Introduction

Precipitation
Strengthened Alloy

Nickel

Iron

Chromium

Corrosion
Resistance

84

Mechanical
Behavior

91

Purity

87

Overview

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INCOLOY® alloy 945 (UNS N09945) is a high-strength, corrosion-resistant alloy designed for demanding applications in the oil and gas industry. The properties of this age hardenable nickel-iron-chromium alloy are enhanced by its contents of molybdenum, copper, niobium, titanium, and aluminum. The alloy’s nickel content results in resistance to chlorideinduced stress corrosion cracking. Nickel, in conjunction with the molybdenum and copper, also gives alloy 945 outstanding resistance to general corrosion in reducing media. Molybdenum also imparts resistance to localized attack (pitting and crevice corrosion). The alloy’s content of chromium provides resistance in oxidizing environments. Niobium, titanium and aluminum participate in the age hardening reaction that occurs during heat treatment. Their interaction forms gamma prime and gamma double prime precipitates, which strengthen the alloy.

INCOLOY alloy 945 is suitable for downhole oil and gas applications requiring high strength and corrosion resistance in aggressive sour wells containing high levels of hydrogen sulfide and chorides. Because of the alloy’s resistance to stress cracking in environments rich in hydrogen sulfide, it is suitable for downhole and surface gas-well components including tubular products, valves, hangers, landing nipples, tool joints and packers. The alloy can also be used for fasteners, pump shafting and high strength piping systems. INCOLOY alloy 945 is approved under NACE MR0175 / ISO 15156-3 for use in oil and gas applications up to NACE level VII and level VI-450ºF severity.

Mechanical Properties

INCOLOY alloy 945 is austenitic nickel-iron-chromium alloy made precipitation-hardenable by it contents of niobium, titanium, and aluminum. The precipitation hardening (age hardening) heat treatment induces the formation of Ni3(TiNbAl)-type (gama prime) and Ni3(NbTiAl)-type (gamma double-prime) precipitates. These particles are of sub-micron size and are uniformly distributed in the matrix resulting in high strength.

Physical Properties

Mechanical Properties