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首先分析了37Mn-1与37Mn5成分、过程控制及生产结果方面的异同点,指出37Mn-1与以往其它钢种气孔缺陷的不同之处,排除了石灰、结晶器保护渣、夹杂物等对气孔缺陷的直接影响,同时,VD真空处理后的[H]质量分数在1.5×10-6以下,排除由氢气引发气孔的根源。其次,通过观察结晶器液面振动曲线发现,浇注37Mn-1过程中液面波动相当剧烈,浇注37Mn5时液面正常。因此,液面波动是造成此次气孔缺陷的主要原因,而引起液面波动的主要原因是钢液二次氧化导致的水口结瘤。
First, the similarities and differences between 37Mn-1 and 37Mn5 in terms of composition, process control and production results were analyzed. The differences between 37Mn-1 and other conventional steels were pointed out, and the differences of porosity, inclusions, The direct effect of defects, at the same time, VD vacuum treatment [H] mass fraction of 1.5 × 10-6 below, ruled out by hydrogen-induced stomatal origin. Second, by observing the vibration curve of the liquid level of the mold, it is found that the liquid level fluctuates quite drastically during the pouring of 37Mn-1, and the liquid level is normal when pouring 37Mn5. Therefore, the fluctuation of the liquid level is the main reason of the porosity defects, and the main reason of the liquid level fluctuation is the junction nodules caused by secondary oxidation of molten steel.