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| Study on Nonmetallic Inclusions of High Quality Microalloyed Forging Steel for Automobile |
ZHUO Xiaojun1,YANG Chenwei1,L Naibing1,WANG Xinhua1,
CUI Jingyu2,WANG Kun2 |
| 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Technical Research Institute of Shougang Group， Beijing 100041, China |
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Abstract The manufacture process “BOFLFVDCC” of microalloyed forging steel for automobile was investigated systematically, especially the formation principle of nonmetallic inclusions. Steel and slag samples were taken in every stage of manufacture process, and these samples were analyzed.The morphology and composition of nonmetallic inclusions in steel sample were analyzed using SEMEDX systematically. The results show,that phosphorus content and total oxygen content in slab could be controlled below 0.012% and around 0.001% respectively.Most inclusions found in the slab were large pure irregular MnS. Few complex inclusions (oxide with MnS) around 2 μm were found,in which oxide was wrapped by MnS.The ultralow oxygen microalloyed forging steel manufactured by this route could satisfy the requirements for automobile.
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Received: 01 January 1900
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2008, Vol. 43 
