Abstract��The phenomenon of the longitudinal crack was detected by ultrasonic test on the bar surface of 38B3 auto-motive steel. Metallographic microscope and scanning electron microscope were used to observe and analyze the crack sample. The oxide inclusions of Al, Si, Na were found to form mainly under the surface of the continuous casting billet. The crack was produced along the place where the oxide inclusions were concentrated by the stress during rolling. Some measures were carried out to improve the technique so that the casting billet with high quality could be obtained continuously.
���ޣ�Ԭʯ��. ����38B3̽�˲��ϸ��ԭ��������Ľ�[J]. �й������ڿ���, 2012, 30(5): 48-50.
CUI Hong-yan,YUAN Shi-jin. Failure Analysis and Improvement of Bar 38B3 Flaw Detection. Chinese Journal of Iron and Steel, 2012, 30(5): 48-50.