Formation and control on the surface defect of hypo-peritectic steel in continuous casting: A review

Hypo-peritectic steel is widely used in many industrial fields attributed to its excellent combination of high strength, high toughness, high processability, high weldability and low material cost. However, surface defects are quite liable to occur during continuous casting, including depression, longitudinal crack, deep oscillation mark, and severe level fluctuation with slag entrapment. It is still a great challenge to produce hypo-peritectic steel in high efficiency mode by continuous casting due to the limited understanding on the mechanism of peritectic solidification. This work reviews the definition and classification of hypo-peritectic steel, and introduces the formation tendency of common surface defects related to peritectic solidification. The new achievements on the mechanism of peritectic reaction and transformation have been listed. At last, the countermeasures to avoid the surface defects of hypo- peritectic steel has been summarized. It is helpful for the researcher to get some enlightening points in continuous casting of hypo-peritectic steel and develop new technique to overcome the present problems.