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以1.26%Si无取向硅钢为对象,进行了退火工艺试验研究。采用金相组织和晶粒分析等手段,研究了退火工艺参数对无取向硅钢组织性能的影响规律。结果表明:在退火温度低于750℃时,钢的强度随退火温度的升高和退火时间的延长而缓慢降低,而伸长率增加较快;当在750℃以上退火时,随着退火温度的升高,钢的抗拉强度急剧下降,而伸长率趋于稳定;在600~750℃退火时,晶粒尺寸长大较为缓慢,纵向和横向的晶粒尺寸相差不大,并较为均匀;当退火温度在800~850℃时,部分晶粒开始异常长大;在750℃退火时间60、180、300 s时,尺寸晶粒分别为37.25、38.09、39.10μm。本研究结果可为设计和生产1.26%Si高品质无取向钢提供理论和技术支撑。
Aiming at 1.26% Si non-oriented silicon steel, the annealing process was studied. The influence of annealing process parameters on the microstructure and properties of non-oriented silicon steel was studied by means of microstructure and grain analysis. The results show that when the annealing temperature is lower than 750 ℃, the strength of the steel decreases slowly with the increase of annealing temperature and annealing time, but the elongation increases rapidly. When the annealing temperature is above 750 ℃, with the annealing temperature , The tensile strength of steels decreased sharply and the elongation tended to be stable. When annealed at 600-750 ℃, the grain size grew more slowly and the grain sizes in the longitudinal and transverse directions were similar and more uniform Part of the grains begin to grow abnormally when the annealing temperature is between 800 and 850 ℃, and the sizes of the grains are respectively 37.25, 38.09 and 39.10 μm at 750, 180 and 300 s. The results of this study can provide theoretical and technical support for the design and production of high quality non-oriented steels of 1.26% Si.