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2009 October Issue
Vol. 6, No. 10 - Full Table of Contents
Process Metallurgy & Product Applications |
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About the Cover
By combining its materials, design engineering and manufacturing process
technology expertise, Corus helps automakers and their supply chain worldwide to deliver safer, cost-effective, lighter-weight vehicles that are fuel-efficient and
environmentally friendly. Corus is a major supplier of steel to Europe’s automotive industry. Photo supplied to Newscast by Corus.
Full magazine available in the Members Only Area |
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Technical Features Table of Contents |
| 47 |
Recent Developments With Ultrathin Cast Strip Products Produced by the Castrip® Process
Dan G. Edelman (top left), UCS development metallurgist, and Peter C. Campbell (top center), manager — Castrip sales and marketing, Nucor Steel–Indiana, Crawfordsville, Ind. (dan.edelman@nucor.com, peter.campbell@nucor.com); Chris R. Killmore (top right), product design manager, Kristin R. Carpenter (bottom left), product development metallurgist, Harold R. Kaul (bottom, second from left), senior product development metallurgist, and James G. Williams (bottom, second from right), manager — product technology, BlueScope Steel, Port Kembla, NSW, Australia (kristin.carpenter@bluescopesteel.com, chris.killmore@bluescopesteel.com, harold.kaul@bluescopesteel.com, jim.williams@bluescopesteel.com); and Walter N. Blejde (bottom right), director of technology, Castrip LLC, Charlotte, N.C. (wblejde@castrip.com)
Recent product developments at the Castrip® facility at Nucor’s Crawfordsville, Ind., plant have focused on expanding its range of light-gauge hot rolled products.
This paper presents an overview of these recent
product development experiences. |
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| 60 |
A Mechanism of Post-Rolling Deterioration in Hot Band Flatness During Coiling
E. Nikitenko (pictured), research specialist, U. S. Steel Research and Technology Center, Munhall, Pa. (enikitenko@uss.com), and B.C. Gris, development metallurgist, U. S. Steel Canada – Lake Erie Works, Nanticoke, Ont., Canada (bcgris@uss.com)
Flatness imperfections on heavy products rolled in a hot strip mill were analyzed, and a mechanism
explaining the phenomenon of post-rolling flatness
deterioration was proposed. Mill trials led to significant
improvements in flatness. |
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65 |
Development of High-Performance Steels for Bridge Applications at SSAB North America
D. Bai (top left), T. Nelson (top right), R. Bodnar (bottom left) and M. Cooke (bottom center), SSAB North America, Muscatine, Iowa (dengqi.bai@ssab.com, rick.bodnar@ssab.com, michael.cooke@ssab.com); and S. Scumpu (bottom right), SSAB North America, Toronto, Ont., Canada
This paper provides an overview of the development of SSAB NA’s production practices for TMCP HPS grade 50W and 70W plates. In addition to chemistry, plate microstructures and mechanical properties are presented. |
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75 |
Construction of a Web-Based Tutorial for 3-D Visualization of Ternary Phase Diagrams
Harvey Abramowitz (top left), Jun Ye (top center), Dongzhen Xu (top right), Erik Johnsen (bottom left), Tom Hagen (bottom left center), Weizhuo Zhao (bottom right center) and Michael Alden Roller (bottom right), Purdue University Calumet, Hammond, Ind. (harveya@calumet.purdue.edu)
A Web-based tutorial incorporating 3-D visualization is being developed to aid in the comprehension and use of ternary phase diagrams. This is a five-year project supported by FeMET. The results of the first two years of the project are reported. |
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| 86 |
U.S. Energy — A Perspective on Resources and Consumption
Dr. John Stubbles, steel industry consultant (john_stubbles@msn.com)
This paper attempts to quantify U.S. energy resources and consumption relative to the global picture, and present a balanced perspective on energy-related questions. Energy independence, conservation and green energy are among the topics discussed. |
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173 |
Magnesium Vapor Loss in Offgas of Hot Metal Desulfurization Process by Magnesium Injection
Haiping Sun, Yung-Chang Liu and Muh-Jung Lu, Steel & Aluminum Research & Development Department, China Steel Corp., Taiwan, ROC (h.sun@unsw.edu.au, scsrsc@mail.csc.com.tw)
The influence of magnesium vapor content in argon bubbles formed at the lance tip on the behavior of the bubbles rising in hot metal in the granulated magnesium injection process was investigated in this work. The physical and chemical behavior of argon bubbles and its relation to magnesium vapor loss in the offgas of the injection process were analyzed.
A larger fraction of magnesium vapor in a gas bubble dissolves into hot metal rather than reacting with sulfur or oxygen in hot metal when the vapor content in the initial gas bubble or magnesium content in hot metal is higher. The metal composition, particularly the magnesium content in hot metal, was found to be one of the key factors influencing magnesium vapor loss in the process offgas. In the initial stage of the magnesium injection process, the loss rate of magnesium vapor in the offgas is slow, but the loss rate is gradually intensified as sulfur is removed from, or magnesium is dissolved into, the hot metal. The loss rate of magnesium vapor in the process ofgas was also found to increase with increasing injecting gas flowrate.
The bubble size at the bath surface is reduced, and the splash of hot metal may be suppressed by using an evaporator at the lance tip. The overall kinetic conditions for gas-metal reactions are improved for a bubble of higher initial magnesium vapor content.
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