The effects of size

type

amount and morphology of inclusions in steel on magnetic properties of non-orien- ted silicon steel is reviewed. The main kinds of inclusions in non-oriented silicon steel are smaller size MnS

AIN

and CuxS etc. The inclusions of dimension 0. 1 ~ 1. 0μm have larger influence on magnetic properties of steel and with increasing the number of inclusions in steel

their negative influence on magnetic properties of silicon steel increases. Almost all of the minor inclusions in non-oriented silicon steel could be removed by calcium and RE treatment to form larger size RE and calcium oxysulphide inclusions. In commercial production a first priority is to improve the size of inclusions

avoid formation of the inclusions with size range of 0. 1 ~ 1. 0μm and based on metallurgy equipment

refining method and casting process to select high purity or harmless process flow sheet for controlling the inclusions in steel.