连续热镀锌钢板表面露铁原因分析及改进措施

Analysis on Causes Leading to Uncoated Dots on Surface of Continuous Hot Dip Galvanized Steel Sheets and Improvement Measures

镀锌钢板表面出现连续的氧化现象,镀锌后锌层出现局部脱落,严重影响产品质量与机组生产,对炉区工艺设备排查调整,发现炉区5号高温计轻微泄漏及炉鼻子露点控制不合理,导致炉区露点异常,带钢表面出现氧化,通过修正炉区关键工艺设备点检周期,规范炉鼻子露点管理等措施,彻底解决炉区氧化问题,以及带钢表面局部脱锌问题。

Continuous oxidation phenomenon appeared on the surface of galvanized steel sheets and the zinc coating partially peeled off after galvanizing, all of which had a serious impact on the quality of galvanized steel products and production by galvanizing unit. After the investigation and adjustment of the equipment in the furnace area, it was found that the slight leakage of No. 5 pyrometer in the furnace area and unreasonable control of the dew point by the furnace nose caused the abnormality in dew point in the furnace area and oxidation on the surface of steel strips. By taking measures such as revising the inspection period for key equipment in the furnace area and standardizing the management on dew point by the furnace nose, the troubles of oxidation in the furnace area and the partial zinc flaking on the surface of steel strips were completely shot.