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Coraopolis, PA, United States

Memoli F.,Tenova Core | Guzzon M.,Iron and Steel Division | Giavani C.,Iron and Steel Division
Iron and Steel Technology | Year: 2012

In recent years, the development of Consteel® technology has focused on the preheating function, in order to accomplish the energy savings and environmental requirements of Western countries. This paper describes why the hot heel is a fundamental pillar of the Consteel process, providing process details and technological peculiarities. Source


Fantuzzi M.,Tenova Italimpianti | Kaufman J.,Tenova Core
MPT Metallurgical Plant and Technology International | Year: 2013

Regenerative flameless burners developed by Tenova are installed in the new walking beam furnace at California Steel Industries' facility in Fontana, CA, US. California Steel Industries, Inc. produces hot rolled, cold rolled, pickled and oiled, and galvanized steel products and electric resistance welded pipe. The manufacturing process begins in the hot strip mill, where thick steel slabs are heated in large furnaces and then hot rolled to produce steel coils. The challenge that Tenova Core faced was to select the most suitable combustion technology for this scenario. The furnace is top- and bottom-fired. It is end-charged by means of a charging machine and end-discharged by an extractor. The furnace material handling system includes roller tables in front of the furnace. A waste heat boiler is used to recover some of the available heat from the waste gases after passing through the recuperator and before passing into the stack. Source


Memoli F.,Tenova Core | Guzzon M.,Tenova SpA | Giavani C.,Tenova SpA | Zanforlin M.,ORI Martin Spa | Galbiati P.,Tenaris Group
Iron and Steel Technology | Year: 2010

Besides the expected reduction of production costs and increase of productivity, the Consteel® EAF in its 20 years of development has brought to EAF steelmaking many other benefits and improvements. This paper analyzes the reduction of nitrogen pickup and the increase of metallic yield that can be achieved trough the standard melting practice typical of the Consteel EAF: the continuous scrap feeding and foamy slag during the entire power-on time. Since the electric arc is covered for the entire melting process, there is an important reduction of the nitrogen content in the liquid steel. Of course, there are other main factors that may influence the N2 pickup, and all of them are analyzed in this paper. An additional benefit that characterizes the Consteel EAF process is the possibility to achieve, with the same scrap mix, a higher metallic yield. This is due to the peculiarity of the melting process and the correct man-agement of the oxygen injection that can be optimized for the flat bath process of the Consteel, so the lances and injectors typically use the nominal flow-rate, and then the efficiency in carbon removal is maximized and the iron oxidation can be minimized. Results of Consteel operations in different countries are given in this paper, and data are compared in order to confirm the mentioned benefits. Source


Schliephake H.,Georgsmarienhutte GmbH | Born C.,Tenova Re Energy GmbH | Granderath R.,Tenova Re Energy GmbH | Memoli F.,Tenova Core | Simmons J.,Tenova Core
Iron and Steel Technology | Year: 2011

Georgsmarienhütte GmbH (GMH), Germany, operating at 140 t/h DC EAF initiated a project to replace the cooling system after almost 25 years of continuous operation, including the time it was used for the BOF. The steam production is the best operating practice for flexible heat recovery as the steam can be used for many purposes, relatively easy to transport, and water an inexpensive and non-toxic base. The technology used to turn waste gas energy into steam is Tenova iRecovery. An iRecovery waste gas duct is a tube-tube construction that looks very similar to a conventional cooling duct. An iRecovery system is designed for partial evaporation of the water, typically no more than 5-12% will be evaporated under normal operation conditions, which ensures that there is spare capacity in the cooling system. An iRecovery waste gas ducts work with radiation heat transfer, which is efficient down to approximately 600°C. Source


Hurd G.R.,Tenova Core | Kaufman J.,Tenova Core | Wu H.C.,Gerdau Long Steel North America | Ward J.,Tenova Core | Rodriguez E.,Adaptive Resources
Iron and Steel Technology | Year: 2011

An advanced reheat furnace level 2 control system can provide significant quality and efficiency improvements over conventional level 2 systems. This work presents a description of recent developments in reheat furnace automation technological advancements and discusses the operational results. Source

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