A comprehensive comparison of Hastelloy alloy C-276 and Inconel alloy 625
A comprehensive comparison of Hastelloy alloy C-276 and Inconel alloy 625
Due to its high molybdenum and tungsten content, Hastelloy C-276 performs exceptionally well in harsh reducing/oxidizing chemical environments (such as wet chlorine and strong acids); while Inconel 625 offers a wider range of applications, better high-temperature strength, and superior resistance to seawater/oxidizing acids (such as nitric acid) corrosion due to its higher chromium and niobium content. Therefore, C-276 is more suitable for extremely corrosive environments, while 625 is better suited for applications requiring high strength and versatility.
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 strengthened through cold working. The operating temperature range for Hastelloy C-276 is from cryogenic temperatures up to 750°F (400°C).
What is Inconel Alloy 625?
INCONEL 625 nickel-chromium alloy (UNS N06625 / W.Nr. 2.4856) is widely used due to its high strength, excellent processing characteristics (including welding), and outstanding corrosion resistance. Its operating temperature range extends from cryogenic temperatures to 1800°F (982°C).
What is Hastelloy Alloy C-276?
Hastelloy C-276 alloy (UNS N10276) was the first wrought nickel-chromium-molybdenum alloy material developed to address welding problems by reducing carbon and silicon content. Consequently, it has been widely used in the chemical and related industries, boasting a successful application history of over 50 years and demonstrating excellent performance in numerous corrosive chemical environments.
Inconel Alloy 625 vs Hastelloy Alloy C-276 Chemical Composition
| Element | Inconel 625 Content (%) | Hastelloy C-276 Content (%) |
|---|---|---|
| Nickel (Ni) | 58.0 min | Balance |
| Chromium (Cr) | 20.0 - 23.0 | 14.5 - 16.5 |
| Iron (Fe) | 5.0 max | 4.0 - 7.0 |
| Molybdenum (Mo) | 8.0 - 10.0 | 15.0 - 17.0 |
| Niobium (Nb) + Tantalum | 3.15 - 4.15 | - |
| Carbon (C) | 0.10 max | 0.01 max |
| Manganese (Mn) | 0.50 max | 1.0 max |
| Silicon (Si) | 0.50 max | 0.08 max |
| Phosphorus (P) | 0.015 max | 0.04 max |
| Sulfur (S) | 0.015 max | 0.03 max |
| Aluminum (Al) | 0.40 max | - |
| Titanium (Ti) | 0.40 max | - |
| Cobalt (Co) | 1.0 max | 2.5 max |
| Tungsten (W) | - | 3.0 - 4.5 |
| Vanadium (V) | - | 0.35 max |
| Inconel 625 | Hastelloy C-276 | |
|---|---|---|
| Density, g/cm³ | 8.44 | 8.89 |
| Density, lb/in.³ | 0.305 | 0.321 |
| Melting Range, °F | 2350-2460 | 2415-2500 |
| Melting Range, °C | 1290-1350 | 1323-1371 |
Corrosion Resistance:
Inconel Alloy 625:
Exhibits excellent corrosion resistance in a variety of corrosive environments (including acids, salts, and seawater).
It is particularly resistant to crevice corrosion and pitting.
Hastelloy Alloy C-276:
Offers superior corrosion resistance in both oxidizing and reducing environments.
It is highly resistant to chloride-induced stress corrosion cracking and pitting.
Conclusion: While both alloys offer excellent corrosion resistance, Hastelloy C-276 alloy is generally preferred in applications involving harsh chemical environments and where extremely high resistance to localized corrosion is required.
Temperature Resistance:
Inconel Alloy 625:
Exhibits good strength and oxidation resistance at high temperatures up to approximately 980°C (1800°F).
Hastelloy Alloy C-276:
Exhibits excellent strength and oxidation resistance at high temperatures up to approximately 1040°C (1900°F).
Conclusion: Compared to Inconel 625, Hastelloy C-276 generally performs better at higher temperatures.
Inconel Alloy 625 vs Hastelloy Alloy C-276 Main Standards
| Product Form | Inconel 625 Standards | Hastelloy C-276 Standards |
|---|---|---|
| Seamless Pipe and Tube | ASTM B444, ASTM B829 | ASTM B622, ASTM B983 |
| Welded Pipe | ASTM B705, ASTM B775 | ASTM B619 |
| Welded Tube | ASTM B704, ASTM B751 | ASTM B626 |
| Welded Fittings | ASTM B366 | ASTM B366, ASTM B462 |
| Rod and Bar | ASTM B446 | ASTM B574 |
| Forgings | ASTM B564 | ASTM B564, ASTM B462 |
| Plate, Sheet, and Strip | ASTM B443 | ASTM B575 |
Applications:
Inconel Alloy 625:
Used in marine and aerospace applications, chemical processing equipment, and nuclear reactors.
Hastelloy Alloy C-276:
Widely used in chemical processing, pollution control, pulp and paper production, and waste treatment.
Conclusion: Hastelloy C-276 is often chosen for its superior corrosion resistance in corrosive chemical environments, while Inconel 625 is suitable for applications where high strength and oxidation resistance are critical.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
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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@gneesteel.com for a quote.
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