Why is Silicon Steel used in Generators and Transformers?

Silicon Steel is preferred over other steels to be used in transformers and generators because it improves the ability of magnetic fields to penetrate it, and reduces the hysteresis losses present in the steel. It can also reduce the rate of Corrosion but the Primary factor to Add Silicon to Steel is to reduce the Hysteresis Losses.

Silicon + Steel = Reduction of Hysteresis Losses.