Jul 9 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
Inconel is a group of austenitic nickel-chromium-based super alloys designed by Special Metals Corporation. Super alloys are high performance alloys that function well in environments with very high temperature. INCONEL 740 is a nickel-chromium-cobalt alloy that is age hardenable by the precipitation of a gamma prime second phase.
The following section explains in detail about super alloy INCONEL 740.
Chemical Composition
The chemical composition of INCONEL 740 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel. Ni |
48.27 |
|
Chromium, Cr |
25 |
|
Cobalt, Co |
20 |
|
Niobium, Nb |
2 |
|
Titanium, Ti |
1.8 |
|
Aluminum, Al |
0.9 |
|
Iron, Fe |
0.7 |
|
Silicon, Si |
0.5 |
|
Molybdenum, Mo |
0.5 |
|
Manganese, Mn |
0.3 |
|
Carbon, C |
0.03 |
Physical Properties
The physical properties of INCONEL 740 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.05 g/cm3 |
0.291 lb/in3 |
|
Melting point |
1288 - 1362 °C |
2350 - 2484 °F |
Mechanical Properties
The following table shows mechanical properties of INCONEL 740.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1209 MPa |
175300 psi |
|
Yield strength |
818.4 MPa |
118700 psi |
|
Elastic modulus |
221 GPa |
32 ksi |
|
Elongation at break |
36.40% |
36.40% |
|
Hardness, Rockwell C |
33.6 |
33.6 |
Thermal Properties
The thermal properties of INCONEL 740 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@100°C/212°F) |
12.38 µm/m°C |
6.878 µin/in°F |
|
Thermal conductivity (@23°C/73.4°F) |
10.2 W/m-K |
70.8 BTU in/hr.ft².°F |
Applications
INCONEL 740 is chiefly used in advanced power production boiler tubes and diesel engine exhaust valves.