Differences between Inconel 718 and Hastelloy C276 alloys
Differences between Inconel 718 and Hastelloy C276 alloys
Inconel 718 excels in high-temperature strength, oxidation resistance, and aerospace applications, while Hastelloy C-276, with its higher molybdenum content, dominates in extremely corrosive chemical environments, particularly in chloride and acidic environments. Although both are nickel-based superalloys used in demanding environments, C-276 offers superior corrosion resistance, while 718 exhibits superior mechanical strength at extremely high temperatures.
What is the maximum operating temperature of Hastelloy C276?
Hastelloy C-276 is a nickel-molybdenum-chromium corrosion-resistant alloy. This alloy is resistant to pitting, crevice corrosion, and stress corrosion cracking. Hastelloy C-276 can only be hardened by cold working. The operating temperature range for Hastelloy C-276 extends from cryogenic temperatures up to 750°F (400°C).
Definitions of Inconel 718 and Hastelloy C276
Inconel 718, also known as UNS N07718, is a precipitation-hardening nickel-chromium alloy that combines the strength of forged steel with the corrosion resistance of nickel-based alloys. First developed in the 1950s, it has since become a widely used material in the aerospace, oil and gas, and chemical industries.
Hastelloy C276, also known as UNS N10276, is a nickel-molybdenum-chromium superalloy renowned for its exceptional corrosion resistance in a wide range of corrosive environments. Developed in the 1960s, it has since been used in the most demanding chemical, oil and gas, and marine environments.
Comparison of Key Properties of Inconel 718 and Hastelloy C276
Key Properties of Inconel 718:
High Strength: Inconel 718 maintains high strength even at elevated temperatures, making it suitable for demanding structural applications.
Good Corrosion Resistance: This alloy exhibits corrosion resistance in a variety of environments, including those containing chlorides, sulfides, and oxidizing agents.
Excellent Machinability: Inconel 718 is easily welded, brazed, and formed, making it versatile in manufacturing processes.
Low Thermal Expansion Coefficient: The alloy has a relatively low coefficient of thermal expansion, minimizing thermal stress during high-temperature operations.
Key Properties of Hastelloy C276:
Excellent Corrosion Resistance: Hastelloy C276 exhibits exceptional resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion, making it ideal for highly corrosive environments.
High Thermal Stability: This alloy maintains its mechanical properties at high temperatures, making it suitable for high-temperature applications.
Good Machinability: Hastelloy C276 is easily welded and formed, although some special considerations should be taken during welding to maintain its corrosion resistance.
Low Magnetic Permeability: The alloy has low magnetic permeability, minimizing the risk of magnetostrictive corrosion in certain environments.
Chemical Composition of Inconel 718 vs Hastelloy C-276
| Element | Inconel 718 (UNS N07718) Content (%) | Hastelloy C-276 (UNS N10276) Content (%) |
|---|---|---|
| Nickel | 50.0 - 55.0 | 57.0 min (Balance) |
| Chromium | 17.0 - 21.0 | 14.5 - 16.5 |
| Iron | Balance | 4.0 - 7.0 |
| Molybdenum | 2.8 - 3.3 | 15.0 - 17.0 |
| Niobium + Tantalum | 4.75 - 5.50 | - |
| Titanium | 0.65 - 1.15 | - |
| Aluminum | 0.20 - 0.80 | - |
| Cobalt | ≤ 1.0 | 2.5 max |
| Tungsten | - | 3.0 - 4.5 |
| Copper | ≤ 0.30 | - |
| Manganese | ≤ 0.35 | 1.0 max |
| Silicon | ≤ 0.35 | 0.08 max |
| Carbon | ≤ 0.08 | 0.01 max |
| Phosphorus | ≤ 0.015 | 0.04 max |
| Sulfur | ≤ 0.015 | 0.03 max |
| Vanadium | - | 0.35 max |
| Boron | ≤ 0.006 | - |
Mechanical Properties of Inconel 718 vs Hastelloy C-276
| Property | Inconel 718 (Solution Annealed + Aged) | Hastelloy C-276 (Annealed) |
|---|---|---|
| Tensile Strength, Ultimate | 1380 MPa (200 ksi) | 690 MPa (100 ksi) |
| Tensile Strength, Yield (0.2% Offset) | 1170 MPa (170 ksi) | 283 MPa (41 ksi) |
| Elongation at Break | 12% (in 50 mm) | 40% (in 50 mm) |
| Reduction of Area | 15% | 50% |
| Hardness, Rockwell C | 40 HRC | Not applicable (typically HRB) |
| Hardness, Rockwell B | - | 87 HRB |
| Hardness, Brinell | 400 HB | 190 HB |
| Modulus of Elasticity | 200 GPa (29.0 x 10⁶ psi) | 205 GPa (29.7 x 10⁶ psi) |
How to choose:
If the part needs to maintain extremely high strength at high temperatures (e.g., turbine blades), choose Inconel 718 alloy.
If the part is used in wet, corrosive chemical processing or marine environments (e.g., chemical storage tanks, scrubbers), choose Hastelloy C-276 alloy.
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About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at
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