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| Study of Flaws in Heavy and Medium Plate |
| SUN Qisong1,WANG Xinhua1,XU Xiaodong2,JIANG Dongcai2,BAI Xuejun2 |
| 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Technology and Quality Office, Shouqin Metal Materials Co., Ltd., Qinhuangdao 066001, Hebei, China |
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Abstract Flaws in the heavy and medium plate of different thickness detected by ultrasonic detector were studied. Conclusions are: firstly, flaws are caused by microcracks in the pearlite band at the center area of the plate; secondly, microcracks mostly appear in the pearlite band wider than 25 μm located in the centerline segregation area; thirdly, the interface between MnS type plastic inclusions and the matrix is the source of cracks; fourthly, microcracks form after the hot rolling and at the temperature lower than 700 ℃. The internal condition for cracking is the centerline segregation of slab and the external is the tensile stress of slab formed during cooling or straightening.
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Received: 01 January 1900
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2007, Vol. 42 
