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October
2007
Vol. 4, No. 10
Process Metallurgy and Product Applications
About the Cover
At 1,125 feet, the Millau viaduct is the highest vehicular bridge in the world (slightly taller than the Eiffel Tower) and sets new records in technology at nearly 1.5 miles long. The bridge incorporates 62,300 tons of steel sourced from ArcelorMittal. 36,000 tons of steel was supplied to make the roadway and 4,600 tons of steel was needed to build the pylons. In addition, the cable stays, pillars and temporary pile work required 13,500 tons of circular reinforcing bar and 6,400 tons of steel tube. Not one work accident was recorded during the work on the site. Photo courtesy of ArcelorMittal.
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AIST Foundation Update
- 2007 - 2008 AIST Foundation Board of Trustees
- 2007 - 2008 AIST foundation Scholarship Winners
- 2007 FeMet Initiative Grant Winners
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41
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SeverCorr — A Unique Producer of Automotive Sheet Steels
Norman L. Samways, Ph.D., technical consultant, Pittsburgh, Pa.
SeverCorr is a 1.5 million ton/year greenfield flat rolled plant built to produce high-quality products, including cold rolled galvanized steel for exposed automotive applications. Details of the plant, along with plans for future expansion, are provided. |
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68
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Evolution of Artificially Induced Slab Imperfections Through Hot and Cold Rolling
Matthew J. Merwin, research specialist, United States Steel Corp. Research and Technology Center, Munhall, Pa. (mmerwin@uss.com); and Pavol Zahumensky, researcher, U. S. Steel Košice s.r.o. Research and Development, Košice, Slovakia (pavolzahumensky@sk.uss.com)
Artificial imperfections were applied to a continuously cast slab to observe the evolution of surface imperfections from the slab to coated strip. The information from this study can be used in identifying the origin of surface imperfections in sheet products. |
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Some Technological Aspects of the Thin Slab Casting Process at Very High Speeds
Nuredin Kapaj, executive manager — continuous casting processes, Fabio Vecchiet, scientific researcher, Milorad Pavlicevic, scientific director, and Alfredo Poloni, vice president, Danieli & C., R & D Centre, Buttrio, Italy (rnd@danieli.it); and Marcellino Fornasier (pictured), chief of slab casting process office, Danieli Wean United, Buttrio, Italy (m.fornasier@danieli.it)
This paper describes some of the main technological aspects that enabled a high casting speed at a pilot thin slab casting plant. The authors’ experience with dynamic bulging is presented, as well as countermeasures to help avoid it. |
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Development of Ultrathin Cast Strip Products by the CASTRIP® Process
Chris R. Killmore (top left), product design manager, Andrew Phillips (top right), product metallurgist, Harold Kaul (bottom left), senior product metallurgist, and Jim G. Williams (bottom center), manager — Metallurgical Technology Department, BlueScope Steel, Port Kembla, NSW, Australia (chris.killmore@bluescopesteel.com, andrew.phillips@bluesopesteel.com, harold.kaul@bluescopesteel.com, jim.williams@bluescopesteel.com); Heather Creely, Peter Campbell (bottom right), manager — Castrip sales and marketing, and Michael Schueren, Nucor Steel–Indiana, Crawfordsville, Ind. (hcreely@ns-ind.com; pcampbell@ns-ind.com; mschueren@ns-ind.com); and Walter Blejde, Castrip® LLC, Charlotte, N.C. (wblejde@castrip.com)
The main parameters that influence the final
microstructure and resultant mechanical properties of ultrathin cast strip products are discussed, particularly the effects of thermomechanical processing conditions. The development of various grades is described. |
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107
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Influence of Chemical Composition on the Microstructure and Mechanical Properties of Multiphase TRIP-assisted Steels Processed Using Thermal Cycles Compatible With Continuous Hot-dip Galvanizing
J.R. McDermid (left), associate professor, Dept. of Mechanical Engineering, McMaster University, Hamilton, Ont., Canada (mcdermid@mcmaster.ca); and Anne Mertens (right, formerly with the Dept. of Mechanical Engineering, McMaster University), student, Centre Européen d’Archéométrie, Université de Liège, Liège, Belgium (amertens@hotmail.com)
This article discusses recent studies on the effect of processing conditions compatible with continuous hot-dip galvanizing, namely a high bainitic hold temperature. The microstructure and mechanical properties of TRIP-assisted steels are the focus. |
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The Transformation and Strengthening Behavior of V-N Steels During Hot Strip Mill Simulation
C. Isaac Garcia, research professor, Ming Jian Hua, research assistant professor, and Anthony J. DeArdo, William Kepler Whiteford professor, Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pa. (garcia@engr.pitt.edu, mjhua@pitt.edu, deardo@engr.pitt.edu); Wen Gao, senior scientist, physical testing laboratory, Osram Sylvania, Towanda, Pa.; and R.J. Glodowski, director — technical services, Stratcor Inc., a subsidiary of Strategic Minerals Corp., Pittsburgh, Pa. (bob.glodowski@stratcor.com)
The transformation and strengthening behavior of a series of V-N steels during hot strip mill (HSM) simulation were investigated using various methods. Details of the results are discussed. |
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