BCT® -Belt Casting Technology is the new horizontal near-net-shape casting process to produce flat steel products. BCT is the revolutionary leap in casting technology, designed for the production of special and conventional steel grades. Within a partnership between Salzgitter Flachstahl GmbH and SMS Siemag AG, the worldwide first caster is now in operation. SMS Siemag AG (in cooperation with Salzgitter Flachstahl GmbH) has erected the first industrial-scale casting machine located at Peine steelworks. The lecture will start with an overview about the highlights of the BCT® process with regard to the mechanical engineering aspects, while the second part will present current commissioning results and operation experiences. Since December 2012, the BCT plant is running. Up to March 2015 more than 90 casts have been carried out, 26 with FeMn-alloys. Never before flat steel was casted in dimensions of 1000 mm * 15 mm and with casting speeds more than 14 m/min.
The industrial production of high manganese steel melts with approx. 10-30 wt% Mn makes high demands on the utilized Mn-bearing alloying agents in terms of chemical composition and cost-efficiency. Conventional Mn-bearing alloying agents are reviewed in this regard. A modified process route has been conceived for pyrometallurgical winning of special silicomanganese grades tailored for high manganese steelmaking. For each individual process step, namely manganese slag production, silicomanganese production, and optional desiliconization of silicomanganese, results of lab-scale experiments are discussed.
Aktuelle Trends in der Automobilindustrie in Richtung Sicherheit, Kraftstoffeinsparung und Minderung von Abgasen führen zu einem vermehrten Einsatz von hoch‐ und höherfesten Stahlwerkstoffen im Karosseriebau. Durch die höherfesten Stähle lassen sich die verwendeten Blechdicken bei gleicher Belastung zum Teil deutlich reduzieren. Die Umformung dieser Werkstoffe stellt jedoch auch erhöhte Anforderungen an den Tiefziehprozess. Ursache hierfür ist die erhöhte Neigung zur Rückfederung der Blechteile aus diesem Werkstoffspektrum. Neben der Rückfederung spielt der Beulwiderstand insbesondere bei Außenhautteilen eine entscheidende Rolle. Eine der Haupteinflussgrößen auf dieses elastisch‐plastische Werkstoffverhalten ist der Elastizitätsmodul, der daher im Rahmen dieses Aufsatzes näher untersucht werden soll.
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