Causes analysis of surface defect on 20 seamless steel pipe
JIANG Bi-tao1��YAN Wei-bing1��LIN Teng-chang2
1. Hebei Iron and Steel Group�� Xuanhua Company�� Xuanhua 075100�� China 2. Central Iron and steel Research lnstitute�� Institute for Metallurgical Proeess�� Beijing 100081�� China
Abstract��Fold cracks on the surface of circular tube were reached by using acid pickling�� morphology analysis�� metallographic analysis and electron microscope analysis. The results indicate that the slab surface scratches�� surface and subsurface pore can lead to round steel surface cracks. There are no inclusions inside the round steel crack. The cracks have no inward extending trend. Decarburized layer analysis of circular tube and round steel shows that the cracks on the surface of round steel are the direct cause of surface fold on the steel pipe.
�����Σ������������ڲ�. 20����ܱ���ȱ�ݳ������[J]. �й������ڿ���, 2015, 33(5): 43-47.
JIANG Bi-tao��YAN Wei-bing��LIN Teng-chang. Causes analysis of surface defect on 20 seamless steel pipe. Chinese Journal of Iron and Steel, 2015, 33(5): 43-47.
2015, Vol. 33 
