Jul 3 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Applications
Introduction
INCOLOY alloy 945 is a high-strength, corrosion-resistant alloy whose properties are enhanced by the presence of aluminum, titanium, niobium, copper and molybdenum in its composition. The alloy’s nickel content provides resistance to chloride-induced stress corrosion cracking. Molybdenum also imparts resistance to localized attacks such as crevice corrosion and pitting.
The following datasheet will provide an overview of INCOLOY alloy 945.
Chemical Composition
The chemical composition INCOLOY alloy 945 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
45-55 |
|
Chromium, Cr |
19.5-23 |
|
Molybdenum, Mo |
3-4 |
|
Niobium, Nb |
2.5-4.5 |
|
Copper, Cu |
1.5-3 |
|
Manganese, Mn |
1 |
|
Silicon, Si |
0.5 |
|
Titanium, Ti |
0.5-2.5 |
|
Sulfur, S |
0.03 |
|
Phosphorus, P |
0.03 |
|
Aluminum, Al |
0.01-0.7 |
|
Carbon, C |
0.005-0.04 |
|
Iron, Fe |
Balance |
Physical Properties
The following table shows the physical properties of INCOLOY alloy 945.
|
Properties |
Metric |
Imperial |
|
Density |
8.2 g/cm3 |
0.296 lb/in3 |
|
Melting point |
1270-1377°C |
2317-2510°F |
Mechanical Properties
The mechanical properties of INCOLOY alloy 945 are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1194 MPa |
173.2 ksi |
|
Yield strength |
920 MPa |
133.4 psi |
|
Elongation at break |
27.80% |
27.80% |
Thermal Properties
The thermal properties of INCOLOY alloy 945 are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@93°C/200°F) |
14.19 µm/m°C |
7.88 µin/in°F |
|
Thermal conductivity (23°C/73°F) |
10.9 W/mK |
75.9 BTU.in/hrft².°F |
Fabrication and Heat Treatment
INCOLOY alloy 945 exhibits good machinability under solution annealed or aged conditions. Rigid tools with positive rake angles must be used in order to minimize work hardening of the material. It can be an be readily welded by the gas-tungsten-arc welding and pulsed gas-metal-arc welding processes. The alloy is annealed 1010-1066°C (1850-1950°F) for 1/2 to 4 h and then water quenched. Following this, the alloy is age-hardened at 704-732°C (1300-1350°F) for 6-8 h and furnace cooled at 26-56°C (50-100°F).
Applications
The following are the list of applications of INCOLOY alloy 945:
-
Downhole oil and gas applications
-
Fasteners
-
High strength piping systems
-
Pump shafting.