采用传统小方坯结晶器铸坯在凝固时,由于铸坯角部收缩,坯壳被拉离结晶器壁,由此产生了较大空隙,使导热率降低,角部坯壳生长速度随之明显降低致使坯壳生长速度严重不匀,因而铸坯极易出现纵向裂纹和挠曲缺陷。另外,坯壳的表面温差亦很大。据测,这种温差一般为90～100℃,甚至更大。这样大的温差使坯壳产生较大的内应力。当铸坯离开结晶器时其抗菱变的能力较差,纵向角裂 When the billet of traditional billet mold is solidified, the blank shell is pulled away from the mold wall due to the shrinkage of the corner of the billet, thereby resulting in larger voids that reduce the thermal conductivity and the growth rate of the corner shell along with it Significantly reduce the resulting rough shell growth rate of uneven, so prone to longitudinal cracks and bending defects. In addition, the surface temperature of the shell is also very large. It is measured, this temperature is generally 90 ~ 100 ℃, or even larger. Such a large temperature difference makes the shell produce greater internal stress. When the slab left the crystallizer, its anti-rhodamine ability is poor and longitudinal fissures