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ＡＮＳＯＢ法精炼钢水进行小方坯连铸，对非正常浇注的中间包水口结瘤物和正常浇注过程中的钢水试样，用金相法及电子扫描电镜进行物相分析，确定了结瘤物的组成．并根据试验结果，找出了水口结瘤的主要原因．当ＡＮＳＯＢ铝热法精炼钢水中［Ａｌ］ｓ＞０００２％和［Ａｌ］Ｔ＞０００６％时，就发生堵水口现象．采用最佳操作工艺参数和钙处理，是防止小方坯连铸中间包水口结瘤的有利措施．
ANS OB method of refining molten steel billet continuous casting, tundish non-normal pouring nodular material and the normal casting process of molten steel samples, metallographic and electronic scanning electron microscopy phase analysis to determine the nodules Composition of things. Based on the test results, the main causes of nozzle nodules were found out. When ANS-OB aluminothermic refining of molten steel [Al] s> 0 002% and [Al] T> 0 006%, the occlusion of the phenomenon occurred. Using the best operating parameters and calcium treatment, is to prevent billet tundish nozzle tundish favorable measures.