High strength non-magnetic alloy

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

148/33, 75/98

C21D 8/00 (2006.01) C22C 30/00 (2006.01) C22C 38/08 (2006.01) C22C 38/50 (2006.01) C22C 38/54 (2006.01)

Patent

CA 2004336

This invention relates to corrosion resistant, austenitic, non-magnetic alloys. The alloys contain by weight about 32 to 38% nickel, about 3 to 7% chromium, about 3 to 5% titanium, about 0.3 to 1.5% aluminum, about 0.5 to 1.5% molybdenum, an effective amount of vanadium, about 0.005 to 0.02% boron, up to about 0.02% carbon, and the balance substantially iron. The alloys are controlled temperature hot rolled and age annealed to provide strain hardening and precipitation strengthening to achieve yield strength objectives established for retaining rings in new high capacity generators. Yield strengths of at least about 200 ksi can be produced by the alloys of this invention making them suitable for use in new high capacity generators.

Alliages austénitiques et non magnétiques résistant à la corrosion. Les alliages renferment environ 32 à 38 % de nickel en poids, environ 3 à 7 % de chrome, environ 3 à 5 % de titane, environ 0,3 à 1,5 % d'aluminium, environ 0,5 à 1,5 % de molybdène, une quantité respectable de vanadium, environ 0,005 à 0,02 % de bore, jusqu'à environ 0,02 % de carbone et le reste est principalement constitué de fer. La température des alliages est surveillée lors du laminage à chaud et du recuit par vieillissement dans le but de leur conférer un durcissement par écrouissage et un renforcement par précipitation qui conviennent aux objectifs de ténacité visés pour les bagues de retenue des nouvelles génératrices à haute capacité. La ténacité des alliages destinés aux nouvelles génératrices à haute capacité doit être au moins d'environ 200 ksi.

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