几种钢包用含碳耐火材料对IF钢增碳的比较

通过感应炉试验分析了钢包渣线用3种碳含量不同的镁碳砖(C的质量分数分别为8.3%、15.5%和17.9%),钢包底用蜡石-碳化硅砖(C的质量分数为3.71%)以及实验室开发的MgO-Al2O3-SiC质钢包渣线浇注料(C的质量分数为4.07%)对IF钢增碳的影响,并对其增碳的机理进行了初步分析讨论。试验结果表明:渣线镁碳砖的碳含量越高,对IF钢造成的增碳量越大;包底蜡石-碳化硅砖对IF钢水的增碳量达到渣线镁碳砖的7.73倍;MgO-Al2O3-SiC质浇注料也对IF钢产生明显的增碳效果,不宜用作冶炼超低碳钢的钢包渣线材料。

Study of carbon pick up of IF steel caused by carbon containing refractories

The influences of some carbon containing ladle refractories,namely the MgO-C bricks for ladle slag line,the pyrophyllite-silicon carbide bricks for ladle bottom,and the newly developed MgO-Al_2O_3-SiC castable for ladle slag line,on the carbon pick up of IF steel were studied in laboratory,and the correlative carbon pick up mechanism was primarily discussed.The test results indicate that: the carbon pick up of IF steel caused by MgO-C bricks for ladle slag line increases with the carbon content of the MgO-C bricks;the carbon pick up of pyrophyllite-silicon carbide bricks achieves as 7.73 times as that of MgO-C bricks for ladle slag line;the MgO-Al_2O_3-SiC castable also leads to so obvious carbon pick up of IF steel that it is not suitable for being used as ultra-low-carbon steel smelting refractory.