钢包MgO-C砖抗氧化剂对帘线钢酸溶铝的影响

Effect of antioxidant in MgO-C brick on acid soluble aluminum in tire cord steel

为了避免帘线钢中脆性夹杂物的生成,通过采取控制入炉物料及合金含Al量、LF精炼炉造低碱度渣系的方法,钢液中酸溶铝(Als)质量分数可以控制在9×10^-6左右。通过优化钢包镁碳衬砖抗氧化剂的种类和含量,把抗氧化剂金属Al粉质量分数由1.61%降低至0.15%,其余部分使用等量的Si粉代替,在其它工艺不变的情况下,钢液中w(Als)从8.8×10^-6降低至6.1×10^-6,降幅达30.7%。钢中典型复合夹杂物中Al2O3平均质量分数为8.6%,最大值为23.8%,复合夹杂物可控制在低熔点塑性区。

In order to avoid the formation of brittle inclusions in tire cord steel,the measures that controlling Al content of charge and alloy and making low basicity slag system in LF refining furnace were adopted,and the mass fraction of acid soluble aluminum(Als)in molten steel could be controlled at about 9×10^-6.By optimizing the type and content of antioxidants in ladle magnesia carbon lining brick,reducing the metal Al powder mass fraction from 1.61%to 0.15%,and replacing the rest by the same amount of Si powder,w(Als)in molten steel reduced from 8.8×10^-6 to 6.1×10^-6,with a decrease of 30.7%.The average mass fraction of Al2O3 in typical composite inclusions in steel reduced to 8.6%,while the maximum was 23.8%.The inclusions could be controlled in the plastic zone of low melting point.