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2011 February Issue
Full Table of Contents
Electric Steelmaking Technologies
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About the Cover
The largest EAF in the world, a Danieli 420-tonne twin-electrode DC with continuous charge system, was installed at Tokyo Steel's Tahara Plant in July 2010. In addition to the furnace and charge system, Danieli's scope included all additional equipment and auxiliary services necessary for the annual production of up to 2.6 million tonnes of quality steel. The Italian steel plant and equipment supplier will also operate a corresponding-size ladle furnace and twin-vacuum system, in-stalled in the same single-bay meltshop, for the production of low- and ultralow-carbon and Al-killed steel grades. Tokyo Steel's goals for its new EAF included the achievement of highly efficient operating results with the lowest manpower and specific energy consumption.
Photo courtesy of Danieli.
Full magazine available in the Members Only Area |
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Technical Features Table of Contents |
| 35 |
CMC Steel Arizona: A Micro-Mill With Maximum Potential
Theodore Leczo, industry consultant (tjleczo@hotmail.com)
Commercial Metals Co. is operating the first of a new generation of steel mills, a micro-mill, producing rebar in the desert southeast of Phoenix, Ariz. This one-of-a-kind facility, located in Mesa, is the precursor of a new generation of electric arc furnace steelmaking mills serving regional needs for steel products. |
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| 42 |
Single-Charge EAF Modification: Installation and Experience
Brian Butcher (top left), project engineer, Bob Laroy (top right), daytime supervisor, and Kyle Vanover (bottom left), EAF metallurgist, Steel Dynamics Inc., Flat Roll Div., Butler, Ind. (brian.butcher@steeldynamics.com, bob.laroy@steeldynamics.com, kyle.vanover@steeldynamics.com); Yury Krotov (bottom center), manager of technical services, Steel Dynamics Inc., Structural and Rail Div., Columbia City, Ind. (yury.krotov@steeldynamics.com); and Steve Meyer (bottom right), manager — proposals and projects, Superior Machine Co. of S.C. Inc., Florence, S.C. (smeyer@smco.net)
Two high-volume, twin-shell EAFs were upgraded at SDI Butler for increased furnace productivity. The design modifications are described in detail, along with the start-up experience, challenges, and operational and maintenance results. |
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Asymmetrical Power Control of AC EAFs by Structure-Borne Sound Evaluation
Björn Dittmer (top left), scientific assistant, and Klaus Krüger (top right), chair for process data processing and system analysis, Helmut-Schmidt-University Hamburg/University of the Federal Armed Forces Hamburg, Hamburg, Germany (bjoern.dittmer@hsu-hh.de, klaus.krueger@hsu-hh.de); Detlef Rieger (bottom left), project leader — technical consulting, non-destructive evaluation, Siemens AG, Corporate Technology, Munich, Germany (detlef.rieger@siemens.com); Thomas Matschullat (bottom right), head of process engineering, and Arno Döbbeler, Siemens AG, Industry Sector, Industry Solutions Division, Metals Technologies, Erlangen, Germany (thomas.matschullat@siemens.com, arno.doebbeler@siemens.com)
Structure-borne sound emissions of the furnace, the thermal loads of hot spots and other essential information can help determine the state of the meltdown process in an AC EAF. A new closed-loop power control system from Siemens AG results in improved power-on time, productivity and furnace wear. |
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EAF Optimization: Efficient Use of Energy in the Electric Arc Furnace
Allen Wyatt (top left), senior manager SGL PRO Americas, Hagen Fuchs (top right), global director commercial projects, David Kundrat (bottom left), SGL Professional Services, and Horst Schaefer (bottom right), senior manager SGL PRO Europe, NME, Africa, and Asia, SGL Group, The Carbon Co., Wiesbaden, Germany (allen.wyatt@sglcarbon.com, hagen.fuchs@sglcarbon.de, david.kundrat@sglcarbon.com, horst.schaefer@sglcarbon.de)
Careful analysis of heat data and controlled testing are necessary to define the optimum procedures for the use of oxygen and the production of chemical energy. Case studies in both Europe and North America reveal how analysis of heat and test data can result in cost savings. |
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Innovative Methods for Integrating Utility and Production Automation Systems
Michael E. Rourke, senior automation systems engineer, Schweitzer Engineering Laboratories Inc., Pullman, Wash. (michael_rourke@selinc.com)
This paper addresses the developments in electric power control and communications systems that provide for much greater integration with other plant control systems. Methods by which these technologies can lead to business and operational improvements are also discussed. |
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Strategies for Use of Superheated Steam as a Process Gas During Stainless Steel Refining
Carl-Johan Rick, manager — process engineering, Uvån Hagfors Teknologi AB, Täby, Sweden (carljohan.rick@uht.se)
This paper discusses why and when superheated steam is efficient during stainless steel refining. It is shown how steam decreases the argon consumption, the argon peak flow, and consequently changes alloy and scrap handling. |
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Formation of an Impromptu EAF Process Team at CMC Steel Texas
Bill VanderWaal (left), area manager — furnace and LMS, Sam Matson (center), technical energy manager, and John Jetkiewicz (right), SBQ manager, CMC Steel Texas, Seguin, Texas (bill.vanderwaal@cmc.com, sam.matson@cmc.com, john.jetkiewicz@cmc.com)
A unique team was formed at CMC Steel Texas to promote consistent performance from the EAF, improve efficiency and reduce the need for manual operating adjustments. This paper discusses the team members, the EAF equipment, the monitoring and measuring systems, and much more. |
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