Abstract：The occurrence rate of surface defects of low carbon boron steel wire rod produced by a factory was very high for a long time， hence the surface defects on wire rod were analyzed. According to the macro-morphology， the surface defects leading to defective products can be divided into three types： scarring defect， pits defect and serrated defect. The defect samples were corroded by metallographic chemical etching method， then the microstructure was observed by metallographic microscope， all the three type defects showing three major characteristics： iron oxide layer is inside the defect， ferrite grain grows abnormally beside the defect， and the defects are located at the junction of the metal rheology. It is inferred that the formation of surface defects of the wire rod is caused by the already existing surface cracks on billet before rolling. The numerical simulation and rolling simulation method were used to verify the infer， and the results show that the above inference is established， the formation of the surface defects of the wire rod is indeed caused by the surface crack of the billet.
2018, Vol. 37 
