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Scale Formation on 430 SS in a Simulated Slab Comb. Reheat

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Tuesday, November 10, 2020
Jessica Mortimer,jmortimer@aist.org or +1.724.814.3070

AIST Webinar: 12:00 PM ET -1:00 PM ET

Scale formed during slab reheating can be difficult to remove by high-pressure descaling, having a negative impact hot roll surface quality. A large-capacity thermogravimetric apparatus that replicates the combustion atmosphere and temperature in a slab reheat furnace was used to investigate scale formation on 430 stainless steel. Effects of reheating parameters (temperature, time and atmosphere) on oxidation kinetics were investigated. Oxidized samples were characterized by scanning electron microscopy, Raman spectroscopy and x-ray diffraction to document the microstructure and morphology of scale. Mechanisms for the formation of multi-layered oxide structures that complicate oxidation kinetics and scale removal are discussed.

Dr. Simon N. Lekakh
Professor
Missouri University of Science & Technology
Simon Lekakh is a professor at Missouri University of Science and Technology. He received his Ph.D. in metal casting from Belarussian Polytechnic Institute and doctor of science from Moscow Institute Steel and Alloys. His research fields include metallurgical processes: experimental, computing, industrial applications. He has published three books and 200+ articles and is the author of two U.S. patents. He has received the AIST Richard Fruehan Award and seven American Foundry Society awards for best conference papers.
Dr. Ronald J. O'Malley
F. Kenneth Iverson Endowed Chair Professor & PSMRC Director
Missouri University of Science & Technology
Ronald J. O'Malley received B.S. and M.S. degrees in materials engineering from Drexel University in 1978 and a Ph.D. in metallurgy from the Massachusetts Institute of Technology in 1983. In 1984, he joined Alcoa's research center to work on casting and refining technologies in aluminum. In 1988, he joined Armco Inc.'s Technology Center in Middletown, Ohio, USA, which later became part of AK Steel, where he conducted steelmaking and casting research and development for a diverse mix of flat-rolled specialty steels, including developments in the thin-slab casting of stainless steels at AK Steel - Mansfield Works. He later served as chief metallurgist at Nucor Steel-Decatur LLC, where he was responsible for metallurgical development and for steelmaking and casting process support within Nucor. He now serves as the F. Kenneth Iverson Chair Professor in Steelmaking Technologies and director of the Kent D. Peaslee Steelmaking Manufacturing Research Center at the Missouri University of Science and Technology. O'Malley has published numerous papers in the fields of continuous casting and steel processing, has taught numerous short courses on the continuous casting of carbon and specialty steels, received the Charles H. Herty Jr. Award in 1999, was awarded AIST Distinguished Member and Fellow in 2012, and received AIST Presidential Citations in 2010 and 2013. He served as the Conference Planning Committee chair for AISTech 2013, papers chair for the Continuous Casting Technology Committee (CCTC) for AISTech 2012, representative on the Material Advantage Committee for 2013, and is a lecturer for AIST Continuous Casting - A Practical Training Seminar and The Making, Shaping and Treating of Steel: 101. He has previously served on the AIST board of directors as a representative for the CCTC and the Ladle & Secondary Refining Technology Committee. He has also served on the selection committee for the FeMET and StEEL student scholarships and the selection committee for the Elliott Lectureship Award.

Richard Osei
Missouri University of Science and Technologyy
Richard Osei is a Ph.D. student at Missouri University of Science and Technology. He received a B.S. degree in minerals engineering at University of Mines and Technology in Ghana. His research interest include oxidation and descaling in steels, gold extractive metallurgy, small-scale mining and microbial mineral recovery. Osei has published five articles.

AIST's Hot Sheet Rolling Technology Committee.




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