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Tassot P.,Calderys Deutschland GmbH and Co. OHG
Stahl und Eisen | Year: 2011

Danieli is proud of the results achieved by their worldwide customers, to which the company has contributed its technologies, quality equipment manufacturing, and on-site-construction. One of the technologies is the evaporative cooling of the electric arc furnace (EAF) fume treatment plant which is efficient and recovers waste heat, with consequent fuel saving and reduction of greenhouse gas emissions. The traditional cooling system transfers part of the sensible heat contained in the fumes, which is generally lost in the water cooling plant, to the cooling water. The components of the plant that are traditionally water-cooled with a pipe-to-pipe design (fume ducts and post-combustion chamber) can be built to resist an internal pipe pressure much greater than the atmospheric one, in order to be cooled by water evaporation. A single, 420-t total capacity twin DC, ultra-high power EAF equipped with the Consteel system has been successfully started up in June 2010 at the Tokyo Steel Tahara Plant in Japan. Source


Tassot P.,Calderys Deutschland GmbH and Co. OHG | Reichert N.,Calderys Deutschland GmbH and Co. OHG
Revue de Metallurgie. Cahiers D'Informations Techniques | Year: 2010

The role of the tundish in the continuous casting process has evolved from that of a buffer between the ladle and mold to being a grade separator, an inclusion removal device and a metallurgical reactor. For both grade separation and inclusion removal, the flow patterns inside the tundish play an important role. The separation of non-metallic inclusions at the interface between the steel and the slag in the tundish is to a great extent controlled by interfacial phenomena in the steel-slag-inclusion system. One constant in the world of high-purity, low-residual and clean steels is the continual drive to reduce and control the frequency of the inclusions. For example, there are high-purity, low-residual clean steels such as IF-steel sheets for automobiles which require the absence of oxide inclusions with diameters larger than 100 micrometers. Great efforts have been made to optimize the flow and turbulence in the tundish through weirs, dams or other systems. Furthermore, a new system, the porous annular well block for injecting argon, has been developed to optimize the bubble size and distribution and hence to achieve a high efficiency in trapping inclusions and in decreasing the hydrogen content in steel. Consequently, the steel quality is further improved in the tundish. Tested with success in a seamless steel shop, the new system gives results in agreement with the water models. © EDP Sciences. Source


Tassot P.,Calderys Deutschland GmbH and Co. OHG | Reichert N.,Calderys Deutschland GmbH and Co. OHG | Willoughby C.,Calderys Deutschland GmbH and Co. OHG | Turrel C.,Calderys Corporate
Stahl und Eisen | Year: 2012

The role of the tundish in the continuous casting process has evolved to this as a metallurgical reactor. For both, grade separation and inclusion removal, the flow patterns inside the tundish play an important role. One constant in the world of high purity, low residual and clean steels is the continual drive to reduce and control the source, frequency and size of the inclusions. Recently, a new system, the porous annular well block for injecting argon, has been developed to achieve a high efficiency in floating out larger inclusions and decreasing the hydrogen and nitrogen content in the steel. Source

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