Tokyo Steel which is one of biggest electrical furnace steel manufacture in Japan operates four production plants in Japan and is the country ́s number-one producer of H-beams. The portfolio includes a large number of long and flat products. The Okayama plant produces H-beams, I-beams, checkered beams, channels, rebar, hot rolled coils, checkered coils, pickled and oiled coils, hot-dip galvanised coils as well as steel sheets. Liquid steel production is based on the electric arc furnace route. The pickling line processes hot rolled coils with thicknesses between 1.5 and 6.0 mm in widths ranging from 840 to 1,340 mm.
Since demands for high standard steel of electric furnace steel is increasing due to the lower environmental impact of the EAF route, one important aspect of increasing production is an increase in pickling efficiency. The tension leveler type scale breaker will improve the processing of difficult-to-descale materials, in combination with Primetals ́ iBox (immersion box) pickling tank, which replaces an existing circulation type shallow-type pickling tank.
Some steel grades for demanding applications in the household appliances or automotive industry may require two or three times as long to descale in conventional pickling lines than normal low carbon steel, to reduce the productivity. The iBox with acid concentration control from Primetals was to address this issue, without the need for a circulation heating or jet pickling system, which achieves high descaling performance with lower consumption of energy and acid.
iBox is a registered trademark of Primetals Technologies, Ltd. in certain countries.
_{(Source: Primetals Technologies, Limited)}