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- W2460664918 abstract "Within the last few years all 1%CrMoV high temperature studs have been replaced on four of ESB`s large steam turbines because of a number of failure so the main casing studs due to creep embrittlement/reverse temper embrittlement. These 1%CrMoV studs were replaced with higher creep strength material AFNOR: Z20 CD NbV 11 (DIN: X19 CrMoVNb 11.1) i.e. 12%CrMoV. This material enters service with inherently lower toughness, in terms of fracture appearance transition temperature (FATT), than the 1%CrMoV steel. Recently, a limited amount of Charpy testing carried out on a 12%CrMoV main casing and stud removed from service after 30,000 hours revealed that the Charpy properties had dropped below the minimum values quoted for virgin material. This reduction in toughness may then explain the short term failures reported in the literature for similar components. Clearly the serviceability of the 12%CrMoV studs must be assessed to prevent in-service failures. The present paper initially reviews the fitness for service methodology established by ESB for the assessment of 1%CrMoV steels. This approach has been developed based on research to characterize the factors affecting service performance and utilization of special material tests to monitor time dependent changes in critical properties. Then the details of thismore » technology are discussed in relation to condition assessment of 12%CrMoV steel. Particular emphasis is given to investigation of the mechanism of embrittlement in the higher alloy material and consideration of the capability of miniature sample tests to accurately monitor material properties.« less" @default.
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- W2460664918 date "1995-12-01" @default.
- W2460664918 modified "2023-09-22" @default.
- W2460664918 title "Assessment of embrittlement in 12%CrMoV steel during elevated temperature service" @default.
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