结构用钢不得影响材料和机械性能的裂纹、分层、重皮、夹渣等缺陷麻点或划痕的深度不得大于钢材厚度负公差的1/2，且不应大于0.5mm。

Structural steel shall not affect the material and mechanical properties of the crack, delamination, pitting defects such as double skin, slag or scratches depth shall not be greater than the thickness of the steel minus tolerance of 1/2, and should not be greater than 0.5 mm.