Surface Longitudinal Crack Measurement and Analysis for SS400 Steel Sheet
WANG Quan1,GUAN Jian-xia2,HUANG Nan2
1. Material and Metallurgy School, University of Science and Technology Inner Mongolia, Baotou 014010, Inner Mongolia��China 2. Compact Strip Production Plant of Baotou Steel��Baotou 014010, Inner Mongolia��China
Abstract��Surface longitudinal cracks were macroscopically observed and macroscopically analyzed for SS400 steal sheet which occurred in the production process. The results showed that most of the longitudinal cracks were distributed in the couple of 1/4 areas along the width direction of the steal sheet as parallel beam or reticulate form. The length and the depth of the cracks were 0.5��2 mm and 0.1��0.2 mm��respectively��and the width was less than 1 mm. Complex inclusions which composed of Na��Mg��Al��Si��Cl��K��Ca, etc. were found along the width of the cracks��whatever it is longitudinal crack or transverse crack��while only ferric oxide was found inside the cracks. Further analysis showed that such surface cracks originally formed in the successive mould��and further enlarged by the following secondary cooling and furnace heating.
�ո�����: 2011-09-20
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E-mail: wqcsp@sina.com
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��Ȩ���ؽ��������. SS400�ְ���������Ʋ��������[J]. �й������ڿ���, 2012, 30(3): 42-47.
WANG Quan1,GUAN Jian-xia2,HUANG Nan2. Surface Longitudinal Crack Measurement and Analysis for SS400 Steel Sheet. Chinese Journal of Iron and Steel, 2012, 30(3): 42-47.
2012, Vol. 30 
