Recent Progress on Non-oriented Silicon Steel

Control of crystalline orientation and consequent enhancement of magnetic properties are important for decreasing core loss of non-oriented silicon steel as well as grain-oriented silicon steel. Through the development of special process techniques to produce clean refined steel, it is now possible to use any element to improve the crystalline texture control of steel without producing harmful effects. Utilization of these effects have actually lowered the core loss and raised the magnetic flux density of the products, and a product series of high-efficiency non-oriented silicon steel has been developed. Recently, demand has grown for non-oriented silicon steel with particular properties, such as lower core loss at high frequencies or high strength, as high-speed motors have progressed in regard to high efficiency and miniaturization. In response to this trend, non-oriented thin gauge silicon steel with a thickness of 0.20 and 0.15mm and high strength non-oriented thin gauge silicon steel with the same thickness but a yield strength of more than 570MPa and 780MPa have been developed.