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An increase in the operating temperature and pressure of a steam power plant leads to an increase in the system efficiency. Although the use of austenitic steels would permit such an increase these materials suffer from the disadvantage of high price and susceptibility to thermal fatigue, caused by the higher coefficient of thermal expansion and low thermal conductivity. For this reason improved ferritic steels were required to minimise turbine and boiler costs and provide high flexibility of operation (2 shift operation, frequent start-up/shut down). Such steels are also the subject of extensive research programmes in Japan and the USA.
The long-term aim of the COST programme was to develop and evaluate improved creep resistant 9 to 12% Cr steels and to manufacture, test and seek service operation of critical components required for an advanced steam power plant (steam temperature of 600 C and at supercritical pressure). The development goals in terms of required materials properties, fabrication techniques (forging, casting, welding) and nondestructive examination had been defined by the turbine and boiler manufacturers.Within the programme alloy development work was firstly performed on small batches of material, some of which had been begun within the first round of COST 501. Subsequently for the best steels representative components were manufactured to demonstrate the feasibility of up-scaling. These components were subjected to nondestructive and destructive testing.
Steels were developed which were able to satisfy the targets set for large components, so that steam power plant can now be built with operating temperatures up to 600 C. .

Additional information

Authors: MAYER K H, MAN Energy, Nuremburg (DE);BERGER C, Siemens Power Generation KWU, Mülheim (DE);SCARLIN R B, ABB Power Generation Ltd, Baden (DE)
Bibliographic Reference: EUR 16858 EN (1996) 133pp., FS
Availability: Available from COST Programme Office, European Commission, 200 rue de la Loi, B-1049 Bruxelles (BE)
ISBN: ISBN 92-827-6578-4
Record Number: 199610832 / Last updated on: 1996-08-30
Original language: en
Available languages: en
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