What is the difference between Inconel 718 and Incoloy 825?
The main difference lies in their properties. Inconel 718 is a high-strength alloy primarily used in the aerospace industry due to its excellent high-temperature mechanical properties and good corrosion resistance. Inconel X-750, on the other hand, is better suited for applications requiring high creep rupture strength, oxidation resistance, and thermal fatigue resistance, such as in the power generation and chemical industries. Inconel 718 contains molybdenum, resulting in a more complex chemical composition that provides superior strength and corrosion resistance, while X-750 is strengthened by the addition of aluminum and titanium.
What are the disadvantages of Inconel 718?
Disadvantages and alternatives of Inconel 718
While Inconel 718 boasts excellent mechanical and corrosion resistance properties, it also has some drawbacks: High cost: Due to its complex manufacturing process, Inconel 718 is expensive. Difficult to process: Its high hardness makes material removal difficult and accelerates tool wear.
Incoloy Alloy 825 vs Inconel Alloy 718 Chemical Composition
Chemical Composition: Inconel 718 vs. Incoloy 825 (Weight %)
| Element | Inconel 718 Content (%) | Incoloy 825 Content (%) |
|---|---|---|
| Carbon | 0.08 max | 0.05 max |
| Manganese | 0.35 max | 1.0 max |
| Phosphorus | 0.015 max | - |
| Sulfur | 0.015 max | 0.03 max |
| Silicon | 0.35 max | 0.5 max |
| Chromium | 17.0 - 21.0 | 19.5 - 23.5 |
| Nickel | 50.0 - 55.0 | 38.0 - 46.0 |
| Molybdenum | 2.80 - 3.30 | 2.5 - 3.5 |
| Columbium (Niobium) | 4.75 - 5.50 | - |
| Titanium | 0.65 - 1.15 | 0.6 - 1.2 |
| Aluminum | 0.20 - 0.80 | 0.2 max |
| Cobalt | 1.00 max | - |
| Boron | 0.006 max | - |
| Copper | 0.30 max | 1.5 - 3.0 |
| Tantalum | 0.05 max | - |
| Iron | Balance | 22.0 min |
Incoloy Alloy 825 vs Inconel Alloy 718 Mechanical Behavior
Incoloy 825 Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.14 g/cm3 | 1400 °C (2550 °F) | 690-1000Mpa | 330-880Mpa | 45% – 15% |
Inconel 718 Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.28 g/cm3 | 1390 °C (2540 °F) | 910Mpa | 550Mpa | 25% |
Incoloy Alloy 825 vs Inconel Alloy 718 Physical Properties
| Incoloy 825 | Inconel 718 | |
|---|---|---|
| Density, g/cm³ | 8.14 | 8.28 |
| Density, lb/in.³ | 0.305 | 0.296 |
| Melting Range, °F | 2550 | 2300-2437 |
| Melting Range, °C | 1400 | 1260-1336 |
| Permeability at 200 oersted (15.9 kA/m) | 1.005 | 1.0006 |
| Curie Temperature, °F | <-320 | -170 |
| Curie Temperature, °C | -196 | -112 |
Incoloy Alloy 825 vs Inconel Alloy 718 Main Standards
| Product Type | Incoloy 825 Standards | Inconel 718 Standards |
|---|---|---|
| Condenser and Heat Exchanger Tube | ASTM B163 | - |
| Seamless Pipe and Tube | ASTM B423, ASTM B829 | SAE AMS 5589, SAE AMS 5590 |
| Welded Pipe | ASTM B705, ASTM B775 | - |
| Welded Tube | ASTM B704, ASTM B751 | - |
| Welded Fittings | ASTM B366 | - |
| Rod and Bar | ASTM B425 | SAE AMS 5962 |
| Forgings | ASTM B564 | ASTM B637, SAE AMS 5662, SAE AMS 5663, SAE AMS 5664 |
| Plate, Sheet, and Strip | ASTM B424, ASTM B906 | ASTM B670, ASTM B906, SAE AMS 5596, SAE AMS 5597, SAE AMS 5950 |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Inconel alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of Inconel 718/incoloy 825 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 718/incoloy 825 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 718/incoloy 825, 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.
