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Siemens Receives Order from Posco E&C for Supply of New Steel Mill at Posco Pohang Works, Korea
Posco, one of the largest steel manufacturers in the world, produced more than 30 million tons of steel in 2007. In response to the continually growing local and international demand for steel, Posco commissioned Posco E&C to install a new steel mill adjacent to its existing steel works in Pohang. Siemens Metals Technologies will provide engineering and key equipment and systems for two 300-ton-nominal-capacity LD (BOF) converters, including the offgas-treatment systems, a twin-station RH (Ruhrstahl-Heraeus) degassing plant - each station will be capable of degassing up to 345 tons of steel per treatment cycle - two ladle furnaces with the same capacity in addition to auxiliary facilities and systems.
Both converters will be equipped with the maintenance-free VAI-Con Link suspension system, a converter-tilting unit with drive, and a dry-type converter-offgas-treatment system which will cool and dedust up to 200,000 m3 of offgas per hour. Additionally, an evaporation cooler, a Siemens VAI four-field, round-type ESP (electrostatic precipitator), an ID (induced draught) fan and a gas-switchover station - for directing the treated converter offgas to either the flare or to intermediate storage in a gasholder for subsequent heating applications or for the generation of electricity - will be supplied. The offgas-treatment plant features a unique plate-type cooling system which ensures a high cooling efficiency of the exhausted air by the secondary dedusting system during converter charging.
Dephosphorization and conventional decarburization of the hot metal will be possible in both converters. A low phosphor content of the rolled steel plates used in pipelines is a prerequisite for avoiding cracks - especially important in regions where low winter temperatures prevail. The RH degassing plant will ensure a low hydrogen and nitrogen gas content of the liquid steel as required for the production of high-quality plates. In the ladle furnaces argon purging will be carried out to obtain a high degree of steel homogeneity and also to enable final temperature adjustments to be made prior to continuous casting.
This project represents the continuation of the successful cooperation between Posco and Siemens VAI. This is now the fifth converter project since 2000 that the two companies will be jointly implementing in the steelmaking sector.
Additional information on solutions for steel works, rolling mills and processing lines is available at http://www.siemens.com/metals.
VAI-Con is a registered trademark of Siemens AG in certain countries.
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