碳质量分数处于0.09%~0.16%的钢种称为亚包晶钢。在连铸过程中,钢水要经过相变、结晶等一系列过程,特别是当钢的碳含量处于包晶反应区域内时,由于包晶反应的发生,液相与δ相几乎同时消失转变为奥氏体,造成较大的体积收缩,增大了铸坯与结晶器之间的空隙,热阻相 Steel with a carbon mass fraction of 0.09% to 0.16% is called sub-peritectic steel. In the continuous casting process, the molten steel undergoes a series of processes such as phase transformation and crystallization. Especially when the carbon content of the steel is in the peritectic reaction zone, the liquid phase and the δ phase disappear almost at the same time due to the peritectic reaction Austenite, resulting in a larger volume shrinkage, increasing the gap between the slab and mold, thermal resistance phase