冷镦盘条夹杂堆钢原因分析及改进措施
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摘要
基于堆钢夹杂物和中包水口结瘤物的成分检测结果,通过分析堆钢炉次分布规律和冶炼过程夹杂物平衡计算,发现冷镦线材夹杂堆钢的原因为炼钢过程中生成的Al_2O_3夹杂数量过多,精炼工序钙处理不充分,钙铝酸盐及镁铝尖晶石等固态夹杂物在中包水口累积、脱落进入钢水。针对上述原因,通过降低转炉终点氧质量分数、规范LF精炼底吹氩操作、控制冶炼过程铝质量分数以及延长精炼净吹时间等措施,连铸中包水口结瘤物明显减少,炼钢夹杂导致的堆钢次数由原来的大于10次/月降低到4次/月以下。
Based on the test results of compositions of piling inclusions and tundish nozzle nodulation,through analysis of the distribution rule of piling heat and inclusion balance calculation in steel making process,it is found that the causes of piling up of cold heading steel wire are excessive Al_2O_3 inclusions in steel making process,inadequate calcium treatment of refining,and calcium-aluminate and magnesia-alumina spinel etc. solid inclusions accumulating in tundish nozzles and falling into molten steel. Therefore it is needed to take preventive measures corresponding to those factors.Through the measures such as reducing final oxygen content of converter,normalizing the operation of bottom blowing argon of LF refining,controlling Al content in steel making process and extending soft blowing time of refining,etc,the amount of tundish nozzle nodulation reduces obviously and the numbers of piling which is caused by inclusions in steel making process reduce from the original more than 10 times/month down to less than 4 times/month.
Based on the test results of compositions of piling inclusions and tundish nozzle nodulation,through analysis of the distribution rule of piling heat and inclusion balance calculation in steel making process,it is found that the causes of piling up of cold heading steel wire are excessive Al_2O_3 inclusions in steel making process,inadequate calcium treatment of refining,and calcium-aluminate and magnesia-alumina spinel etc. solid inclusions accumulating in tundish nozzles and falling into molten steel. Therefore it is needed to take preventive measures corresponding to those factors.Through the measures such as reducing final oxygen content of converter,normalizing the operation of bottom blowing argon of LF refining,controlling Al content in steel making process and extending soft blowing time of refining,etc,the amount of tundish nozzle nodulation reduces obviously and the numbers of piling which is caused by inclusions in steel making process reduce from the original more than 10 times/month down to less than 4 times/month.
引文
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[4]谢杰智,寻忠忠,黄德智.10B21冷镦开裂原因分析[J].连铸,2017,42(4):32.