合金化对铝镇静钢中夹杂物的影响

 为了研究合金化过程对钢液洁净度的影响规律，分析了一种铬铁合金中的夹杂物类型，并采用这种合金在实验室开展合金化试验。通过对比合金化前后钢中的夹杂物类型，研究了合金化过程中夹杂物的演变行为。研究发现，合金和钢中的夹杂物类型超过9种。其中，合金中的夹杂物主要为Cr2O3 SiO2 MnO系夹杂物和Cr2O3 SiO2 MnO包裹SiO2系夹杂物。合金化后，这些由合金带入的夹杂物均在钢液中逐渐消失，并全部转变为氧化铝夹杂物。合金化实际上是一个污染钢液的过程，在工业精炼晚期进行合金调整，钢中会生成大量的氧化铝夹杂物，增加浸入式水口堵塞的可能性。为了尽可能改善钢液质量和避免水口堵塞，合金化应尽量在精炼前期完成。

Effect of alloying on inclusions in Al killed steel #br#by a ferrochromium alloy

 In order to understand the effect of alloying process on steel cleanliness, alloying experiments are carried out by using a kind of ferrochromium alloy. The types of the inclusions in the alloy and the steel are detected, and the evolution of inclusions is investigated. More than nine types of inclusions are found before and after experiments. Cr2O3 SiO2 MnO system inclusions and Cr2O3 SiO2 MnO system inclusions with some silica islands inside are the main types of inclusions in the alloy. After alloying, most of the types of inclusions presented in the alloy disappear and transform into alumina inclusions in the liquid steel. Alloying process would worsen the cleanliness of liquid steel, and can be seen as one of the reasons to generate alumina inclusions at the late stage of industrial refining process. Alloy adjustment should be finished as early as possible during refining process to improve steel cleanliness and prevent clogging.