Incoloy 825 vs Hastelloy C276
Incoloy 825 vs Hastelloy C276
Incoloy 825 (nickel-iron-chromium alloy) exhibits excellent corrosion resistance to reducing acids such as sulfuric and phosphoric acids, possesses good ductility, and is titanium-stabilized to ensure weld integrity, making it ideal for general chemical processing. Hastelloy C-276 (nickel-molybdenum alloy), on the other hand, performs better in strongly oxidizing/reducing environments, offering higher strength, hardness, and superior resistance to pitting and crevice corrosion (especially in chloride-containing environments), making it an ideal choice for highly corrosive chemical, marine, and flue gas desulfurization applications, although it has lower ductility and is more expensive.
Is Hastelloy C276 resistant to hydrochloric acid corrosion?
C-276 alloy exhibits excellent corrosion resistance to sulfuric acid, hydrochloric acid, formic acid, acetic acid, chlorides, solvents, wet chlorine gas, hypochlorites, and chlorine solutions. C-276 alloy also demonstrates excellent corrosion resistance to phosphoric acid at all temperatures below the boiling point and at concentrations below 65%.
What is Incoloy 825?
Incoloy 825 is a nickel-iron-chromium alloy with additions of copper, molybdenum, and titanium. It exhibits excellent corrosion resistance in both acidic and alkaline environments, making it ideal for use in various industries such as petrochemicals, nuclear reactors, offshore oil and gas production, and marine applications. In addition to its superior corrosion resistance, Incoloy 825 also possesses good heat resistance and excellent strength over a wide temperature range.
What is Hastelloy C276?
Hastelloy C276 is an alloy that offers corrosion resistance in a wide range of environments, making it suitable for various industrial applications. It also possesses excellent strength and toughness, making it suitable for high-temperature applications.
Chemical Composition of Incoloy 825 vs Hastelloy C-276
| Element | Incoloy 825 (UNS N08825) Content (%) | Hastelloy C-276 (UNS N10276) Content (%) |
|---|---|---|
| Nickel | 38.0 - 46.0 | 57.0 min (Balance) |
| Chromium | 19.5 - 23.5 | 14.5 - 16.5 |
| Molybdenum | 2.5 - 3.5 | 15.0 - 17.0 |
| Iron | ≥ 22.0 | 4.0 - 7.0 |
| Copper | 1.5 - 3.0 | - |
| Tungsten | - | 3.0 - 4.5 |
| Cobalt | - | 2.5 max |
| Manganese | ≤ 1.0 | 1.0 max |
| Silicon | ≤ 0.5 | 0.08 max |
| Carbon | ≤ 0.05 | 0.01 max |
| Phosphorus | ≤ 0.03 | 0.04 max |
| Sulfur | ≤ 0.03 | 0.03 max |
| Vanadium | - | 0.35 max |
| Titanium | 0.6 - 1.2 | - |
| Aluminum | 0.1 - 0.5 | - |
Mechanical Properties of Incoloy 825 vs Hastelloy C-276
| Property | Incoloy 825 (Annealed) | Hastelloy C-276 (Annealed) |
|---|---|---|
| Tensile Strength, Ultimate | 586 MPa (85 ksi) | 690 MPa (100 ksi) |
| Tensile Strength, Yield (0.2% Offset) | 241 MPa (35 ksi) | 283 MPa (41 ksi) |
| Elongation at Break | 30% (in 50 mm) | 40% (in 50 mm) |
| Reduction of Area | 50% | 50% |
| Hardness, Rockwell B | 78 HRB | 87 HRB |
| Hardness, Brinell | 160 HB | 190 HB |
Corrosion Resistance
Both Incoloy 825 and Hastelloy C276 are known for their excellent corrosion resistance. Incoloy 825 is best suited for environments containing sulfuric and phosphoric acids. In contrast, Hastelloy C276 is more suitable for seawater, marine environments, and chemical environments containing chlorides and other halides. Overall, Hastelloy C276 exhibits superior performance in resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking, making it an ideal choice for critical applications.
Applications of Incoloy 825 and Hastelloy C276
Thanks to their excellent corrosion resistance and mechanical properties, Incoloy 825 and Hastelloy C276 are widely used in various industries, including chemical, oil and gas, desalination, and offshore drilling. Incoloy 825 is commonly used in heat exchangers, storage tanks, and pipe valves. On the other hand, Hastelloy C276 is more suitable for high-temperature and highly corrosive environments, such as reactors, chemical equipment, and flue gas desulfurization systems.
Key differences in chemical composition between Incoloy 825 and Hastelloy C-276 and their implications.
| Element | Incoloy 825 | Hastelloy C276 | Impact on Properties |
|---|---|---|---|
| Nickel (Ni) | 38.0 – 46.0% | ≥ 57% | Higher Ni in C276 enhances general corrosion resistance and ductility. |
| Iron (Fe) | ≥ 22.0% | 4 – 7% | Higher Fe in 825 improves strength and oxidation resistance. |
| Chromium (Cr) | 19.5 – 23.5% | 14.5 – 16.5% | Higher Cr in 825 favors oxidation resistance; C276 optimized for combined oxidizing and reducing environments. |
| Molybdenum (Mo) | 2.5 – 3.5% | ≥ 15% | Much higher Mo in C276 gives superior resistance to pitting and crevice corrosion. |
| Copper (Cu) | 1.5 – 3.0% | ≤ 0.5% | Cu in 825 enhances resistance to reducing acids; negligible in C276. |
| Titanium (Ti) | 0.6 – 1.2% | Not significant | Ti in 825 stabilizes against intergranular corrosion; absent in C276. |
| Carbon (C) | ≤ 0.05% | ≤ 0.01% | Lower C in C276 reduces carbide precipitation, improving weldability and corrosion resistance. |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
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All stainless steel products are packaged using the following methods:
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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 ss@gneemetal.com for a quote.
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