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Article

Phase Equilibrium Diagram for Electric Arc Furnace Slag Optimization in High Alloyed Chromium Stainless Steelmaking

1
Thermal Process Engineering, University of Bayreuth, Universitätsstrasse 30, D-94557 Bayreuth, Germany
2
Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-Gu, Seoul 08826, Korea
3
RHI MAGNESITA, Magnesitstrasse 2, A-9700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Metals 2020, 10(6), 826; https://doi.org/10.3390/met10060826
Received: 25 May 2020 / Revised: 16 June 2020 / Accepted: 18 June 2020 / Published: 20 June 2020
The electric arc furnace (EAF) process for steelmaking of Cr and Ni high alloyed stainless steel grades differs significantly from the steelmaking process of carbon steel due to the special raw materials and generally lower oxygen consumption. The special slag chemistry in the EAF process affects slag foaming and refractory wear characteristics due to an increased content of CrOx. A special slag diagram is presented in order to improve monitoring and control of slag compositions for Cr alloyed heats, with special focus on saturation to MgO periclase and dicalcium silicate C2S in order to minimize MgO losses from the refractory lining and to improve slag refining capability by avoidance of stable C2S. With the same diagram different EAF process strategies can be efficiently monitored, either at elevated CaO and basicity with lower spinel concentration and more liquid process slags near C2S saturation or at lower CaO content and basicity with increased spinel concentration and stiffer slags at MgO saturation but certainly no C2S stability. Examples for three industrial EAFs are given. View Full-Text
Keywords: electric arc furnace; stainless steel making; slag modelling; phase diagram electric arc furnace; stainless steel making; slag modelling; phase diagram
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MDPI and ACS Style

Kirschen, M.; Jung, I.-H.; Hackl, G. Phase Equilibrium Diagram for Electric Arc Furnace Slag Optimization in High Alloyed Chromium Stainless Steelmaking. Metals 2020, 10, 826. https://doi.org/10.3390/met10060826

AMA Style

Kirschen M, Jung I-H, Hackl G. Phase Equilibrium Diagram for Electric Arc Furnace Slag Optimization in High Alloyed Chromium Stainless Steelmaking. Metals. 2020; 10(6):826. https://doi.org/10.3390/met10060826

Chicago/Turabian Style

Kirschen, Marcus, In-Ho Jung, and Gernot Hackl. 2020. "Phase Equilibrium Diagram for Electric Arc Furnace Slag Optimization in High Alloyed Chromium Stainless Steelmaking" Metals 10, no. 6: 826. https://doi.org/10.3390/met10060826

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