Sustainable Steel Decarburization by Oxide Addition
The decarburization of liquid steel has been investigated using a new approach involving oxide addition and inert atmosphere instead of the conventional method of blowing oxygen and/or applying vacuum/stirring. The method included preliminary free energy calculations to predict oxide decomposition and CO formation at steelmaking temperature. The experimental method included mixing 1 wt％ Fe2O3, Fe3O4, or NiO to high-purity iron powder containing ≤0.05 wt％ C and ≤0.33 O; rotary mixing for ~8 h, pelletizing at 650 kPa; and instantaneous heating/melting at 1600℃ for 20 min under flowing Ar (1 L/min). LECO(R) analysis, IR gas analysis, and video imaging confirmed that CO formation and evacuation were responsible for decarburization to ultra-low C concentrations. The lowest final C level achieved of 13.6 ppm resulted from Fe2O3 addition. The data confirm that free energy calculations can be used to identify suitable oxide additions. The present work also demonstrates that decarburization to levels sufficient for ultra-low carbon steels (≤50 ppm) can be achieved by a four-stage process: (a) decomposition of the oxide, (b) consequent addition of alloying element and oxygen to the steel, (c) resultant decarburization by CO formation and evacuation, and (d) associated convective homogenization from the effects of the gas.
Oxide addition Decarburization Liquid steel Ultra-low carbon steel
Othman N. Alzeghaibi Charles C. Sorrell Veena H. Sahajwalla
School of Materials Science and Engineering, University of New South Wales, Sydney NSW 2052, Australia
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-9
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）