In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al₂O₃-CaO inclusions reacted with the bulk steel and transformed to CaS-Al₂O₃-MgO-(CaO) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly CaS-Al₂O₃-MgO-(CaO) in slab center and were MgO-Al₂O₃-CaO-CaS within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.

在当前的研究中，研究了非金属夹杂物的成分从钢水向凝固钢的转变，并预测了线形连铸坯横截面上夹杂物的成分分布。在连铸坯的冷却和凝固过程中，Al ₂ O ₃ -CaO夹杂物与散装钢反应并转化为CaS-Al ₂ O ₃-MgO-（CaO）连铸坯。由于冷却速率的变化，板坯横截面上的夹杂物成分随位置而变化。建立了一个模型，以预测夹杂物成分在连铸坯截面上的分布，连铸的凝固与传热耦合，固体钢中固溶元素的动态传质以及热力学计算在不同温度下的夹杂物转变。夹杂物的组成转变主要发生在管线钢的液相线和固相线之间的温度下。夹杂物主要为板中心的CaS-Al ₂ O ₃ -MgO-（CaO），为MgO-Al ₂ O _3。-CaO-CaS在平板的地下。在平板中，夹杂物的转化率在拐角处小于10％，而在平板表面以下50 mm处达到70％。