When selecting a nickel-based alloy for extreme corrosion, high temperature, or pressure environments, procurement teams often compare Inconel 625 and Hastelloy C276. While both alloys perform exceptionally in harsh conditions, their chemical design, corrosion mechanisms, strength levels, machinability, and cost structure differ significantly.
What is the advantages of Inconel 625?
Inconel 625's advantages are its exceptional strength (even at extreme temperatures, cryogenic to 2000°F), superior corrosion resistance (pitting, crevice, chloride stress-cracking), excellent oxidation resistance, good fabricability, and high fatigue strength, making it ideal for harsh marine, aerospace, chemical processing, and oil & gas environments where durability and reliability are critical.
What is Hastelloy C276 material?
Hastelloy C-276 (UNS N10276) is a highly versatile, nickel-chromium-molybdenum superalloy known for its exceptional resistance to corrosion in harsh chemical environments, handling reducing, oxidizing, and pitting conditions, making it ideal for chemical processing, pollution control, and pulp & paper industries.
Inconel 625 vs. Hastelloy C276: Key Differences
Inconel Alloy 625 vs Hastelloy Alloy C-276 Chemical Composition
| Element | Inconel 625 Content (%) | Hastelloy C-276 Content (%) |
|---|---|---|
| Nickel | 58.0 min | Balance |
| Chromium | 20.0 - 23.0 | 14.5 - 16.5 |
| Iron | 5.0 max | 4.0 - 7.0 |
| Molybdenum | 8.0 - 10.0 | 15.0 - 17.0 |
| Niobium (plus Tantalum) | 3.15 - 4.15 | - |
| Carbon | 0.10 max | 0.01 max |
| Manganese | 0.50 max | 1.0 max |
| Silicon | 0.50 max | 0.08 max |
| Phosphorus | 0.015 max | 0.04 max |
| Sulfur | 0.015 max | 0.03 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 |
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 |
Inconel Alloy 625 vs. Hastelloy Alloy C-276: Strength
Inconel Alloy 625 generally offers higher room-temperature and intermediate-temperature strength, with minimum tensile strength ≥827 MPa and yield strength ≥414 MPa, compared with Hastelloy C-276 at ~790 MPa tensile and ~355 MPa yield, making 625 better suited for structural components under combined load and fatigue, while C-276 prioritizes extreme corrosion resistance.
Inconel Alloy 625 vs. Hastelloy Alloy C-276: Weldability
Both alloys exhibit excellent weldability, but Inconel 625 is often preferred for fabrication because it has very low susceptibility to hot cracking and typically does not require post-weld heat treatment, whereas Hastelloy C-276, while weldable, demands stricter control of heat input and filler selection to maintain corrosion resistance in highly aggressive chemical environments.
What is the difference between C276 and 316?
A direct comparison between the two reveals notable disparities: while Alloy C276 boasts superior strength, 316 stainless steel excels in corrosion resistance, especially at elevated temperatures compared to Alloy C276. However, both materials share commendable traits such as exceptional formability and weldability.
Inconel 718 suppliers
At GNEE, Inconel 718 is available in various forms to meet diverse industrial needs:
Plates and Sheets (cold rolled and hot rolled)
Bars and Rods (round, square, hexagonal)
Tubes (seamless and welded)
Wires and Strips (for springs, fasteners, electrical applications)
Forgings and Custom Parts (according to drawings or specifications)
Specifications: UNS NO7718, WNR 2.4668, AFNOR NC19FeNb, JIS NCF 718, GOST ХН75МБТЮ, EURONORM NiCr22Mo9Nb, OR ЭИ602, BS NA 21.
Temperature Range: -423°F to 1300°F.
Testing and Documentation: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Testing Reports, Non-Destructive Testing Reports, PMI Test Reports, Visual Inspection Reports, Third-Party Inspection Reports, NABL Certified Laboratory Reports.
Packaging: Wooden crates, bubble wrap, steel strapping, or packaged according to customer requirements.
