Jul 24 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Hot Working
Cold working
Annealing
Other Designations
Applications
Introduction
Nicrofer 7016 TiNb alloy is a precipitation hardenable nickel-chromium-iron alloy that contains aluminum, niobium and titanium and exhibits good corrosion resistance at high and low temperatures. It also offers high strength at temperatures up to 820°C (1510°F) and excellent mechanical properties in cryogenic environments.
The following datasheet will provide an overview of nicrofer 7016 TiNb alloy.
Chemical Composition
The chemical composition of nicrofer 7016 TiNb alloy is outlined in the following table.
|
Element |
Content (%) |
|
Chromium, Cr |
14-17 |
|
Iron, Fe |
5-9 |
|
Titanium, Ti |
2.25-2.75 |
|
Manganese, Mn |
1 |
|
Niobium, Nb |
0.7-1.2 |
|
Copper, Cu |
0.5 |
|
Silicon, Si |
0.5 |
|
Aluminum, Al |
0.4-1 |
|
Carbon, C |
0.08 |
|
Sulfur, S |
0.01 |
|
Nickel, Ni |
Balance |
Physical Properties
The following table shows the physical properties of nicrofer 7016 TiNb alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.2 g/cm3 |
0.296 lb/in3 |
|
Melting point |
1390-1430°C |
2540-2600°F |
Mechanical Properties
The mechanical properties of nicrofer 7016 TiNb alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (Solution treated) |
782 MPa |
113 ksi |
|
Yield strength (Solution treated) |
391 MPa |
57 ksi |
|
Elongation at break (Solution treated) |
42% |
42% |
Thermal Properties
The thermal properties of nicrofer 7016 TiNb alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@100°C/212°F) |
13.2 µm/m°C |
7.3 µin/in°F |
|
Thermal conductivity (@20°C/68°F) |
10.5 W/mK |
73 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Machinability
Conventional machining techniques that are used for machining iron-based alloys can be used.
Forming
Nicrofer 7016 TiNb alloy has excellent ductility, and can be readily formed by all conventional techniques.
Welding
The alloy can be welded using commonly used welding techniques such as gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding and submerged-arc welding.
Heat Treatment
Nicrofer 7016 TiNb alloy can be heat treated at temperatures ranging from 885 to 1149°C (1625 to 2100°F).
Forging
Forging can be readily accomplished in the temperature range of 1038 to 1204°C (1900 to 2200°F).
Hot Working
The alloy can be hot worked in the temperature range of 982 to 1204°C (1800 to 2200°F).
Cold working
Cold working may be performed using standard tooling.
Annealing
The alloy is annealed at 982 to 1093°C (1800 to 2000°F) followed by air cooling.
Other Designations
Other designations that are equivalent to nicrofer 7016 TiNb alloy include the following:
|
AISI 688 |
AMS 5669 |
DIN 2.4669 |
|
AMS 5542 |
AMS 5670 |
DIN 2.4699 |
|
AMS 5582 |
AMS 5671 |
GE B50TF1232 |
|
AMS 5583 |
AMS 5698 |
GE B50YP44 |
|
AMS 5598 |
AMS 5699 |
MIL N-24114 |
|
AMS 5667 |
AMS 5747 |
MIL N-7786 |
|
AMS 5668 |
ASTM B637 |
MIL S-23192 |
Applications
The following are the list of applications of nicrofer 7016 TiNb alloy:
-
Thrust reversers and ducts of gas turbines
-
Cryogenic vessels
-
Heat treat fixtures
-
Springs and fasteners.