Inconel 625 Alloy vs. Hastelloy C-276 Alloy: A Comprehensive Comparison
Inconel 625 Alloy vs. Hastelloy C-276 Alloy: A Comprehensive Comparison
Under less demanding conditions, Inconel 625 offers a balance of strength, toughness, and corrosion resistance at a lower cost; while Hastelloy C-276, with its higher molybdenum content, performs exceptionally well in harsh corrosive environments, particularly suitable for reducing acids such as hydrochloric acid. The main difference lies in their elemental composition: Inconel 625 contains more chromium to enhance its oxidation resistance, while Hastelloy C-276 contains more molybdenum to enhance its reduction resistance. The optimal choice depends on the specific application environment, temperature, and budget.
What are the advantages of Inconel 625?
Inconel 625 alloy is an ideal choice for seawater applications because it possesses the following characteristics: it is not prone to localized corrosion (pitting and crevice corrosion), has high corrosion fatigue strength, high tensile strength, and is resistant to chloride stress corrosion cracking.
Hastelloy C276 and Inconel 625 Overview
Hastelloy C276:
Composition: Nickel, Molybdenum, Chromium, Iron, Tungsten
Excellent corrosion resistance in both oxidizing and reducing environments
High resistance to pitting and crevice corrosion
Excellent resistance to chloride-induced stress corrosion cracking (SCC)
Good mechanical properties at high temperatures
Nickel Alloy 625:
Composition: Nickel, Chromium, Molybdenum, Niobium, Iron
Excellent corrosion resistance in a variety of corrosive environments
Exceptionally strong resistance to crevice and pitting corrosion
Good strength and oxidation resistance at high temperatures
Maintains mechanical properties over a wide temperature range.
Inconel Alloy 625 vs Hastelloy Alloy C-276 Chemical Composition
The following is a comparison table of the chemical compositions of Inconel 625 and Hastelloy alloy C-276:
| 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 |
| Aluminum | 0.40 max | - |
| Titanium | 0.40 max | - |
| Cobalt | 1.0 max | 2.5 max |
| Tungsten | - | 3.0 - 4.5 |
| Vanadium | - | 0.35 max |
Inconel Alloy 625 vs Hastelloy Alloy C-276 Physical Properties
| 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
Here's a comparison table for the standards of Inconel alloy 625 and Hastelloy alloy C-276:
| 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 |
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
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel is a supplier of Inconel 625 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 625 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 625, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
