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Optimising thermomechanical processing with reduced energy demand
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Improving the steel properties and production processes with reduced energy demand for high strength steels requires improved process control in close relation to the steel composition. Hot rolling of steel is an energy-intensive process, especially in respect of preheating the steel slabs. The present work was carried out with the aim of reducing the initial slab temperature while at the same time improving properties by optimization of the steel composition and process parameters. Optimization of slab reheating and hot rolling parameters in connection with plate and strip rolling was carried out on low C-Mn high-strength steels microalloyed with Mo-Ti-Nb-B, both in laboratory and full scales processing. The effects of a low slab reheating temperature, high finish rolling temperature (FRT) during thermo-mechanical controlled processing (TMCP) and accelerated cooling rates following hot rolling to RT or to the coiling temperature have been investigated. Improvement of yield strength of the plate has been obtained by lowering the slab reheating temperature, especially with high cooling rates (>20°C/s) to room temperature. The results obtained for strip steels also show that a reduced reheating temperature combined with high finish rolling temperatures and cooling rates (>20°C/s) to a coiling temperature of 450°C produces very positive microstructures and mechanical properties in the present steels. Lowering the slab reheat temperature reduces energy consumption and accordingly releases less CO 2 into the atmosphere during the thermo-mechanical processing of the present steels. © 2012 Trans Tech Publications, Switzerland.

Place, publisher, year, edition, pages
2012. Vol. 706-709, 2818-2823 p.
Series
Materials Science Forum, ISSN 0255-5476
Keyword [en]
Cooling, Energy, Environment, High strength steel, Hot rolling, Mechanical properties, Microalloying, Microstructure, Plate, Strip
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12947DOI: 10.4028/www.scientific.net/MSF.706-709.2818ISBN: 9783037853030 (print)OAI: oai:DiVA.org:ri-12947DiVA: diva2:973140
Conference
7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011, Quebec City, QC, 1 August 2011 through 5 August 2011, 88200
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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Swerea KIMAB
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