JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2010, Vol. 40 ›› Issue (3): 75-79.

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The optimization of ultra-low sulfur steels produced by the 120t converter system in the Laiwu Iron & Steel Group

WANG Qing-chun1, LI Mu-sen2, FAN Shu-lu3, ZHANG Ji-jun3   

  1. 1. Metallurgical Institue,Shandong Vocational College of Industry, Zibo 256414, China;
    2. School of Material Science & Engineering, Shandong University, Jinan 250061, China;
    3. Laiwu Iron & Steel Group, Laiwu 271126, China
  • Received:2009-12-24 Online:2010-06-16 Published:2009-12-24

Abstract:

Based on the thermodynamics and kinetics of desulphurization theory, an ultralow sulfur converter steelmaking process and operation system in the Laigang 120t converter system was analyzed. By controlling the converter resulfurization smelting, the deep desulfurization technological process was optimized. The results showed that the sulfur content can be reduced to below 0.005%. The desulphurization rate can be increased to 80% and therefore the final sulfur content could reach to 0.001%. Consequently, low sulfur steel with sulfur content below 0.005 % could be stably produced. In the following LF refining, SiO2 content in LF top slag could be reduced to below 8%. The final (FeO+MnO) content could be reduced to about 1% and the alkalinity can be controlled between 5 and 6.

Key words: converter resulfurization, top slag improvement, slag splashing protection, deep desulfurization

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