What are the differences between Inconel 783 and 718 alloys?
What are the differences between Inconel 783 and 718 alloys?
Both Inconel 783 and 718 are nickel-based superalloys, but 783 is specifically designed for certain turbine applications. Due to its higher aluminum content, it has a lower coefficient of thermal expansion and better oxidation resistance. This makes it less dense, about 5% lighter than Inconel 718.
How to weld Inconel 718?
Inconel 718 can be welded in either the annealed or precipitation-hardened state. For many non-aerospace applications, the only heat treatment required after welding is aging at 1325/1150°F (700/570°C) to enhance the strength of the weld and the base material near the fusion line.
Inconel 783 Chemical Composition
| Element | Content |
|---|---|
| S (Sulfur) | ≤ 0.005% |
| C (Carbon) | ≤ 0.03% |
| P (Phosphorus) | ≤ 0.015% |
| Al (Aluminum) | 5.00% – 6.00% |
| Cu (Copper) | ≤ 0.50% |
| Nb (Niobium) | 2.50% – 3.50% |
| Fe (Iron) | 24.0% – 27.0% |
| Ni (Nickel) | 26.0% – 30.0% |
| Si (Silicon) | ≤ 0.50% |
| Mn (Manganese) | ≤ 0.50% |
| B (Boron) | 0.003% – 0.012% |
| Ti (Titanium) | ≤ 0.40% |
| Co (Cobalt) | ≥ 28.0% |
| Ta (Tantalum) | ≤ 0.05% |
| Cr (Chromium) | 2.5% – 3.5% |
Inconel 783 Physical Properties
| Density | g/cm3 | 7.81 | |
|---|---|---|---|
| lb/in.3 | 0.282 | ||
| Melting Range | °F | 2437 - 2565 | |
| °C | 1336 - 1407 | ||
| Specific Heat (21°C) | Btu/lb-°F | 0.109 | |
| J/kg-°C | 455 | ||
Inconel 783 Mechanical Properties
| Test Temperature | Yield Strength | Tensile Strength | Elongation | Reduction of Area | |||
|---|---|---|---|---|---|---|---|
| °F | °C | ksi | MPa | ksi | MPa | % | % |
| 70 | 21 | 113.0 | 779 | 171.0 | 1194 | 24 | 44 |
| 800 | 427 | 104.0 | 717 | 156.0 | 1076 | 25 | 42 |
| 1000 | 538 | 99.5 | 686 | 150.0 | 1034 | 25 | 46 |
| 1200 | 649 | 99.0 | 683 | 142.0 | 979 | 28 | 39 |
| 1300 | 704 | 88.0 | 607 | 117.0 | 807 | 39 | 64 |
Alloy 718 Chemical composition (Wt %)
| Carbon(C) | Manganes(Mn) | Phosphorus(P) | Sulfur(S) | Silicon(Si) | Nickel(Ni) | Cobalt(Co) |
| 0.045 Max | 0.35 Max | 0.010 Max | 0.010 Max | 0.35 Max | 50.0-55.0 | 1.00 Max |
| Chromium(Cr) | Manganese(Mo) | Niobium + Tantalum(Nb (Cb) + Ta) | Titanium(Ti) | Copper(Cu) | Aluminum(Al) | Iron (Fe) & Others |
| 17.0-21.0 | 2.8-3.30 | 4.87 -5.20 Max | 0.80-1.15 | 0.23 Max | 0.40-0.60 | Fe– Balance, B-0.0060, Pb– 0.0010 Max, Se-0.0005 Max, Bi-0.00005 Max, Ca0.0030 Max, Mg-0.0060 Max |
Mechanical Properties of Alloy 718
| Ultimate Tensile Strength (N/mm²) | Proof Stress (N/mm²) | Elongation (%) | Hardness (HB) |
|---|---|---|---|
| 1034 | 827 | 17 | 313-354 |
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 718 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 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, 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.
