The steel is also widely used electrical machinery, generators, transformers, etc. For making steel suitable for such use, its magnetic properties are given supreme importance and these properties are obtained by carefully adjusting its chemical composition. Following are the proportions of various elements in steel for making it to achieve better magnetic properties:
(1) Carbon: it is desirable to keep carbon content as low as possible and it should not exceed 0.10 per cent.
(2) Silicon: the presence of silicon results in considerable increase of electrical losses and hence it is highly undesirable.
(3) Sulphur and phosphorus: if combined content of sulphur and phosphorus exceeds about 0.30 per cent, the magnetic properties of steel are greatly affected.
(4) Manganese: if content of manganese exceeds about 0.30 per cent, it proves to be injurious to the magnetic properties of steel.