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July
2007
Vol. 4, No. 7
Continuous Casting Technologies
About the Cover
The slab caster at Anyang Iron & Steel Co., P.R. China, as supplied by SMS Demag, produces slabs up to 3,250 mm wide and 150 mm thick at a maximum casting speed of 2 m/minute. The caster produces slabs in a wide range of steel grades, including plate, tube, pipe, structural and construction steels. Photo courtesy of SMS Demag
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President’s Award Breakfast Keynote Address
Out of the Ashes: The 21st Century Transformation of the American Steel Industry
Keith E. Busse, chairman and chief executive officer, Steel Dynamics Inc.
AIST President Richard P. Teets Jr. presented Keith E. Busse with the 2007 AIST William T. Hogan, S.J. Lecture Award in appreciation for his keynote lecture presented before a sold-out crowd of 1,050 people at the AISTech 2007 President’s Award Breakfast in Indianapolis, Ind.
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2007 Howe Memorial Lecture:
From Liquid to Solid: Key Issues in the Future of Steel Casting
Alan Cramb, Clark and Crossan Professor of Engineering, Dean of Engineering, Rensselaer Polytechnic Institute, Troy, N.Y. (cramb@rpi.edu)
A major issue of modern casting is to create defect-free cast surfaces at very high casting speeds. This lecture focuses on the current status and the future of continuous casting by considering how solidification starts and how quickly a solid can form.
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76
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Improvements at Mittal Steel Sparrows Point in Tundish Draining Through Direct Bath Height Measurement
Richard E. Fash (left), division manager — steel producing, and George Moulden (center), area manager — continuous casting, Mittal Steel USA – Sparrows Point, Baltimore, Md. (rick.fash@mittalsteel.com, george.moulden@mittalsteel.com); and Kevin J. Bertermann (right), president, AMEPA America Inc., Cleveland, Ohio (bertermann@amepa.com)
Mittal Steel Sparrows Point installed an electromagnetic-based sensor in the tundish refractory, allowing direct measurement of bath height. The measurement system, trial data, caster practice changes and process improvements are discussed.
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Mechanism of Hook Formation in Ultralow-carbon SteelBased on Microscopy Analysis and Thermal-stress Modeling
Joydeep Sengupta (top left), research leader, Dofasco Inc., Hamilton, Ont., Canada (joydeep_sengupta@dofasco.ca); Brian G. Thomas (top right), Wilkins professor, University of Illinois at Urbana-Champaign, Urbana, Ill. (bgthomas@uiuc.edu); Ho-Jung Shin (bottom left), researcher, POSCO Technical Research Laboratories, Gwangyang, South Korea (ceraby@posco.com); and Seon-Hyo Kim (bottom right), professor, Pohang University of Science and Technology, Pohang, South Korea (seonhyo@postech.ac.kr)
A new mechanism for the formation of hooks and oscillations marks during continuous casting of ultralow-carbon steels is presented. Previous experimental observations, plant data and theoretical modeling results are also considered.
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96
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The Development of a New Approach to Deoxidation at Nucor Steel–Arkansas
P.K. Ghosh (left), formerly of Nucor Steel–Arkansas, Hickman, Ark. (pradipghosh@hotmail.com); Robert R. Rote (center), vice president — technology, and Thomas W. Junker (right), director of engineering, MINCO – Midwest Instrument Co. Inc., Hartland, Wis. (rrote@minco.net, tjunker@minco.net)
This paper discusses the development of an empirical relationship between the amount of aluminum to be added at the LMF and the oxygen measurement at the EAF based on various factors.
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105
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Strand Surface Cracks — The Role of Abnormally Large Prior-austenite Grains
Rian Dippenaar (left), professor of casting and steelmaking, University of Wollongong, Wollongong, Australia (rian@uow.edu.au); Suk-Chun Moon (center), casting manager — Minimill Dept., POSCO Gwangyang Works, Jeonnam, South Korea (msc9241@posco.co.kr); and Edward S. Szekeres (right), principal consultant, Casting Consultants Inc., Rochester, N.Y. (casting@fes-net.com)
Excessive grain growth is a probable prerequisite for transverse cracking during unbending of continuously cast strands. Crack formation when grain diameters are greater than 1 mm is reviewed, and experiments to evaluate the problem are described.
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The Latest Continuous Casting Design for Increased Production, Extended Product Mix and Optimum Quality
Christian Geerkens, Jens Kempken, Joseph Dzierzawski, Martin Becker and Ulrich Kerp, SMS Demag AG, Düsseldorf, Germany (christian.geerkens@sms-demag.com, jens-kempken@sms-demag.com, joseph.dzierzawski@sms-demag.com, martin.becker@sms-demag.com, ulrich.kerp@sms-demag.com)
ntelligent Slab Casting technology encompasses segment design, control, hydraulics and automation for outstanding slab quality and productivity. The implementation of this technology in the Salzgitter Flachstahl No. 3 continuous caster is described.
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