Analysis on Appearance and Cause of Scale Defects on the Steel Plate Surface
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摘要: 通过扫描电镜、能谱仪和XRD衍射仪等相关试验手段对带钢表面氧化铁皮缺陷外貌形态、微区成分进行了试验分析,并对氧化铁皮缺陷产生的原因进行了研究。结果表明带钢的氧化铁皮缺陷主要有四种:①板坯出炉后未被高压水除鳞箱清除干净的粗轧时产生的一次氧化铁皮缺陷;②精轧前未完全被高压水除鳞而残存的二次氧化铁皮压入缺陷;③精轧过程中及随后的冷却过程中辊面氧化膜磨损造成热轧钢卷表面形成的三次氧化皮;④红色氧化铁皮的产生,主要是由于钢坯加热过程中表面氧化物与基体金属产生强烈啮合所致,大部分发生在高硅含量等特定的钢种上。Abstract: The appearance,microstructures and compositions of iron oxide scale on the strip steel surface were studied by means of SEM,EDS and XRD,and the causes of scale defects were analyzed.The results show that there are four main kinds of scale defects on the surface:①primary scale formed during roughing process which has not been removed by high-pressure water descaling box after slab is discharged from the furnace;②press-in of secondary scale remaining from high-pressure water descaling box before finishing process;③press-in of tertiary oxide scale formed on the surface of hot rolled steel coil due to wear of oxide film on roll surface during finishing and the subsequent cooling processes;④formation of red scale especially on the steel with high silicon content due to strong engagement between surface oxides and base metal during slab heating process.
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Key words:
- strip steel /
- iron oxide scale /
- surface appearance /
- defect /
- descaling with high-pressure water /
- oxide film
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