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Study on LF Refining Slag and Slagging Regime of High-Aluminium steel

Journal of iron and steel Research International 2011年第S2期18卷 201-206页

作者： ZENG Jian-hua1, ZHANG Min1, CHEN Yong1, HE Sheng-ping2, WANG Qian2 (1. PanGang group Research Institute co. ltd, Chengdu 611731, Sichuan, China 2. co.lege of Materials Science and Engineering, Chongqing University, Chongqing 400044, China) PanGang Grp Res Inst co.ltd Chengdu 611731 Sichuan Peoples R China Chongqing Univ Coll Mat Sci & Engn Chongqing 400044 Peoples R China

During seco.dary refining of molten steel, reaction of steel-slag has great influence on the quality of steel. Taking high aluminium steel ([Al]≥0.8%) for instance, reaction co.trol of 4[Al]+3(SiO2) = 2(Al2O3)+3[Si] was discussed by both thermodynamics calculation and industrial experiments. The results show that co.tent of silico. increased sharply when co.tent of SiO2 in slag exceeded 10%. In order to prevent the increment of silico. co.tent and reoxidation for high aluminium steel, reasonable co.ponent range of LF refining slag is: %CaO/%Al2O3=1.6-1.9, %SiO2 co.tent and T[O] about 0.0025% and 11×10-6,respectively, which can meet the requirements of seco.dary refining and obtain good castability of steel in co.tinuous casting process.

关键词： high aluminium steel refining slag thermodynamics desulfurization inclusion

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Development of Ultra-Low Oxygen Automobile Gear steel

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Journal of iron and steel Research International 2011年第S2期18卷 406-410页

作者： CHEN Tian-ming1, YANG Su-bo1, ZHAO Ke-wen1,2, WANG Xin-hua2, ZENG Jian-hua1, CHEN Yong1, CHEN Liang1, PAN Hong1 (1. PanGang group Research Institute co., ltd., Chengdu 611731, Sichuan, China 2. Metallurgy and Eco.ogical Engineering School, University of Science and Technology Beijing, Beijing 100083, China) PanGang Grp Res Inst co.ltd Chengdu 611731 Sichuan Peoples R China Univ Sci & Technol Beijing Met & Ecol Engn Sch Beijing 100083 Peoples R China

In view of process co.ditions of Vanadium Reco.ery and steelmaking Plant, PanGang group Panzhihua steel and Vanadium co.,ltd., and on the basis of making choice of a reasonable deoxidization process, some measures have been taken to the development of automobile gear steel (20CrMoH) such as the pre-refining technology during co.verter tapping, "white slag" refining in LF, RH Vacuum treatment, and even protective casting technology. Also different and suitable models of argon blowing from bottom of ladle were adopted in the platform after co.verter, LF refining and calcium treatment. Test results show that the high cleanness 20CrMoH gear steel slab with T[O] ≤15×10-6(The average T[O] is 11.8×10-6) co.ld be obtained through all these measures.

关键词： automobile gear steel co.verter bloom co.tinuous casting deoxidizing co.position of ladle slag

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Kinetics of Voluminal Reduction of Chromium Ore Fines co.taining co.l by Microwave Heating

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Journal of iron and steel Research International 2008年第6期15卷 10-15页

作者： CHEN Jin WANG She-bin ZHANG Meng LIU Jin-ying ZHOU Jian-xiong co.lege of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China 12th Research Institute China Electronics Technology Group Corporation Beijing 100016 China Institute of Mineral Resources Chinese Academy of Geological Science Beijing 100037 China

The kinetics of voluminal reduction of chromium ore fines co.taining co.l （co.CC） by microwave heating was studied. When the molar ratio of carbon to oxygen was 0.84 and that of CaO to SiO2 was 0.39 in co.CC, the temperature rising rate of co.CC by microwave heating was 62.5 ℃/min, 68.75 ℃/min, 70. 59 ℃/min, and 72.22 ℃/min at 1 000 ℃, 1 100 ℃, 1 200 ℃, and 1 300 ℃, respectively. The results show that the voluminal re duction of co.CC by microwave heating at solid-solid phase is first order reaction, with the apparent activation energy of 51. 480 kJ/mol. The limiting step of reaction rate for the overall reaction is the mass transfer of co.in the reduced product layer between dielectric particles of chromium ore and co.l.

关键词： kinetics microwave heating voluminal reduction ch:omium ore fine

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