Inconel 625 and Hastelloy C276: Main Differences and Applications
Inconel 625 and Hastelloy C276: Main Differences and Applications
Inconel 625, due to its higher chromium content, exhibits superior high-temperature strength and oxidation resistance (making it more suitable for aerospace, marine, and oxidizing environments), while Hastelloy C-276, with its higher molybdenum content, excels in handling extreme corrosive conditions (chemical processing, acidic gases, reducing acids), although both possess excellent overall corrosion resistance. The main difference lies in Inconel 625's strength advantage in high-temperature/oxidizing environments and C-276's resistance to reducing corrosion/pitting, which dictates their different applications in the aerospace industry (625) and chemical plants (C-276).
What are the uses of Hastelloy C276?
C-276 alloy is widely used in a variety of harsh environments, such as chemical processing, pollution control, pulp and paper production, industrial and municipal wastewater treatment, and sour gas recovery.
Hastelloy C-276 is a nickel-molybdenum-chromium-tungsten superalloy whose core advantage lies in its almost universal corrosion resistance. It effectively resists strong oxidizing and reducing acids, mixed acids, chlorides, wet chlorine gas, and harsh acidic salt solutions, exhibiting exceptional resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking. It is specifically designed for the most corrosive industrial environments, such as hydrometallurgy, chemical and pharmaceutical industries, flue gas desulfurization, waste incineration, and marine engineering, making it one of the top engineering materials with the broadest range of corrosion resistance among commercially available alloys.
Inconel 625 is a nickel-chromium-based high-temperature alloy strengthened by solid solution hardening with molybdenum and niobium. Its core advantage is its comprehensive and excellent corrosion resistance combined with high strength. It not only exhibits excellent resistance to both oxidizing and reducing media, but is also particularly adept at resisting pitting corrosion, crevice corrosion, and chloride stress corrosion cracking. Furthermore, its outstanding high-temperature strength (up to approximately 980°C) and resistance to creep and fatigue make it widely used in extreme corrosive and high-temperature environments in marine engineering, aerospace, chemical and environmental protection, and energy sectors. It is a top-tier engineering alloy with a broader and more robust performance than Inconel 600.
Key Chemical Composition: Alloy 625 VS Hastelloy C276
| Element | Ni | Cr | Mo | W | Fe | Nb | C |
|---|---|---|---|---|---|---|---|
| Alloy 625 | ≥58.0 | 20.0-23.0 | 8.0-10.0 | ≤0.35 | ≤5.0 | 3.15-4.15 | ≤0.10 |
| Hastelloy C276 | Balance (Min 53.0) | 14.5-16.5 | 15.0-17.0 | 3.0-4.5 | 4.0-7.0 | N/A | ≤0.01 |
Mechanical Properties: Alloy 625 VS Hastelloy C276
| Property | Tensile Strength | Yield Strength | Elongation | Density |
|---|---|---|---|---|
| Alloy 625 | ≥827 MPa (120 ksi) | ≥414 MPa (60 ksi) | ≥30% | 8.43g/cm³ |
| Hastelloy C276 | ≥690MPa (100 ksi) | ≥275MPa (40 ksi) | ≥40% | 8.89g/cm³ |
Comparison of Alloy 625 and Hastelloy C276 grades
| Standard Body | Alloy 625 Designation | Hastelloy C276 Designation |
|---|---|---|
| UNS | N06625 | N10276 |
| EN | 2.4856 | 2.4819 |
| ASTM/ASME | B443, B444, B474, etc. | B575, B574, B619, etc. |
| ISO | 6208 | 15156-3 |
| GB (China) | NS3306 | NS3304 |
Alloy 625 VS Hastelloy C276: Key Differentiators
Corrosion Resistance
Alloy 625 exhibits broad corrosion resistance, showing good tolerance to both oxidizing and reducing acids. Hastelloy C276 possesses excellent corrosion resistance, performing exceptionally well in corrosive oxidizing and reducing media, including wet chlorine.
Strength and Temperature Resistance
Alloy 625 has higher strength and performs well across a temperature range from low temperatures up to 1000°C. Hastelloy C276 also exhibits excellent high-temperature strength and maintains its corrosion resistance at extreme temperatures.
Molybdenum and Tungsten Content
Hastelloy C276 contains high levels of molybdenum and tungsten, which significantly enhances its resistance to pitting and crevice corrosion. This gives C276 an advantage in certain specialized and harsh environments.
Weldability
Both alloys have good weldability. Due to its higher alloy content, Hastelloy C276 is slightly more difficult to weld. Proper welding procedures are crucial for both alloys. Low-carbon versions can improve post-weld integrity.
Cost Factors
Generally, Hastelloy C276 is more expensive due to its unique composition and superior corrosion resistance.
Applications of Inconel 625 and Hastelloy C-276
Hastelloy C276: Widely used in chemical processing, pollution control, pulp and paper production, waste treatment, and sour gas wells.
Inconel 625: Due to its high strength, oxidation resistance, and excellent weldability, it is commonly used in aerospace, marine, and nuclear energy applications.
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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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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