Analysis on Types and Causes of Surface Scab on Steel Plate
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摘要: 通过金相显微镜、扫描电镜和能谱仪等检测手段,对热轧生产线生产中出现的主要结疤类缺陷进行了归纳总结。结果表明:结疤类缺陷主要分为有焊接瘤压入类、转炉碱性渣卷入钢坯类、精炼渣卷入钢坯类及连铸坯气泡类等类型。在分析各类结疤缺陷的成因及影响因素的基础上,提出安装去毛刺设备,调整转炉炼钢及精炼过程和中间包冶炼制度,促进夹杂物上浮,制定合理钢包和中间包烘烤制度,检查结晶器装置是否渗水等相应的预防工艺措施。Abstract: Main scab defects arising in a hot rolling line were studied through metallographic microscope,scanning electron microscope and energy spectrometer.The results show that the formation of scab defects can be attributed to press-in of welding tumor,entanglement of converter alkaline slag and refining slag into slab,and bubbles in continuously cast strand.After causes and influencing factors of defects were analyzed,countermeasures were put forward,including installing burring device,renovating converter steelmaking and refining process and tundish smelting system,promoting inclusion floating and making reasonable baking mechanism for ladle and tundish,and taking such preventive measure as checking the mold for seepage.
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Key words:
- hot-rolled plate /
- scab /
- steel defect /
- slab
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