ժҪ ���70 mm ��S355G7+M-Z35���������ּ���[Z]������ƫ�͵������ͨ��������顢ɨ��羵���������ȷ�������[Z]�����ܲ��ϸ�ԭ��������о������������[Z]�����ܲ��ϸ����Ҫԭ���Ǹְ��IJ����������ɿ�����Ϊ����Դ�������ڲ��ϸ������Ͽڴ������Ž϶�Ŀ�״��Nb��Ti��C�ۼ���MnS���ӣ�����ƫ���������ڱ������Ӳ����֯�����Ӿ��˶�����չ������[Z]�����ܲ��ϸ�
Abstract��According to unqualified[Z-direction]property of batches of 70 mm thickness S355G7��M-Z35 steel�� the causes were analyzed by metallographic analysis�� sanning electron microscope observation and energy spectrum analysis. The results show that the main reason for unqualified[Z-direction]property is porosity in the center of the steel that forming source of the crack. There are many bulk (Nb��Ti)C and MnS inclusions at the fracture of the disqualified workpieces. Hard phases such as bainite also appear at the segregation�� which aggravate the fracture expand�� so resulted in the disqualified[Z-direction]property.
���������� ��������ï���� Ρ. S355G7+M-Z35[Z]�����ܲ��ϸ�ԭ�����[J]. �й������ڿ���, 2016, 34(3): 40-44.
TANG Hai-fang��WANG Bao��ZHU Qi-mao��YAN Wei. Reasons analysis on unqualified[Z-direction]property of S355G7+M-Z35 steel plates. Chinese Journal of Iron and Steel, 2016, 34(3): 40-44.
2016, Vol. 34 
