Development of 9Cr-1Mo steel reinforced with Nb, V, N, foruse at high temperatures

Project Information

Grant agreement ID: 7210-KF-304

Project closed

Start date 1 July 1988

End date 30 June 1991

Funded under

• Medium-term guidelines (ECSC) "technical steel research", 1986-1990

Total cost € 310 000,00

EU contribution € 186 000,00

Coordinated by

CREUSOT-LOIRE INDUSTRIE
France

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Publications

Other (1)

Development of a steel grade 9 Cr 1 Mo reinforced with V, Nb, N for use at high temperature

Author(s): CREUSOT-LOIRE INDUSTRIE (Creusot-Loire Industrie, Centre de Recherches des Matériaux du Creusot (FR))
Published in: EUR 14545 FR (1993) 74 pp., FS, ECU 9 (euroabstract 31/825), 1993, Page(s) 74, ISBN 92-826-5070-7

Exploitable results

Behaviour of a high temperature steel alloy

Research has been concentrated on T91 steels in the form of thick plates and on the behaviour of welds in hydrogen atmospheres. Acceptable properties were confirmed in plates up to 300 mm thick and the weldability was shown to be equivalent to that of 2.25 chromium1molybdenum steel which is the current standard. Weld toughness was high and resistance to hydrogen embrittlement was superior but the creep resistance of welded samples of T91 steel was inferior to the reference material. Therefore the T91 steel has the ability to withstand service temperatures up to 550 C compared with 450 C maximum for the lower alloy steel.