A newly developed alloy 945X has nominal composition of Fe-53.5Ni-20.5Cr-3Mo-2Cu-4Nb-1.5Ti. The alloy provides 140 ksi (965 MPa) minimum yield strength with an excellent combination of ductility and impact strength in the solution treated and aged condition. Alloy 945X is incorporated in NACE MR0175 / ISO 15156 -3 for level VII and level VI at 450°F (232C°).

This paper covers alloy 945X capabilities for mechanical properties and microstructure. Results are presented on slow strain rate testing (SSRT) on a range of yield strengths and dimensions for rod product. Mechanical properties and corrosion resistance of mechanical tubes are also presented. This data on SSRT is compared with other high strength alloys. In addition, SSRT data and C-ring data of precipitation strengthened alloys is compared in the same environmental conditions.

Subject
Test methods, Materials, Precipitation (solids), Corrosion resistant alloys, Nickel based alloys, Tubes, Rods, Mechanical properties, Commercial alloys, Elongation, Alloys, Yield strength, Slow strain rate technique
Keywords:
Ni-based, Alloy 945X, sour environments, precipitation hardenable, high strength
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2012
Association for Materials Protection and Performance (AMPP)
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