层状撕裂通常发生在厚钢板中。其主要成因是钢板中的MnS夹杂物在受到垂直于板面的拉应力下发展成裂纹后撕裂,导致结构的低塑性破坏。薄钢板由于较少受到板厚方向的拉应力,一般不会产生层状撕裂问题,但如果薄钢板中存在MnS夹杂物偏析,在板材受到厚度方向的拉应力时,也会产生层状 Layered tearing usually occurs in thick steel plates. The main reason is that the MnS inclusions in the steel sheet develop cracks and tear after being subjected to tensile stress perpendicular to the slab, resulting in low plasticity of the structure. Thin steel sheets generally do not suffer from the problem of lamellar tearing due to less tensile stress in the direction of plate thickness. However, if MnS inclusions segregate in the steel sheet, tensile stress in the thickness direction is also produced