罩式退火炉底部加热电阻带熔断原因浅析  

Cause analysis of the fusing of the resistance belt at the bottomheating of the bell-type annealing furnace

作　　者：郑韩超 郝晓鹏 肖辉明 王旭 王磊 杨学强 ZHENG Hanchao;HAO Xiaopeng;XIAO Huiming;WANG Xu;WANG Lei;YANG Xueqiang(Shougang Zhixin Qian an Electromagnetic Materials Co.,Ltd.,Qian an 064400,China)

机构地区：[1]首钢智新迁安电磁材料有限公司,河北迁安064400

出　　处：《电工钢》2023年第6期43-47,共5页ELECTRICAL STEEL

摘　　要：高温罩式退火炉是取向硅钢生产过程中极其重要的一环。投产初期,底部加热电阻带出现熔断现象,导致底部加热系统无法正常使用,高温罩式炉未正常投入底部加热系统,生产的取向硅钢明显发现存在点状漏晶、头尾铁损偏大等质量缺陷,影响钢卷磁性能。本文通过对电阻带熔断部位及熔融物进行物理、化学分析,并通过金相检测、电镜扫描、化学成分检测等方式,检测出耐火砖中存在磷化物,导致其在高温阶段与电阻带发生电腐蚀反应,造成电阻带断开。High temperature bell-type annealing furnace is an extremely important part of the production process of grain-oriented silicon steel.In the early stage of production,the bottom heating resistance belt was fused,which led to the failure of the bottom heating system to operate normally.When the high temperature bell-type furnace was not normally put into the bottom heating system to produce grain-oriented silicon steel,it was found that there were some quality defects such as spot-like crystal leakage and large iron loss at the head and tail,which affected the magnetic properties of steel coils.In this paper,through physical and chemical analysis of the fuse site and melt of the resistance belt,and through metallographic detection,electron microscope scanning,chemical composition detection,the content of P in the refractory brick was found exceeding the standard,which led to the electric corrosion reaction with the resistance belt at high temperature stage,resulting in the resistance belt disconnection.

关 键 词：罩式退火炉 电阻带 底部加热 熔断 

分 类 号：TG155.1[金属学及工艺—热处理]