Title

THE 420 TON TWIN DC, JUMBO SIZE FASTARC® AT TOKYO STEEL – JAPAN

THE 420 TON TWIN DC, JUMBO SIZE FASTARC® AT TOKYO STEEL – JAPAN

Authorship

Ogawa, Tokuo; Sellan, Romano; Ruscio, Enzo

Ogawa, Tokuo

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Sellan, Romano

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Ruscio, Enzo

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DOI

10.5151/2594-5300-18236

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Abstract

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. The Jumbo Size EAF is the largest ever built and is designed to achieve a yearly productivity of 2.6 Mt/yr, with 360 t/h: this EAF has extreme efficiency in terms of operating costs due to low manpower and low energy demands. The construction of a single, high capacity EAF (tapped size 300 t) is in line with the steelmaking trend of last years: meltshop sizes are increasing to reach higher productivities and efficiencies, with limited investment in order not to affect margins with high fixed and variable costs. The most advanced technologies have been employed, due to relevancy of the main issues related to fast process in large size EAF: ultra high power supply, which is particularly critical in this case because of the weak network available, and high efficiency of metallurgical processes, needed to achieve constant steel quality in a short tap to tap. The plant also includes secondary metallurgy equipment for the production of high quality steel (low and ultra low carbon for hot rolled coils) and a powerful fume treatment plant.

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. The Jumbo Size EAF is the largest ever built and is designed to achieve a yearly productivity of 2.6 Mt/yr, with 360 t/h: this EAF has extreme efficiency in terms of operating costs due to low manpower and low energy demands. The construction of a single, high capacity EAF (tapped size 300 t) is in line with the steelmaking trend of last years: meltshop sizes are increasing to reach higher productivities and efficiencies, with limited investment in order not to affect margins with high fixed and variable costs. The most advanced technologies have been employed, due to relevancy of the main issues related to fast process in large size EAF: ultra high power supply, which is particularly critical in this case because of the weak network available, and high efficiency of metallurgical processes, needed to achieve constant steel quality in a short tap to tap. The plant also includes secondary metallurgy equipment for the production of high quality steel (low and ultra low carbon for hot rolled coils) and a powerful fume treatment plant.

Keywords

Electric arc furnace; DC; Twin electrodes.

Electric arc furnace; DC; Twin electrodes.