Q370qD桥梁结构钢断后伸长率不合格原因OA

Aiming at the problem of unqualified elongation of Q370qD bridge structural steel after fracture,the reasons for unqualified elongation after fracture were analyzed by means of macroscopic examination,chemical composition analysis,metallographic examination and scanning electron microscope analysis.The results show that the main reason for the unqualified elongation of Q370qD bridge structural steel after fracture was that the surface of the steel plate was hardened during rolling,and there were inclusions and banded structures in the center.Finally,specific improvement measures were put forward from the perspective of process control of continuous casting,rolling and other processes,which provided a scientific basis for the stable production of the steel.