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结合某厂的生产实际,对超低碳钢M2A1不同工序阶段、头坯及正常坯夹杂的数量、形貌、成分进行了分析,找到了超低碳钢头坯夹杂物偏高的主要原因,并通过优化开浇准备工作、开浇吨位、氩气控制,采用塞棒代替普通钢质开浇管进行开浇,对中包开浇升速曲线进行优化及按照不同断面设定出苗时间等措施,使头坯质量得到一定的改善。优化后,头坯沿浇铸方向的T.O和N含量、夹杂物总量及数量都有不同程度的降低,沿头坯浇铸方向2.5 m处w(T.O)从优化前的0.003 6%降低到0.002 5%,每10 kg铸坯中夹杂物总量由11.50 mg降低到8.26 mg,单位面积夹杂物个数由8.73个降至6.26个,铸坯沿头坯浇铸方向2.5 m处达到正常坯水平。
According to the actual production in a certain factory, the quantity, morphology and composition of inclusions in the M2A1 ultra-low carbon steels were analyzed. The main reasons for the high inclusions in the ultra-low carbon steel were found. And by optimizing the pouring preparation work, open pour tonnage, argon control, using plug instead of ordinary steel pouring pouring tube pouring, pouring speed curve of the package optimization and according to the different sections set the emergence time and other measures , So that the quality of the billet to be some improvement. After optimization, the amount of TO and N, the total amount of inclusions and the amount of inclusions along the casting direction all decreased to some extent. The w (TO) at 2.5 m along the casting direction decreased from 0.003 6% before optimization to 0.002 5 %, The total amount of inclusions per 10 kg slab decreased from 11.50 mg to 8.26 mg, the number of inclusions per unit area decreased from 8.73 to 6.26, and the slab reached the normal blank level at 2.5 m along the casting direction.