Abstract：In order to meet the mechanical requirements of silicon steel for high-speed motor rotors,ultra-high strength non-oriented silicon steel was developed in the laboratory,with a view to providing some reference for large-scale production. Two technological routes,one-time cold rolling and two-time cold rolling,are adopted to make the annealed plate of the test steel with the alloy composition of 3%Si-0.8%Al retain the non-recrystallized structure. That is,the dislocation strengthening method is used to develop the ultra-high strength non oriented silicon steel. The magnetic polarization J5 000 of 500 MPa and 600 MPa grade ultra-high strength non-oriented silicon steel developed by one-time cold rolling method can reach 1.66 T and 1.61 T respectively. And when the annealing process is 675 ℃-4 min,the recrystallization fraction of the product is 81.2%,and the yield strength Rp0.2 is 542 MPa;when the annealing process is 650 ℃-2 min,the recrystallization fraction is 30.3% and Rp0.2 is 656 MPa. The 600 MPa grade ultra-high strength non-oriented silicon steel developed by two-time cold rolling method has a recrystallization fraction of 30.7% and Rp0.2 of 642 MPa under the annealing process of 650 ℃-2 min;J5 000 is about 0.04 T higher than that of 600 MPa grade one-time cold rolled products,reaching 1.65 T;The comprehensive performance level of the product is equivalent to that of Nippon Steel's 35HXT590T. The initial recrystallization temperature of the test steel is about 625 ℃. When the annealing process is 700 ℃-4 min,the recrystallization of product structure is complete. With the increase of annealing temperature and annealing time,the recrystallization fraction of the product gradually increases,the mechanical strength and iron loss of the product monotonously decrease,and the magnetic polarization intensity monotonously increases. The annealing temperature is from 525 ℃ to 725 ℃,the magnetic polarization intensity J1 500 of the product is increased by 0.331 T,and the J5 000 is increased by 0.143 T,that is,the low field magnetic polarization intensity is increased more. The recrystallization fraction of products varies greatly with different annealing processes,which has a great impact on the properties. Therefore,it is necessary to control the annealing temperature and time more accurately in order to ensure the stability of the product structure and properties.
潘振东, 吴昆, 赵向东, 林媛, 张文康. 位错强化开发超高强度无取向硅钢[J]. 钢铁, 2023, 58(3): 111-118.
PAN Zhen-dong, WU Kun, ZHAO Xiang-dong, LIN Yuan, ZHANG Wen-kang. Development of ultra high strength non-oriented silicon steel by dislocation strengthening[J]. Iron and Steel, 2023, 58(3): 111-118.
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2023, Vol. 58 
