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针对鄂钢轧制的部分宽厚板表面出现结疤现象,应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察,对形成原因进行分析并提出改进措施。结果表明:疤状缺陷为块状的非金属夹杂/渣,并在钢板表面形成凹坑,其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等,其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中,通过去除钢水中夹杂物和清理铸坯等,减少非金属夹杂/渣,以提高钢板表面质量。
According to the scarring phenomenon of some heavy plate rolled by E-steel, the morphology and composition of the surface scar on Q345q hot-rolled steel sheet were observed by optical microscope, scanning electron microscope and energy spectrum analyzer, and the formation reason was analyzed improvement measures. The results show that the defects of the scars are massive non-metallic inclusions / slag and the pits are formed on the surface of the steel plate. The composition of the defects is oxide or silicate, aluminate and the like containing Si, Ti, Al, Ca and Mg, It is mainly the deoxidation products in the steelmaking process and the oxidation products of the alloys. Therefore, in the production process, by removing inclusions in molten steel and cleaning the slab, etc., to reduce non-metallic inclusions / slag, in order to improve the quality of steel surface.