Effects of Refractories on the Total Oxygen Content and Inclusions in the IF Steel

The effects of refractories of quartz-corundum, consisting of 45mass% quartz and 55mass% corundum, fused corundum and fused magnesia on the total oxygen content (TOC) and the composition of inclusions in interstitial free (IF) steel were stud-ied. 3 mass % microsilica, Was added into the three refractories as binder. The refractories were shaped as lining of the graphite crucible by castable method., IF steel was placed in the crucibles, then they were heated at 1600℃ for 90min and 45min respectively. Oxygen contents of the steel samples were obtained by oxygen determinator . Inclusions were analyzed by SEM and EDS. The results show that the TOC of steel increased with increase of Index of Oxygen Potential (IOP) of the refractories. The steel sample coped with MgO refractories having the lowest IOP has the lowest TOC.

耐火材料对IF钢总氧含量及夹杂的影响

研究了石英 -刚玉质、刚玉质和镁质耐火材料对所处理的IF钢总氧含量和夹杂的影响 ,用氧测定仪对钢中的总氧含量进行了测定 ,并对钢中的夹杂进行了SEM和EDS分析。结果表明 :耐火材料对钢的增氧量的大小与所用耐火材料的氧潜能指数 (IOP)有关 ,IOP越大 ,增氧量越大 ;镁质耐火材料由于有较低的IOP 。