The quality of micro-alloyed steel slab in continuous casting has always been plagued by surface transversal crack.Because of its many influential factors,so far,it has not been solved very well.Based on the two main features of the transversal crack in the continuous casting process(temperature feature,microstructure feature),researches at home and abroad were taken to find the way to solve the problem of transversal crack.Firstly,the internal and external factors affecting the occurrence of transversal cr...