Incoloy alloys 945 and 945X

Chemical Analysis
C Carbon
.005 – .04
Mn Manganese
1.00 max
Si Silicon
.50 max
Cr Chromium
19.5 – 23.0
Mo Molybdenum
3.0 – 4.0
Cu Copper
1.5 – 3.0
Ni Nickel
45 – 55
Cb Niobium
2.5 – 4.5
Ti Titanium
.5 – 2.5
Al Aluminium
.01 – .7
S and P Sulfur and Phosphorus
.03 max

General Characteristics of Incoloy alloys 945 and 945X

This is a high-strength, corrosion-resistant alloy designed for demanding applications in the oil and gas industry. This nickel-iron-chromium alloy is age hardenable and its properties are enhanced by additions of molybdenum, copper, columbium, titanium and aluminum.

Applications

The alloys are used in downhole applications requiring high strength, and corrosion resistance to aggressive sour wells with high levels of hydrogen sulfide and chlorides. Its resistance to stress cracking in environments high in hydrogen sulfide make it suitable for downhole and surface gas-well components including tubular products, valves, hangers, landing nipples, tool joints and packers. The alloy may also be used for fasteners, pump shafting and high-strength piping systems.
Alloy 945 is normally produced as annealed and aged to a minimum yield strength of 125ksi (860MPa)
Alloy 945X is normally produced as annealed and aged to a minimum yield strength of 140ksi (965MPa).
The properties of both alloys may be modified by varying amounts of cold work followed by appropriate annealing and aging treatments.

Forging

The alloy may be forged between 2100/1700ºF (1150/930ºC.) Optimum strength and corrosion resistance in the alloy is obtained following heat treatments, as subsequently described.

Heat treatment

Optimum properties and microstructure in these alloys are obtained from:

Anneal for ½ to 4 hrs at 1850/1950ºF (1010/1065ºC) and water quench

Age 1300-1350ºF (705/730ºC) for 6-8 hours; furnace cool at 50/100ºF (25/50ºC) per hour to 1125/1175ºF (605/635ºC), hold for 6-8 hours and air cool.

Machinability

The alloy may be machined in either the annealed or aged condition, providing the usual precautions are taken as with other materials with high work-hardening rates. Best results are obtained by rough machining prior to final heat treatment and finish machining after.

Weldability

The alloy may be readily welded by the gas-tungsten-arc process and by the pulsed gas-metal arc processes., using matching composition filler metal or 725NDUR filler metal.

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