Zhejiang Concord 1,450mm Cold Mill Achieves Mass Production of Thin Strips

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Zhejiang Concord 1,450mm Cold Mill Achieves Mass Production of Thin Strips

2013-06-25 10:15:15

April 3, 2013 witnessed the success of producing thin strips at high speed with heavy reduction by 1,450 mm 5-stand cold mills supplied by CISDI for Zhejiang Concord Shouxin Steel Co., Ltd. The line produced strip with min. thickness of 0.25mm using 2.5mm thick feedstock (grade Q195 and strip width 1200mm), featuring maximum reduction of 90%, rolling speed of 1,000 m/min, product thickness accuracy of ± 2μm. The thickness over-tolerance during speed changing is less than 2%, and the sheet/coil shape and surface quality are good.

As the metal will get hardened during plastic deformation, the straight carbon steel will have a limit on the strain. Ultra-high reduction rolling technology allows rolling with near-to-limit strain, so it is possible to produce the same-thin gauges with even thicker feedstock, or produce thinner sheets with same feedstock. In this way, the feedstock for the cold mill can be more flexible and the procurement cost will be lower.

To ensure the product thickness control accuracy and final shape, the ultra-high reduction rolling is very demanding with aspect to mechanical equipment, process models, automation control and operation skills, so it has always been a challenge in straight carbon steel cold rolling sector. The success of Zhejiang Concord 5-stand tandem cold mill in mass production of thin strips with ultra-high reduction marks CISDI’s breakthrough in cold rolling equipment integration, process and control.

The 5-stand tandem cold mill is successfully implemented with CISDI’s proprietary L2 models for cold rolling, high-precision thickness control technology and cold-rolled strip shape control technology.