Trial production of Fe-6.5%Si steel ultra-thin strip
ZENG Chun1, CHENG Zhao-yang2, WANG Xiang-long3, WU Zhang-han4
1. College of Mechatronics and Vehicle Engineering, Weifang University, Weifang 261061, Shandong, China; 2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China; 4. National Engineering Research Center for Silicon Steel, Wuhan Iron and Steel Co., Ltd., Wuhan 430080, Hubei, China
Abstract：In order to study preparation process of Fe-6.5%Si steel ultra-thin strip,and gain good magnetic properties,using 6.5%Si steel cast strip manufactured by strip casting machine as raw material,then be rolled through single warm rolling,double warm rolling and room temperature cold rolling based on the theory of deformation induced disordering(DID) to prepare 0.1 mm thickness Fe-6.5%Si steel. The analysis results show that texture of annealed sheet produced by single warm rolling is mainly composed of γ type with high strength,warm reduction achieved 90%,thus result in high deformation energy,so the annealed sheet has the biggest recrystallization grain size,the lowest iron loss and the lowest magnetic flux density among three processes. Texture of the annealed sheet produced by double warm rolling composed of γ type and η type with high strength,which result in higher magnetic flux density than that of single warm rolling. The 6.5%Si steel thin strip produced by double warm rolling has the best comprehensive magnetic properties,this process,on the other hand,with high production costs and low efficiency; On the base of theory of DID,6.5%Si steel hot-rolled sheet′s warm rolling is carried out at 300-450 ℃ and 45%-65% reduction,thus 6.5%Si steel be softened and then be cold rolled at room temperature to 0.1 mm thickness,ordered phase disappeared in warm-rolled sheet and cold-rolled sheet,the matrix is changed into disordered phase. The annealed sheet produced by room temperature cold rolling has smaller recrystallization grain size and little higher iron loss. Since cold rolling promotes {111}<112> deformed grain nucleation at cold-rolled shear band to come into being favorable texture,so magnetic flux density been greater enhanced. On the base of theory of DID,cold rolling at room temperature has high production efficiency,further lower iron loss shall be gained after annealing process optimization,this process provides technical reference for strip casting mass-produce 6.5%Si steel ultra-thin strip with good magnetic properties.
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2022, Vol. 57 
