无取向硅钢冶炼过程中的夹杂物遗传变化

Heredity of Non-Metallic Inclusion of Non-Oriented Silicon Steel During Steel Making Process

研究表明,硅钢中的夹杂物对成品带钢的磁性能有显著影响。为研究冶炼过程硅钢中的夹杂物遗传变化,进而提出更有效的控制措施加以去除,本文结合典型的无取向硅钢生产炉次,采用非水溶液电解提取+扫描电镜观察方法分析冶炼过程中上述炉次典型试样的夹杂物。结果表明:转炉冶炼结束、RH精炼开始时,钢的氧化物夹杂总量最大,约为0.23%;RH精炼过程中,氧化物夹杂总量不断降低,并在脱碳结束时达到最低,约为0.02%;连铸过程中,氧化物夹杂总量仍有不断降低趋势,但夹杂物的平均尺寸变化不大。本试验条件下,中间包试样的夹杂物数量约为1.59×104个/mm3。

As we all know, the non-metallic inclusion effects magnetic properties of silicon steelsheets obviously. The article aims to study the heredity of non-metallic inclusion in non-orientedsilicon steels during the steel making process, and then provides a more effective controllingmeasure to remove the inclusions. Based on the typical non-oriented silicon steel charges, thenon-aqueous solution extraction and SEM observation were adopted to analyze the non-metallicinclusions. Results show that, the total oxide reaches the maximum 0.23% at the beginning of RHrefining, then decreases gradually, and reaches the minimum 0.02% during the RH refiningprocess. The total oxide inclusion decreases continuously during the CC casting, but the averagesize of inclusion is nearly stable. In the present work, the total inclusion amount in tundish isabout 1.59×104/mm3.