Process Improvements in EAF, Ladle, and AOD for High Alloyed and Stainless Steel Grades by Gas Purging Excellence

Titelangaben

Kirschen, Marcus ; Ehrengruber, Reinhard ; Spiess, Bernhard ; Rotsch, Jens:
Process Improvements in EAF, Ladle, and AOD for High Alloyed and Stainless Steel Grades by Gas Purging Excellence.
In: 8th European Stainless Steel & Duplex Stainless Steel Conference 2015. - Leoben : Austrian Society for Metallurgy and Materials , 2015 . - 10 S.

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Abstract

Modern production processes of high alloyed and stainless steel grades are subject to the cost-optimized production of raw molten metal in combination with very flexible productivity. Excellent mixing of the steel melt helps to improve mass and heat transfer in the EAF, in order to accelerate the melting of scrap and alloys, decarburization, homogeneous superheating, alloy distribution, and to avoid skull formation and solid remains that may obstruct tapping. A homogeneous distribution of alloys in the molten metal significantly helps avoid concentration gradients and improves yields, especially of chromium. Chromium oxides content in the slag decreases. Higher energy efficiency and lower specific energy demand of the EAF follow. The benefits of direct purging plug (DPP) systems in modern EAF processes are described in detail.
Control on the entire gas purging technology from refractory to valve control and purging strategy is crucial for high reliability and availability of the purging system. With years of purging experience, RHI/INTERSTOP presents an entirely revised gas control system for application at the EAF, Ladles, and AOD converter.