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 hastelloy 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 ¡ãC |
2417 ¡ãF |
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¡ãC/73.4¡ãF) |
9.80 W/m-K |
68.0 BTU in/hr.ft².¡ãF |
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¡ãC (1600 and 2250¡ãF). in case of performing heavy working, it has to be above 1090¡ãC (2000¡ãF).
Annealing
INCONEL alloy C-276 can be annealed at 1150-1175¡ãC (2100-2150¡ãF) 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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