Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling

Cold-rolled silicon steel strip products are widely used as the main soft magnetic components in cores of electrical motors, generators, and transformers. In case rotating machines, so-called non-oriented electro-technical steels normally applied. They characterized by a similar behaviour to induced field found all sheet plane directions. The kind alloys that defined herein not only possess an isotropy electromagnetic properties, but also high mechanical strength; such called high-strength (HSET) steels. These commercially produced HSET contain content range 3–4 wt.%. However, if exceeds 3%, machinability Fe–Si is dramatically reduced they become much more brittle consequence. According this, regular hot band damage occurs during cold deformation at high-speed tandem rolling mill. accordance with these reasons, production thin grades using traditional methods extremely problematic it characterised degree damage. this scientific work, effect preheating hot-rolled strips on their workability improvement was investigated. results study indicate bands elevated temperatures increases resistance failure plasticity. Moreover, mathematical simulation clearly demonstrates residual stress distributed relatively homogeneously across thickness samples, which were rolled 100 °C contrast same ones deformed room temperature.