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Abstract
The European COST programme has a long standing interest in the development of creep resistant 10%Cr steels for rotor forgings designed to operate at ≥600°C. The steel COST E is now widely used for steam turbine shafts, seeing a strongly rising market share, in addition to its applications in gas turbines. The fail–safe manufacturing procedure developed for COST E rotors at Saarschmiede is described; this procedure is backed up with an increasing amount of mechanical properties and long term data. More recently, the production of COST F steel rotor forgings for high/intermediate pressure turbines has commenced, with delivered weights up to 44 t. In an attempt to increase the permitted service temperature, the effect of boron additions has been investigated in a COST activity. Saarschmiede has produced full size trial rotors to develop a production procedure. These prototype components are now under testing and the production of boron containing 10%Cr steels has begun.