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A new material for 700°C power plants

By Gerald Ondrey |

Together with E.ON AG (Düsseldorf; www.eon.com) and Hitachi Power Europe (Duisburg, Germany; www.hitachi-power.com), ThyssenKrupp VDM (Werdohl, all Germany; www.thyssenkruppvdm.com) has laboratory-developed a new material that, subject to successful testing, will represent a major step towards the construction of advanced 700°C power plants. This new technology could further improve the efficiency of coal-fired power plants while reducing carbon dioxide emissions. The efficiency of new power plants can be increased by raising the steam temperature in the boiler and turbine from 600°C (at a pressure of 250 bar) to around 700°C (350 bar) — a temperature that the materials currently used in power plant construction cannot withstand permanently. The nickel-based special steels developed by ThyssenKrupp VDM may therefore have a key role to play in the design of the power plant of the future. With this specific application in mind, the research laboratories of ThyssenKrupp VDM have taken an existing material and significantly enhanced its properties. “Alloy 617 B occ” (optimized chemical composition) — corresponding to Nicrofer 5520 occ at ThyssenKrupp VDM — offers high strength and ductility…
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