在工业生产条件下,对比分析了不同热轧终轧温度对中低牌号无取向硅钢组织和磁性能影响。结果表明:当热轧终轧温度为890℃时,热轧带钢表层为铁素体再结晶组织,芯部为铁素体相变组织;带钢经冷轧退火后,成品晶粒细小,铁损为5.565 W/kg,磁感为1.744 T,磁性能较差;当终轧温度为870℃时,热轧带钢全为粗大的铁素体再结晶组织,带钢经冷轧退火后,成品晶粒粗大,铁损降低至5.329 W/kg,磁感升高至1.762 T,磁性能最佳;当终轧温度降低至850℃时,带钢在热轧时再结晶晶粒难以长大,经冷轧退火后,铁损为5.507 W/kg,磁感为1.760 T,磁性能介于890℃和870℃之间。此外,实际工业生产数据表明,当热轧终轧温度为850~875℃时,成品磁性能明显优于880~900℃。
The effect of finishing temperature on microstructure and magnetic properties of medium and low grade non-oriented silicon steel was studied under industrial production conditions. The results show that when the finishing temperature is 890 ℃,the surface layer of the hot rolled strip is recrystallization ferrite structure and the core is phase transformation ferrite structure. After cold rolling and annealing,the grain size of the finished strip is fine,the iron loss is 5. 565 W/kg,the magnetic induction is 1. 744 T,and the magnetic properties are poor. When the finishing temperature is 870 ℃,the hot rolled strip is coarse recrystallization ferrite structure. After cold rolling and annealing,the grain size of the finished strip is coarse,the iron loss is reduced to 5. 329 W/kg,the magnetic induction increases to 1. 762 T,and the magnetic properties of the hot rolled strip are the best. When the finishing temperature is reduced to850 ℃,it is difficult for the recrystallized grain of the strip to grow during hot rolling. After cold rolling and annealing,the iron loss is5. 507 W/kg,the magnetic induction is 1. 760 T,and the magnetic properties are between 890 ℃ and 870 ℃. In addition,the actual industrial production data show that when the finishing temperature is 850-875 ℃,the magnetic properties of the finished product are obviously better than those of 880-900 ℃.
Transactions of Materials and Heat Treatment
non-oriented silicon steel