钢中非金属夹杂物绝大多数为较低熔点夹杂物,可以显著改善钢材的抗疲劳破坏性能.对炉渣-钢液-夹杂物间相互作用进行了实验室研究,发现钢中MgO-Al2O3系高熔点夹杂物的比率随渣-钢反应时间增加而减少,与Al2O3的质量分数为20%和CaO/SiO2约为5的炉渣相比,采用Al2O3的质量分数为41%和CaO/SiO2约为6.5的炉渣,CaO-MgO-Al2O3-SiO2系夹杂物的比率由24.3%增加至81.7%,大多数夹杂物位于较低熔点成分区域(≤1500℃).
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