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| Quality and Complex Performance of Deformed Steel Bars by the Whole Process Bottom Blowing Nitrogen of BOF |
| LI Yong1,3,WU Wei2,ZHU Qi-zhu3,WEI Zhi-qiang3 |
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110006, Liaoning, China
2. Metallurgical Technology Research Department of Central Iron and Steel Research Institute, Beijing 100081,China
3. Steelmaking work of Fushun New Steel Co., LTD., Fushun 113001, Liaoning, China |
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Abstract Base on the research results of literatures and production condition of BOF, the influences of the smelting process by whole process bottom blowing nitrogen on the quality and complex performance of rolled metal were systematically investigated in the combined blown converter. Through adopting the process of whole process bottom blowing nitrogen and the change-over from nitrogen to Ar (including Ⅰand Ⅱmode), the nitrogen and oxygen content in steel during the refining, casting, the casting blank and rolled metal quality and the complex performance of rolled metal were studied. The results show that the nitrogen content, the inclusion and metallurgical structure grades, the yield strength, tensile strength and percentage elongation after fracture of rolled metal produced by whole process bottom blowing nitrogen and the change-over from nitrogen to Ar have no distinctly difference. However, for same supply gas mode, different supply parameters, there are certain influences on above results. Meanwhile the influence factors of ageing on complex performance of rolled metal were studied.
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Received: 13 June 2011
Published: 20 February 2012
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2012, Vol. 47 
