Annealing transformer steel sheet Production line and major suppliers

- Jan 28, 2019-

The production process of silicon steel is complicated. A cold-rolled silicon steel production line needs hot-rolled coils to be first mechanically dephosphorized, acid-washed and removed, and then enters the rolling mill section. The pickling roll enters the rolling mill section. Firstly, the strap is removed on the uncoiler. After unwinding, the strip head is straightened by a straightening machine and sent to the exit coiler, and the lead is wound through the jaws to be rolled. After the first pass rolling is completed, the second pass rolling is performed in reverse, and all the passes are sequentially completed according to the process requirements. Rolling by reversing mill is determined by the brittleness and structure of silicon steel. Silicon steel sheets are brittle and thin, so the roll structure of small rolls with multiple rolls is often used [3]. At present, the world's main types of cold-rolled silicon steel rolling mills are four-roll single-stand reversing mills, six-roll single-stand reversing mills and twenty-roll reversing mills. Among the four-high mills, the CVC single-stand four-roll reversing mill produced by SMS Siemag is the most typical. It relies on the support roller to transmit the torque to the work roll. Due to the passive work of the work roll, the roll diameter is small, which can achieve large pressing force and less rolling pass. It is suitable for rolling wide specifications. High magnetic permeability oriented silicon steel, but the four-roll mill consumes a lot of energy. The six-high mill has a large roll diameter, a large rolling area, a relatively small pressing force, a high rolling speed, and a silicon steel sheet with high precision requirements. The rolling pass is more, and it is easier to apply and the thickness is better. Thick silicon steel sheet, the annual output is generally 15-30 million tons of steel; and the twenty-roll mill has smaller roll diameter, smaller rolling area, larger pressing force, less rolling passes, and is more difficult to set for rolling. The ultra-thin silicon steel sheet, WISCO's silicon steel transformation purchase is a 20-roll single-stand mill. However, in each rolling process, the rolls need to undergo changes in starting, acceleration, steady speed, speed reduction, and stop. Due to the small diameter of the rolls, the rolling speed is directly caused, and the annual output is relatively low, generally at 100,000. Tons or so. All kinds of rolling mills have their advantages and disadvantages and scope of application. Now the industry is working on the use of six-roll mills and twenty-roll mills to meet the requirements of production and rolling precision [4]. After the rolling of a steel coil is completed, the finished steel coil is transported to the saddle by the unwinding trolley of the coiler, and the steel coil is weighed and bundled, then lifted by the crane to the stock after rolling, and then annealed. And painting. Since the short circuit between the core laminations is prone to increase the eddy current loss, it is generally required that the surface of the cold rolled silicon steel product be coated with an inorganic salt or a semi-organic salt insulating film to prevent unnecessary loss.