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| Study on Surface Micro Cracks on Medium Plate |
GENG Mingshan1,HE Kuangnian2，ZHANG Jiongming1,
WANG Xinhua1,XIAO Jiguang2 |
| 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Shaoguan Iron and Steel Group Co., Ltd.， Shaoguan 512123, Guangdong, China |
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Abstract The formation mechanism of surface micro cracks of HSLA medium plates rolled from continuously cast slabs was studied by metallographic analysis,scanning electron microscopy and XEDS analysis.The test results show that some Cu and As are observed near the cracks and the surface micro cracks are along the grain boundaries.The main reason of surface micro crack formation is that Cu、As and Sn are segregated at the austenite grain boundaries forming Cu、As and Sn enriched phase in scale/steel interface by selective oxidation and the hot ductility of steel is deteriorated tremendously,Some countermeasures for preventing surface micro cracks are proposed.
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Received: 01 January 1900
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2008, Vol. 43 
