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The 9% Cr 1% Mo NbVN steel type known colloquially as steel 91 has become established as a candidate material for many high temperature applications.
Following a brief review of the history of the development of high strength 9 CrMo type steels, this project describes the metallurgical stability, tempering characteristics and elevated temperature strength of compositions related to steel 91. Seventeen compositions were studied. The metallurgical stability of this steel type is high in terms of prior austenite grain sizes with the grain coarsening temperature at about 1125 C and little risk of forming delta ferrite less than or equal to 1150 C. The presence of fine Nb(CN) particles is considered to be mainly responsible for the control of austenite grain size at normalizing temperatures in the range 1000 to 1200 C.

Additional information

Authors: ORR J, British Steel, Swinden Laboratories, Rotherham (GB);BURTON D, British Steel, Swinden Laboratories, Rotherham (GB)
Bibliographic Reference: EUR 15843 EN (1996) 81pp., FS, ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-827-7205-5; ISSN
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