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Transactions of the Indian Institute of Metals

, Volume 70, Issue 10, pp 2651–2660 | Cite as

On Increasing Mn Recovery During Production of Mn-Based Stainless Steel

  • Chandrakant V. Sharma
  • J. R. Trivedi
  • S. K. Chaudhury
Technical Paper
  • 70 Downloads

Abstract

Recovery of Mn in steel making process depends on various processing parameters such as temperature, flow rate ratio of oxygen and argon gas in AOD process, carbon content, slag basicity, and V-ratio, Si content etc. The effect of these process parameters on Mn recovery in Mn-based stainless steel production is studied and optimized to maximize Mn recovery. It is observed that highest Mn recovery is achieved when slag basicity is maintained in the range of 1.7–1.8 and V-ratio is kept at 1.5. Further, it is noted that at high temperature, recovery of Mn is less because loss of Mn due to oxidation increases exponentially with the increase in temperature. Maximum Mn recovery is observed at 1585 °C bath temperature. Reduction of MnO with coke forms CO2 gas and free Mn in the melt. To maximize recovery of Mn in stainless steel, it is of paramount importance that oxidation of Mn is reduced and reduction of MnO is accelerated. Oxidation of Mn is minimized by reducing the flow rate of oxygen and reduction of MnO is accelerated by adding adequate amount of coke to the molten charge.

Keywords

Mn recovery Slag basicity V-ratio Foamy slag Mn based stainless steel Nitrogen oxygen decarburization (NOD) 

Notes

Acknowledgement

Authors are thankful to the technical team at Shah Alloys Ltd., Ahmedabad, India for supporting us in performing various production trials and providing valuable suggestions throughout this project work.

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Copyright information

© The Indian Institute of Metals - IIM 2017

Authors and Affiliations

  • Chandrakant V. Sharma
    • 1
  • J. R. Trivedi
    • 2
  • S. K. Chaudhury
    • 3
  1. 1.MMD Rolling MillsAhmedabadIndia
  2. 2.Quality ControlShah Alloy Ltd.AhmedabadIndia
  3. 3.Department of Metallurgical and Materials EngineeringIndus UniversityAhmedabadIndia

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