Cerium At 50W470 Efficient Application Of Non-oriented Electrical Steel

In this paper, four kinds of non-oriented electrical steels containing different rare earth Ce element were produced in the laboratory by simulated CSP (compact strip production) process smelting and the optimized heat treatment process normalizing and annealing, the effects of Ce contents in the range of0～0.018%on the inclusions in the finished products, the microstructure and the texture of hot-rolled, normalized, cold-rolled, annealed, magnetic properties of non-oriented electrical steels obtained under the same conditions have been studied.Thermodynamic analysis indicated that the Ce content in the steel caused the generated rare earth inclusions were also different.In this experiment, when the Ce content of0.0016%and0.0051%, the generated rare earth inclusions were Ce2O2S and CeAlO3, when the Ce contents of0.018%, the generated rare earth inclusions were Ce2O2S, CeAlO3and CeS, and the formation of these inclusions order Ce2O2S, CeAlO3, CeS.Ce could not only change the size and distribution of the inclusions, but also change the morphology and the type of the inclusions in the non-oriented electrical steels. The size of the inclusions could be roughened and the number of inclusions, especially the quantity of fine inclusions could be decrease by appropriate amount of Ce adding, but excessive Ce caused the number of the rare earth inclusions in steels increase in the contrary. After Ce treatment, steel inclusions with irregular shapes would spheroidize. MnS inclusions can completely be substituted by rare earth inclusions, When the added Ce reached a certain amount.Ce content also had effect on hot-rolled microstructure and texture of non-oriented electrical steels. The more Ce in steel, the higher proportion of equiaxed grains in the hot-rolled microstructure. The equiaxed grain size in the surface layer of hot rolled sheet increased with increasing Ce, coarse deformed grains in the central layer were refined at the same time. Because of affecting inclusions in non-oriented electrical steel,Ce changed the content of {225}<554> approximating the copper type texture and {110}<223> approximating the brass texture in the surface layer of hot-rolled sheet, with the increase in Ce content,{225}<554> texture content was reduced to increase, while the {110}<223> texture content firstly increased and then decreased. Ce could also affect {100}<110> and {110}<001> texture content of the central layer of the hot rolled sheet by affecting the central layer recrystallization degree of the hot-rolled sheet, the {100}<110> texture content decreased and the {110}<001> texture content increased with the Ce content increasing.Ce affect the grain size in the surface and the center layer of the normalized sheet by affecting the misorientation distribution of the hot-rolled sheet center layer and inclusions in steel, the grain size firstly increased and then decreased with increasing the Ce content.The γ fiber texture and {110}<001> texture content in the surface layer of normalized sheet trended fistly decrease and then increase with increasing Ce content,{100}<uvw> texture content firstly increased and then decreased. The {100}<uvw> texture content increased to decrease with the increase of Ce content, the {112}<110> texture {110}<001> texture content showed the contrary trend.Ce had a great impact on the grain size of normalized sheet before cold roll would cause its cold rolled texture changes. Appropriate content of Ce made the original grain size increase before cold-rolled, the y fiber texture after cold rolling would be more focused on the {111}<112> texture, then intensity of {111}<112> texture enhanced and {111}<110> texture weakened. Having original grain size after recrystallization annealing, recrystallization texture {001}<140> texture content was relatively more and {111}<112> texture content was relatively less.Ce content had effcets on the inclusions, microstructure and texture, the effcets combined worked upon the magnetic properties of non-oriented electrical steel. The less number of inclusions in the finished products, the lager grain size, the more favorable texture content, its magnetic properties could be more excellent.Ce element content in the non-oriented electrical steel had appropriate range, the content too low to obtain the best magnetic properties, the content was too high would make the magnetic properties deteriorate. Under this experimental conditions, the best Ce content in non-oriented electrical steel was0.0051%, with this Ce content, the iron loss and magnetic induction of the final products was P15/50=3.253W·kg-1and B50=1.801T, respectively. The proudut compared with50W470ordinary grades non-oriented electrical steel, the iron loss was significantly reduced and the magnetic induction was significantly improved, it was obviously able to meet the requirements of high efficiency non-oriented electrical steels.