Introduction
Inconel is a group of austenitic nickel-chromium-based super alloys produced by Special Metals Corporation. Super alloys are referred to as high performance alloys that function well in environments with elevated temperatures.
Super alloy INCONEL C-276 has high molybdenum content which provides the material with localized corrosion resistance like pitting. This alloy is generally known for corrosion resistance in a wide range of aggressive media. The low carbon content in this alloy helps to reduce carbide precipitation while performing welding.
The following section explains in detail about super alloy INCONEL C-276.
Chemical Composition
The chemical composition of INCONEL C-276 is outlined in the following table.
| Element |
Content (%) |
| Molybdenum, Mo |
15-17 |
| Chromium, Cr |
14.5-16.5 |
| Cobalt, Co |
2.5 max |
| Manganese, Mn |
1 |
| Vanadium, V |
0.35 max |
| Silicon, Si |
0.08 max |
| Phosphorus, P |
0.04 max |
| Sulfur, S |
0.03 max |
| Carbon, C |
0.01 max |
| Nickel. Ni |
62.5-67.5 |
Physical Properties
The physical properties of INCONEL C-276 are tabulated below.
| Properties |
Metric |
Imperial |
| Density |
8.89 g/cm3 |
0.321 lb/in3 |
| Melting point |
1325 °C |
2417 °F |
Mechanical Properties
The following table shows mechanical properties of INCONEL C-276.
| Properties |
Metric |
Imperial |
| Tensile strength |
740.5 MPa |
107400 psi |
| Yield strength |
347 MPa |
50300 psi |
| Elastic modulus |
205 GPa |
29700 ksi |
| Elongation at break |
67% |
67% |
Thermal Properties
The thermal properties of INCONEL C-276 are tabulated below.
| Properties |
Metric |
Imperial |
| Thermal conductivity (@23°C/73.4°F) |
9.80 W/m-K |
68.0 BTU in/hr.ft².°F |
Fabrication and Heat treatment
Welding
Weldability of INCONEL alloy C-276 is rated as good. This material can be used as-welded for most applications.
Hot Working
Hot working of this alloy can be performed 870 and 1230°C (1600 and 2250°F). in case of performing heavy working, it has to be above 1090°C (2000°F).
Annealing
INCONEL alloy C-276 can be annealed at 1150-1175°C (2100-2150°F) and rapidly cooled by water quenching.
Applications
INCONEL C-276 is chiefly used in the following areas:
Chemical processing
Pollution control
Pulp and paper production
Industrial and municipal waste treatment
Recovery of sour natural gas.
Products made using INCONEL C-276 are as follows:
Air pollution control components such as ducts, stack-gas re-heaters, dampers, stack liners, scrubbers, fans and fan housings
Components required in chemical processing such as reaction vessels, heat exchangers, evaporators, and transfer piping.
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