Effect Of Normalizing Temperature On Microstructure And Texture Evolution Regularity Of Non-oriented Electrical Steel

With the development of national economy, china，as one of the main bodies inthe third economy, develops rapidly in electric power, airline and aerospace. Demandsof silicon steel and its properties are increasing quickly nowadays, too. The producinglevel of silicon steel is a symbol of iron and steel inderstry in a country. The producingprocess of silicon steel must include high purity steelmaking technology, high precisiontechnology of controlled rolling and controlled cooling and accurate annealingtechnology, which paly a very important role in detemining the properties of endproduct. Influence of hot rolling plate on properties of end product is mainly studied inthis paper. The ways to inprove microstructure of hot rolling plate mainly includecontrolled rolling and controlled cooling technology and normalization. Normalizationof hot rolling plate has bigger effect on texture of end product. Normalizing technologyof high-grade of no orientation silicon steel has been very common and wridly used inour country, but the application and study on low-grade of no orientation silicon steel israrly seen. The low-grade of no orientation silicon steel was taken as an object of study,and the influences of normalizing temperature on microstructure and texture evolvtionof no orientation silicon steel were also studied.This paper took50W600no orientation silicon steel as study object，and threedifferent cold rolling base materials were obtained by annealing at850℃,950℃andraw material. After that, three different cold and hard boards were got by the same coldrolling technology. Continuous annealing and batch annealing were taken in order tofind the best technology to produce no orientation silicon steel，and then suppliedcertain data for production site.The results show that: TiC, Ti（C，N）and a few spherical MnS, TiN and Cu2Sprecipitates after adjusting the microstructure, and the size of the precipitations aregetting lager with the increasing temperature.The grains in the cold rollingmicrostructure of the original hot rolling plate are uniform and slender fibrous, moreshear zones and deformation zones appears after adjusting the microstructure and thetwo zones even more near the surface.The density of {100}<011> and {112}<110>textures increases more obviously in cold rolling textures, the texture density of theoriginal hot rolling plate is the strongest and reaches16, the texture density of the basematerials that annealing at950℃is the second and reaches13.The recrystallization textures of the original hot rolling plate in continuous annealing are mainly{100}<011>,{110}〈011〉 and {111}〈112〉textures, while the recrystallizationtextures of the adjusting cold rolling plate are mainly {100}<011>,{110}〈011〉 andstronger gauss textures.The recrystallization textures of the original hot rolling platethermal insulated for2hours in batch annealing are mainly {100}<011>,{110}〈011〉and {111}〈112〉textures and the density reaches6, while the recrystallization texturesof the adjusting cold rolling plate are not change basically. The densities of γ texturesare increasing and {100} textures are decreasing with the extension of thermalinsulation time.