| 摘要 |
The invention relates to a ferritic steel that is particularly creep-resistant at temperatures from 600 to 1000°C and contains precipitations of an intermetallic phase Fe2 (M, Si) and/or Fe7 (M, Si), where M is a metal, in particular niobium, molybdenum, tungsten and/or tantalum. The precipitations may be formed during its production, during a heat treatment or during use at high temperature. The metal is partially substituted by silicon. As a result, it is possible to introduce considerably more creep-resistance enhancing precipitations into the steel than on the basis of the prior art, without thereby impairing the oxidation resistance of the material. If the alloy additionally contains chromium, the steel can be made into a chromium-oxide forming steel, which can be used inter alia for the bipolar plate in a stack of high-temperature fuel cells. The bipolar plate can be designed in such a way that its oxidic surface layer has good electrical conductivity and low chromium evaporation. |
