Inconel 718 vs Hastelloy C276: What's the Difference?
Inconel 718 vs Hastelloy C276: What's the Difference?
The main difference lies in the performance of Inconel 718, which excels in high-temperature strength and oxidation resistance, while Hastelloy C276 offers superior corrosion resistance, especially in acidic and reducing environments. Due to its high tensile strength, Inconel 718 is well-suited for structural components operating in high-temperature environments, such as jet engines; while Hastelloy C276 is better suited for chemical equipment and environments with a high risk of stress corrosion cracking.
What is the maximum operating temperature of Hastelloy C276?
Hastelloy C-276 is a nickel-molybdenum-chromium alloy with excellent corrosion resistance. This alloy is resistant to pitting corrosion, crevice corrosion, and stress corrosion cracking. Hastelloy C-276 can only be hardened through cold working. Its operating temperature range is from low temperatures to 750°F (400°C).
Inconel 718 alloy excels in high-strength applications due to its superior mechanical strength and oxidation resistance, making it particularly suitable for high-temperature environments such as aerospace. In contrast, Hastelloy C276 alloy is superior in corrosive applications, especially in its resistance to acids and chlorides, making it ideal for chemical processing and marine applications. The main trade-off lies between the high tensile strength of Inconel 718 and the excellent corrosion resistance of Hastelloy C276.
Comparison: Inconel 718 vs. Hastelloy C276
| Feature | Inconel 718 | Hastelloy C276 |
|---|---|---|
| Primary Advantage | High strength and mechanical properties at high temperatures | Exceptional resistance to a wide range of corrosive environments, including acids |
| Key Applications | Aerospace, gas turbines, jet engines, high-temperature structural components | Chemical processing, marine applications, handling harsh acids and chlorides |
| High-Temperature Performance | Designed to retain strength at extreme temperatures (e.g., up to 1,300°F or 704°C) and resist oxidation | Used where high-temperature corrosion resistance is key, but not necessarily for extreme mechanical stress at high temps |
| Corrosion Resistance | Good, but less resistant to severe corrosive agents compared to Hastelloy C276 | Superior resistance to pitting and stress-corrosion cracking in both oxidizing and reducing media |
| Chemical Composition | High in nickel, chromium, and iron | High in nickel, chromium, and significantly more molybdenum and tungsten |
| Weldability | Harden during machining, can be difficult to fabricate | Highly weldable and can be formed into complex shapes without compromising integrity |
Inconel 718 and Hastelloy C276 – Key Characteristics
Key characteristics of Inconel 718:
High Strength: Inconel 718 maintains high strength even at high temperatures, making it suitable for demanding structural applications.
Good Corrosion Resistance: This alloy exhibits good corrosion resistance in a variety of environments, including those containing chlorides, sulfides, and oxidizers.
Excellent Machinability: Inconel 718 is easy to weld, braze, and form, making it widely applicable in manufacturing processes.
Low Coefficient of Thermal Expansion: The alloy has a relatively low coefficient of thermal expansion, minimizing thermal stress during high-temperature operation.
Key characteristics of Hastelloy C276:
Excellent Corrosion Resistance: Hastelloy C276 exhibits excellent resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion, making it ideal for highly corrosive environments.
High Thermal Stability: This alloy retains its mechanical properties at high temperatures, making it suitable for high-temperature applications. Good machinability: Hastelloy C276 is easy to weld and form, but special care must be taken to maintain its corrosion resistance during welding.
Low magnetic permeability: This alloy has low magnetic permeability, which minimizes the risk of magneto-corrosion in certain environments.
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Inconel alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of Inconel 718 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 718 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 718, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
