常化炉温度波动对无取向电工钢50W310G性能影响  

Impact of temperature fluctuations in the normalization furnace on the properties of non-0riented electrical steel 50W310G

作　　者：叶铁[1] 高振宇 陈春梅 卢志文[1] 仲志国[1] 马春华[1] YE Tie;GAO Zhenyu;CHEN Chunmei;LU Zhiwen;ZHONG Zhiguo;MA Chunhua(Intelligent Manufacturing Research Institute,Nanyang Normal University,Nanyang 473061,Henan,China;Technology Centre of Ansteel Co.,Ltd.,Anshan 114009,Liaoning,China)

机构地区：[1]南阳师范学院智能制造研究院,河南南阳473061 [2]鞍钢钢铁集团研究院,辽宁鞍山114009

出　　处：《金属功能材料》2023年第4期41-48,共8页Metallic Functional Materials

基　　金：河南省自科基金项目(182300410240);河南省教育厅项目(212300410377)。

摘　　要：在生产高效无取向专用电工钢50W310G时,常化炉均热段出现供电异常波动事故,导致均热段炉温从920℃波动960℃而后又降低至800℃并停产。为了弄清本次事故对电工钢组织、织构和磁性能造成的影响,将事故卷在相应的温度区间进行在线(不切断)取样。利用万能拉伸机、金相显微镜、扫描电镜、X射线织构测试仪和磁性能测量等技术手段,研究和分析冷轧无取向电工钢事故钢的卷微观组织、织构和电磁性能。研究发现事故钢卷随温度的降低,屈服强度和抗拉强度呈现增大趋势;晶粒随着温度的降低再结晶效果越来越差,温度840~800℃时出现“混晶”组织;AlN夹杂呈现较大的方块状,但Al和N的元素占比变化较小。事故卷中,随温度的降低,磁性有利的(100)<001>、(110)<001>位向组分增加,不利的(111)<110>组分减弱,这种反常的变化与炉内的张力波动有关。磁性能变化最终体现在随温度的降低铁损增高,磁感降低。通过以上研究可知:对常化炉均热段供电事故产生的事故卷处理的最好方式是采取二次常化或者继续生产根据实际电磁性能进行降级(降低牌号)改判处理,从而减少废品产生,降低事故增碳。During the production of 50W310G,a highly efficient non-oriented electrical steel,a power supply abnormal fluctuation accident occurred in the annealing furnace's homogenization section,causing the furnace temperature to fluctuate from 920℃to 960℃and then drop to 800℃,resulting in production stoppage.To investigate the effect of the accident on the microstructure,texture,and electromagnetic properties of the electrical steel,samples were taken online(without interruption)in the corresponding temperature range.Using techniques such as universal tensile testing machine,metallographic microscope,scanning electron microscope,X-ray texture testing instrument,and magnetic property measurement,the microstructure,texture,and electromagnetic properties of the cold-rolled non-oriented electrical steel after the accident were studied and analyzed.It was found that with the decrease in temperature,the yield strength and tensile strength of the accident steel coil increased.The recrystallization effect of the grains became worse with the decrease in temperature,and a"mixed crystal"structure appeared at a temperature of 840-800℃.The AIN inclusions showed larger square shapes,but the elemental ratios of Al and N changed slightly.The(100)<001>and(110)<001>orientation components,which were beneficial to the magnetic properties,increased,while the(111)<110>component,which was harmful to the magnetic properties,weakened as the temperature decreased.This abnormal change was related to the tension fluctuation in the furnace.The change in magnetic properties was finally reflected in the increase of iron loss and the decrease of magnetic induction with the decrease in temperature.Based on the above research,the best way to deal with the accident coil caused by the power supply abnormal fluctuation in the annealing furnace's homogenization section is to adopt secondary normalization or continue production with downgrading based on the actual electromagnetic properties.This approach can reduce waste production and lower the accid

关 键 词：无取向电工钢 组织 织构 磁性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]