Abstract：In order to study the effect of Cr, Mn and annealing temperature on the properties of high-strength non-oriented silicon steel，the microstructure and properties of three groups of non-oriented silicon steel with different Cr,Mn content under different manufacturing processes were analyzed by means of OM,SEM,EBSD and universal tensile tester in this paper. The results show that the structure of experimental steel is not uniform after hot rolling, and the core is distributed in fibrous structure along the rolling direction, and there are a small amount of recrystalline grains at the edge. Normalized treatment can significantly improve the structure uniformity of hot rolled plate, promote recrystallization and eliminate the fibrous structure at the center of hot rolled plate. Polygonal Ferrite grains were obtained by cold rolling and annealing at 930 ℃ and 960 ℃. The grain size of the three groups of experimental steel annealed at 960 ℃ was larger, but the favorable {100} texture content decreased and the unfavorable {111} texture content increased. After annealing at 960 ℃, the iron loss of 1 # experimental steel with 0.2Mn-1Cr was the largest, P1.5/ 50 was 2.77W / kg, P1.0 / 400 was 19.39W / kg, and the magnetic induction intensity was small. After annealing at 930 ℃, the magnetic properties and strength of 2 # experimental steel of 0.5Mn-1Cr are the best: P1.5/50 is 2.41 W / kg, P1.0 / 400 is 17.36 W / kg, B5000 is 1.638 T, tensile strength is 685 MPa.
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2020, Vol. 55 
