对22SiMn2钢铸坯断裂原因进行了分析,发现断坯部位柱状晶较发达,沿晶分布着较多气孔、裂纹和硫化物、钛化物夹杂,使得铸坯晶界处成为薄弱环节。由于铸坯堆放环境恶劣,反复的升降温使得铸坯内应力得不到充分释放而集中在铸坯晶界处,裂纹沿塑性较差夹杂物扩展,最终导致了铸坯的断裂。研究表明,降低钢水浇铸时过热度,可解决22SiMn2钢铸坯断裂的问题。 The fracture reason of 22SiMn2 steel billet was analyzed. It was found that the columnar crystal was more developed at the billet site, and more pores, cracks, sulfide and titanium compound were distributed along the crystal, making the grain boundary of slab become the weak link. Due to the harsh environment of the slab stack, the repeated heating and cooling caused the stress in the slab not to be fully released and concentrated in the grain boundaries of the slab. The cracks propagated along the poor plastic inclusions and eventually led to the fracture of the slab. Research shows that reducing the superheat of molten steel casting can solve the problem of 22SiMn2 steel slab fracture.