In this lecture the author reports on the progress made in the development and application of creep-resisting steels over the last 20 years, with particular reference to research carried out at The Brown-Firth Research Laboratories. The properties of the more established steels are reviewed, along with those of a number of newer steels introduced during this period. These include the 12 per cent chromium variants specially ‘tailor-made’ for aircraft gas turbine discs, two improved austenitic steels and two non-stainless types: a 6 per cent chromium complex steel, and a 2 per cent chromium molybdenum vanadium aluminium nitriding type. Cast austenitic pipe steels are also discussed. The author describes work being carried out with the object of improving the proof strength of austenitic steels, e.g. warm working and alloying with nitrogen. Some information is also presented in respect of the creep ductility properties of a number of the steels mentioned in the paper, with special reference to weld heat effects.
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