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August
2008
Vol. 5, No. 8
Flat Product Rolling & Finishing Technologies
About the Cover
A panel of leading steel industry executives recently took part in the AISTech 2008 Town Hall Forum. Pictured: (front row, left to right) Louis L. Schorsch, executive vice president, ArcelorMittal, and president and chief executive officer, ArcelorMittal Flat Americas; R. Joseph Stratman, executive vice president, Nucor Corp.; Joseph Curtin, president and chief operating officer, Tube City Div., Tube City IMS Corp.; (second row, left to right) John P. Surma, chairman, chief executive officer and president, United States Steel Corporation; John Callaway, Town Hall Forum moderator; George J. Koenig, president, Berry Metal Co., session chair; Keith E. Busse, chairman and chief executive officer, Steel Dynamics Inc.; (back row, left to right) Ronald E. Ashburn, AIST Executive Director; Mario Longhi, chief executive officer and president, Gerdau Ameristeel; and Russ Rinn, executive vice president, Commercial Metals Co., and president, CMC Americas. A summary of the Town Hall Forum begins on page 36. Cover photographer: Dave Rentz, Pittsburgh, Pa.
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59
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Hot Band Profile Irregularities Related to the Thermal Contour of Work RollsEugene Nikitenko, research specialist, United States Steel Corporation Research and Technology Center, Munhall, Pa. (enikitenko@uss.com)
Through simulations of the thermal conditions of work rolls in hot strip mill finishing stands, it was shown that the roll cooling pattern and the deviation from the mill centerline caused hot band profile irregularities. This paper reviews the experimental data that proves these findings.
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66
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Modification of Reheat Furnace Practices Through Comprehensive Process Modeling
ShaoJie Chen (left), research engineer, and Sunday Abraham (center), manager — research and development, Evraz Inc. NA (formerly SSAB IPSCO), Regina, Sask., Canada (schen@ipsco.com, sabraham@ipsco.com); and Drew Poshard (right), manager — rolling and finishing, SSAB IPSCO, Axis, Ala. (dposhard@ipsco.com)
Comprehensive modeling work was performed involving an FEA thermal stress model, an FDM slab temperature model, a furnace profile model, a slab dissolving temperature model and an optimization model. This paper outlines the model’s development, calibration and implementation.
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81
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Eco-Pickled Surface: An Environmentally Advantageous Alternative to Conventional Acid Pickling
Kevin Voges and Alan Mueth, The Material Works Ltd., Red Bud, Ill. (kevinv@thematwks.com); Brian Lehane, Metal Processing Technologies, Cambridge, Ont., Canada (wbl@mptech.com); and Stuart Critchley, Hatch Associates Ltd., Mississauga, Ont., Canada (scritchley@hatch.ca)
Eco-Pickled Surface is an environmentally advantageous method of removing the oxide layer formed during hot rolling of flat rolled steel. Development and testing of EPS technology has a number of advantages over dry-blasting or pickling methods of descaling steel strip.
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98
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Implementation of Surface Inspection Technology on Noisy Surfaces
Tara MacDougall (left), specialist — automation solutions technology, and Eva Dillon (right), metallurgy specialist — ASIS data support, ArcelorMittal Dofasco Inc., Hamilton, Ont., Canada (tara.macdougall@arcelormittal.com, eva.dillon@arcelormittal.com)
Surfaces with low background noise and relatively few defects are ideal for the implementation of surface inspection technology. This paper discusses the application of the latest technology on noisy (pickled) surfaces and methods to improve data integrity.
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107
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On-line Roughness Measurement in a Coil Line
Wolfgang Bilstein (left), Amepa GmbH, Aachen, Germany (wolfgang.bilstein@amepa.de), and Kevin Bertermann (right), Amepa America Inc., Middleburgh Heights, Ohio (bertermann@amepa.com)
Based on a development by the Centre for Research in Metallurgy, a new system for surface roughness
measurement for steel strip production is presented. This paper illustrates the laboratory results and experiences of the industrial application in Gent, Belgium.
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114
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Non-Woven Rolls for Fluid and Strip Control
Eric G. Almquist, Star Tool & Die Works Inc., Chicago Heights, Ill. (ealmquist@startoolanddie.com)
This article explains the fundamentals, strengths and weaknesses of non-woven process rolls. Technical facts regarding this technology, along with a common understanding of the reality of non-woven rolls, are provided.
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215
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Modeling of Scrap Melting in the Heel of an EAF
J. Li, research engineer, AK Steel Research, Middletown, Ohio (jianghua_li@aksteel.com); N. Provatas, professor of materials science and engineering, and G.A. Irons, director, Steel Research Centre, Department of Materials Science and Engineering, McMaster University, Hamilton, Ont., Canada (provata@mcmaster.ca, ironsga@mcmaster.ca)
The operational problem of late-stage melting of scrap in an electric arc furnace is addressed. A phase field–type model is formulated to examine the effect of scrap packing density, size, preheat and stirring conditions on scrap melting time in the liquid pool. Heat transfer modeling examines the problem of stable thermal stratification of furnaces heated from the top and its detrimental effect on scrap melting efficiency. The beneficial effects of stirring from bottom plugs are demonstrated, and the implications are discussed. |
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