Abstract��In view of disqualified elongation of Q235B medium plate in tensile test�� the macroscopic fracture�� morphology and metallographic structure were observed and analyzed by scanning electron microscope and metallographic microscope. The analysis results showed that the nonmetallic inclusions in medium plate�� the inhomogeneous banded structure and internal stress were the main cause for the disqualified elongation of steel plate. Correspondingly�� a series of process improvement and optimization measures were proposed to effectively solve the problem of disqualified elongation.
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��ʿ������ ǿ��������. Q235B�к���쳤�ʲ��ϸ�ԭ�����[J]. �й������ڿ���, 2016, 34(1): 10-13.
LIU Shi-wang��LIU Qiang��WANG Wen-shao. Cause analysis of disqualified elongation of Q235B medium plate. Chinese Journal of Iron and Steel, 2016, 34(1): 10-13.
2016, Vol. 34 
