Abstract: The middle and small electric machine rotors were studied in the condition of traditional steel-making technique in Chengdu Steel Corporation, which had no refining and electromagnetic stirring equipments. Following the reasonable technique of steelmaking, continuous casting and hot rolling, as well as the strict control of the parameters of every procedure, the low silicon content cold-rolled hot strip of the dynamo steel was produced and reached the related national standard. The results show that the product of the dynamo steel reaches the international standard of 50W1300. There are no interior and exterior defects on the billet steel and the cold-rolled and hot-rolled strips are better on the surface, which is fit for the producing of small electric machine rotors.