Sustainability report

L'any 2006 Mittal Steel compra Arcelor i a partir de 2007 s'anomena ArcelorMitta

Annual report

L'any 2006 Mittal Steel compra Arcelor i a partir de 2007 s'anomena ArcelorMitta

IPC2008-64295 RECENT DEVELOPMENTS OF HIGH STRENGTH LINEPIPE STEELS ON COIL

ABSTRACT The present paper deals with the recent steel development for linepipe applications at ArcelorMittal. With the recent upgrade of the downcoiler capabilities in three European steel plants it is now possible to supply hot rolled coils in width up to 2150mm for the economical production of X70 large diameter, spiral welded transmission trunk lines with 25.4mm wall thickness. In view of the increased dimensional feasibility range a couple of new product development projects had been launched. Two of these products with very demanding application properties are already being industrialized. It concerns respectively X70 in 22mm thickness with improved low temperature BDWTT properties (85% shear area at -10°C) and X80 in 16mm, likewise with low temperature BDWTT properties and, additionally, with low Y/T ratio. The first preseries deliveries have been successfully transformed to pipes in one of our client's spiral welded pipe mill. Another product development project which is still in the conception phase concerns the development of X100 in thickness up to 12.7mm. The actual progress of the mentioned projects will be documented here. Key for the realization of such demanding products is a precise control of the final microstructure. This is in particular true for high strength steels with improved toughness. Therefore, a lot of research efforts were spent in order to understand the link between microstructures and properties. Our current understanding will be detailed in this paper

Indiana Harbor Works

aerial view, Iron processing plant at the Indiana Harbor Works, 8/21/2010Sparrows Point, MD 2021

Indiana Harbor Works

aerial view, molten steel run off from the Indiana Harbor Works, owned by ArcelorMittal, 8/21/2010Sparrows Point, MD 2021

Indiana Harbor Works

aerial view, processing plant at Indiana Harbor Works, owned by ArcelorMittal, 8/21/2010Sparrows Point, MD 2021

Indiana Harbor Works

aerial view, processing plant at the Indiana Harbor Works, 8/21/2010Sparrows Point, MD 2021

Indiana Harbor Works

aerial view, steel mill processing iron ore at the Indiana Harbor Works, 8/21/2010Sparrows Point, MD 2021

Indiana Harbor Works

aerial view, piles of material at Indiana Harbor Works, owned by ArcelorMittal, on the Lake Michigan coast, 8/21/2010Sparrows Point, MD 2021