Abstract: A cold rolled pole sheet steel with high strength, high magnetic induction intensity and high dimensional accuracy was developed in this paper. In order to find the proper components and technologies of the cold rolled pole sheet steel, the microstructures, mechanical properties and magnetic properties of the test steels with different components were analyzed. The results showed that the 550 MPa pole sheet steel with the component of C  0.69 %,Si 0.42 %,Mn 1.25 %,P≤0.010 %,S≤0.005 %,Als 0.033 %,Ti 0.088 % and Nb 0.039 % will get the best properties by proper technologies. The microstructure of the steel is ferrite and free cementite with the grain size of grade 12, and the yield strength is more than 550 MPa, and the elongation reaches above 10 %, and the magnetic properties are also excellent with the magnetic induction intensity B50 above 1.50 T.

Key words: pole sheet steel, magnetic induction intensity, annealing