Inconel C263 and Hastelloy C276 are both high-performance nickel-based superalloys, each with unique properties that make them valuable in different industrial applications. This comparison highlights the key differences between these two alloys, including their chemical composition, mechanical properties, temperature performance, and typical uses. Understanding these distinctions is crucial for engineers and designers when selecting materials for specific projects, particularly those involving high temperatures or corrosive environments. Let’s examine these alloys in detail:
Chemical Composition (nominal, weight %)
| Element | Inconel C263 | Hastelloy C276 |
|---|---|---|
| Nickel | Balance | Balance |
| Chromium | 19-21 | 14.5-16.5 |
| Molybdenum | 5.6-6.1 | 15-17 |
| Cobalt | 19-21 | 2.5 max |
| Tungsten | – | 3-4.5 |
| Iron | 0.7 max | 4-7 |
| Titanium | 1.9-2.4 | – |
| Aluminum | 0.3-0.6 | – |
Mechanical Properties (typical)
| Property | Inconel C263 | Hastelloy C276 |
|---|---|---|
| Tensile Strength (MPa) | 850-1050 | 690-930 |
| Yield Strength (MPa) | 550-680 | 280-360 |
| Elongation (%) | 25-40 | 50-60 |
| Hardness (Brinell) | 220-270 | 190-230 |
Temperature Performance
| Aspect | Inconel C263 | Hastelloy C276 |
|---|---|---|
| Max Service Temp (°C) | 850 | 1100 |
| Oxidation Resistance | Excellent | Very Good |
Corrosion Resistance
| Environment | Inconel C263 | Hastelloy C276 |
|---|---|---|
| Oxidizing | Excellent | Excellent |
| Reducing | Good | Excellent |
| Pitting/Crevice | Very Good | Excellent |
Key Features
Inconel C263:
- High strength at elevated temperatures
- Good oxidation resistance
- Excellent creep resistance
- Used in gas turbine components, exhaust systems
Hastelloy C276:
- Exceptional corrosion resistance in a wide range of environments
- Excellent resistance to pitting and stress corrosion cracking
- Good fabricability and weldability
- Used in chemical processing, pollution control, pulp and paper production
Typical Applications
Inconel C263:
- Gas turbine components (combustion cans, transition ducts)
- High-temperature fasteners
- Heat shields
- Exhaust systems
Hastelloy C276:
- Chemical processing equipment
- Flue gas desulfurization systems
- Offshore oil and gas components
- Nuclear waste treatment facilities
Weldability
| Aspect | Inconel C263 | Hastelloy C276 |
|---|---|---|
| Weldability | Good | Excellent |
| Post-weld Heat Treatment | Required | Not typically required |