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在钢包炉对高强钢进行二次精炼的过程当中,使用铝对钢水进行脱氧。通过向钢水中加入硅钙对铝酸盐夹杂进行变性处理。在二元相图的基础上,钙处理之后形成了不同成分及形态的CaO-Al203固体及液体铝酸钙。在加入硅钙期间,硫化锰也得到了变性,形成了CaS或者(Ca,Mn)S,并环绕在铝酸钙旁边。由于在加硅钙时,钙泡泡上升,所以就会出现很剧烈的钢水搅动。这使得夹杂聚集并与渣反应。此外,形成了MgO.Al2O3尖晶石。在连续浇筑小方坯的过程中中包水口堵塞的情况可能会发生。在水口内壁形成的渣壳由尖晶石,不同成分的铝酸钙以及钙锰硫化物组成。
During the secondary refining of high strength steel in the ladle furnace, aluminum is used to deoxidize the molten steel. The aluminate inclusions were denatured by adding calcium silicate to the molten steel. Based on the binary phase diagram, CaO-Al203 solid and liquid calcium aluminate with different compositions and morphologies were formed after calcium treatment. Manganese sulfide has also been denatured during the addition of calcium silicate to form CaS or (Ca, Mn) S, which is surrounded by calcium aluminate. Due to the addition of calcium silicate, calcium bubbles rise, so there will be very violent molten steel stirring. This allows the inclusions to aggregate and react with the slag. In addition, MgO.Al2O3 spinel was formed. In the continuous pouring of billet in the process of blockage in the nozzle may occur. The skull formed on the inner wall of the nozzle consists of spinel, calcium aluminate of different composition and calcium manganese sulfide.