Abstract��Q345R hot-rolled coil with unqualified elongation was analyzed. The results showed that the elongation of Q345R hot-rolled coil was unqualified due to the pretty much amount of MnS and Al2O3 inclusion existing in steel; and the micro-structure of hot-rolled coil was asymmetrical along with the direction of thickness, with large amount of bainite + widmanstatten structure in upper side and majorly ferrite + pearlite structure from center to lower side of the strip. Thus, the banded structure of coil was not the reason for elongation disqualification.
��������������. Q345R��������쳤�ʲ��ϸ�ԭ�����[J]. �й������ڿ���, 2015, 33(2): 31-34.
LIU Yang-chun�� GUO Hui-min. Cause analysis on unqualified elongation of Q345R hot-rolled coil. Chinese Journal of Iron and Steel, 2015, 33(2): 31-34.
2015, Vol. 33 
