the surface roughness cannot exceed Ra = 4.0µm, and the surface finish must correspond to A/B Sa 2.5. To prevent even minimal damage on the workpiece surface by the transport rollers, the customer demanded the plates to be transported through the shot blast machine and the subsequent pickling system in vertical position. A challenge was that the plates are delivered horizontally and must be changed
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