Jul 25 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Cold Working
Annealing
Hardening
Other Designations
Applications
Introduction
Nimonic 75 alloy is a nickel-chromium alloy that has good mechanical properties and oxidation resistance at elevated temperatures. The alloy is strengthened by the addition of titanium.
The following datasheet will discuss in detail about nimonic 75 alloy.
Chemical Composition
The chemical composition of nimonic 75 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Chromium, Cr |
18-21 |
|
Iron, Fe |
5 |
|
Manganese, Mn |
1 |
|
Silicon, Si |
1 |
|
Copper, Cu |
0.5 |
|
Titanium, Ti |
0.2-0.6 |
|
Carbon, C |
0.08-0.15 |
|
Nickel, Ni |
Balance |
Physical Properties
The following table shows the physical properties of nimonic 75 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.37 g/cm3 |
0.302 lb/in3 |
|
Melting point |
1340-1380°C |
2440-2520°F |
Mechanical Properties
The mechanical properties of nimonic 75 alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (Annealed) |
750 MPa |
109000 psi |
|
Yield strength (Annealed) |
275 MPa |
39900 psi |
|
Elongation at break (Annealed prior to test) |
42% |
42% |
Thermal Properties
The thermal properties of nimonic 75 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
11 µm/m°C |
6.11 µin/in°F |
|
Thermal conductivity |
11.7 W/mK |
81.2 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Machinability
Nimonic 75 alloy can be machined using conventional machining techniques used for iron-based alloys.
Forming
The alloy has good ductility, and can be readily formed using all conventional methods.
Welding
Nimonic 75 alloy can be welded using conventional welding techniques such as gas-tungsten arc welding, shielded metal-arc welding and submerged-arc welding.
Heat Treatment
The alloy can be annealed at (1925°F) and then air cooled.
Forging
The alloy can be hot forged at temperatures in the range of 982 to 1204°C (1800 to 2200°F).
Cold Working
Cold working of this alloy can be done using standard tooling.
Annealing
The alloy can be annealed at 1052°C (1925°F) and air cooled.
Hardening
The alloy can be hardened by cold working.
Other Designations
Other designations that are equivalent to nimonic 75 alloy include the following:
Applications
The following are the list of applications of nimonic 75 alloy:
-
Gas-turbine engines
-
Industrial furnaces
-
Heat-treating equipment and fixtures
-
Nuclear engineering.