Abstract��To the problem of the percent of pass in flaw detection was relatively low for some batches of wind power flange made by S355NL steel from Laiwu Steel Group��the defect positions of unqualified flanges were positioned using ultrasonic wave. Then�� the defect position was sampled and analyzed by metallographic and scanning electron microscope. Finally�� it was confirmed that the central porosity and segregation�� which was caused by over high pouring temperature of liquid steel and the non-uniform secondary cooling of casting blank�� was the main cause of the defects of S355NL steel for wind power flange. Moreover�� the corresponding improvement measures were proposed.
�� ��. ��編���ø�S355NL̽�˲��ϸ����[J]. �й������ڿ���, 2016, 34(2): 38-41.
LIU Bing. Defective analysis on flaw detection of S355NL steel for wind power flange. Chinese Journal of Iron and Steel, 2016, 34(2): 38-41.
2016, Vol. 34 
