为解决中厚板生产过程中出现的表面氧化铁皮压入问题,利用扫描电镜和能谱仪对钢板除鳞过程中产生的氧化铁皮及成品钢板表面氧化铁皮缺陷进行对比分析。分析了产生氧化铁皮缺陷的钢种、厚度区间、分布位置特点,找出了氧化铁皮缺陷产生的原因。采用规范高压除鳞水,将钢板终轧温度由920℃降低至860℃,返红温度由750℃降低至700℃,在轧机和矫直机前安装气吹装置等一系列改进措施后,钢板表面氧化铁皮缺陷发生率由0.2%降低至0.05%,极大地提高了中厚板的表面质量。
In order to solve the problem of scale formed on plate surface in the process of plate rolling,the scale defect occurring in the course of descaling and formed on the surface of the finished plate were analyzed by means of SEM and EDS.The steel grades,the range of thickness and the distribution positions to form scale were analyzed and the causes of scale formation were found out.By regulating the time of high pressure water descaling,reducing the finishing temperature and re-reddening temperature and fixing the blow installation in front of the rolling mill and straightening machine,the scale on the plate surface was greatly reduced and the surface quality of the plate was obviously improved.
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