精炼渣对非铝脱氧钢中夹杂物影响的实验研究

Effect of Refining Slag on Inclusions in Non-Aluminum Deoxidation Steel

实验用氧化镁质坩埚在MoSi2炉上进行，实验钢种为重轨钢，选用Si-Ca-Ba合金为脱氧剂。实验发现，随精炼渣碱度（R）的增大，钢液中全氧降低，夹杂物总数、总面积和平均半径减小。精炼渣中w（Al2O3）为13％～20％时夹杂物的总数及总面积最小；硼（Al2O3）〉20％时细小夹杂物比例明显增大。精炼渣中的二氧化硅、三氧化二铝对夹杂物中二氧化硅和三氧化二铝的质量分数有直接影响，其在渣组成为钙斜长石成分的实验中尤为明显。因此，通过控制精炼渣的成分来控制非铝脱氧钢中夹杂物的组成是可行的。

The experiments were carried out by MoSi2 furnace in MgO crucible. The experimented steel was heavy rail steel and Si-Ca-Ba alloy was used as the deoxidizer. The results show that the total oxygen content of steel, and the total quantity, total area and average radius of inclusions decrease with the increasing of basicity （R） of refining slag. The total quantity and total area of inclusions are least when Al2O3 content in refining slag from 13 to 20%, while the proportion of small inclusions increases when more than 20% Al2O3 content. The contents of SiO2 and Al2O3 in inclusions are affected directly by the SiO2 and Al2O3 content in refining slag, especially in slag with CaO·Al2O3·2SiO2. Therefore, it＇s feasible to control the composition of inclusion in non-aluminum deoxidation steel by controlling the composition of refining slag.