Views: 7 Author: Site Editor Publish Time: 2025-07-10 Origin: Site
Inconel 718 is a nickel-based high temperature alloy, mainly composed of nickel, chromium, iron and titanium. It has excellent oxidation resistance and can maintain stable mechanical properties at high temperatures. As a result, it is widely used in the manufacture of components in high temperature environments.
Another characteristic of the alloy is that the alloy organization is particularly sensitive to the thermal processing technology, mastery of the alloy phase precipitation and dissolution laws and organization and process performance of the interrelationship between the different. The use of the same requirements to develop a reasonable, feasible process procedures, you can get to meet the different strength levels and the use of a variety of parts required.
Shanghai Zhucheng Pipe Fittings Manufacturing Co Ltd. supply varieties of forgings, forging bars, rolled bars, cold rolled bars, round cake, ring, plate, belt, wire pipe and so on. Can be made into disk, ring blade. Shaft, fasteners and elastic elements, plate structure, magazine and other parts in the aviation long-term use.
Element | UNS N⁰7718(Formerly Grade |
Carbon | 0.08 max |
Manganese | 0.35 max |
Silicon | 0.35 max |
Phosphorus | 0.015 max |
Sulfur | 0.015 max |
Chromium | 17.0-21.0 |
Cobalt | 1.0 maxA |
Molybdenum | 2.80-3.30 |
Columbium (Nb)+ | 4.75-5.50 |
Titanium | 0.65-1.15 |
Aluminum | 0.20-0.80 |
Zirconium | … |
Boron | 0.006 max |
Iron | remainderB |
Copper | 0.30 max |
Nickel | 50.0-55.0 |
1. Unless otherwise specified, the material shall be supplied in the solution treated condition, suitable for subsequent age hardening.
2. The solution treated material shall be capable of meeting the mechanical property requirements of Table 3, and the stress rupture requirements of Table 4, following the precipitation hardening treatment described in Table 2.
3. When the material is to be supplied in the solution treated plus aged condition, the requirements of Table 3 and Table 4 shall apply, with the precipitation hardening treatment of Table 2, or as agreed upon between the purchaser and the manufacturer as part of the purchase contract.
Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation % in 2″ (50.8 mm) | Reduction Of Area (%) | Hardness (HBW) |
1275 min | 1034 min | 6 min | 8 min | 331 min |
Alloy | Recommended Solution | Precipitation Hardening |
UNS NO7718 | 1700 to 1850°F(924 to 1010°℃), | 1325±25°F(718±14°C),hold at temperature for |
✅ Outstanding high temperature strength: maintains excellent mechanical properties in environments up to 700°C.
✅ High corrosion resistance: suitable for harsh acidic, salt spray or high pressure corrosive environments.
✅ Good weldability: Inconel 718 is easier to weld and heat treat than many superalloys.
✅ High fatigue and creep resistance: suitable for parts subjected to alternating loads or long-term high-temperature operation.
Austenitic matrix (γ-phase): Nickel-based solid solution with a face-centered cubic (FCC) crystal structure.
Primary reinforcing phase (γ′′ phase): Ni3Nb, mainly niobium-based, with a body-centered tetragonal (D022) crystal structure. This phase is the key to the high strength and creep resistance of Inconel 718 at elevated temperatures.
Secondary reinforcing phase (γ′ phase): Ni3(Al,Ti) with a face-centered cubic (L12) crystal structure. Although its content is usually lower than that of the γ′′ phase, it also plays an important role in the strengthening of the alloy
δ-phase: Ni3Nb phase with orthorhombic crystal structure. The γ′′ phase is converted to the more stable δ phase under certain heat treatment conditions, especially during prolonged exposure to high temperatures. Although the δ phase can also provide strengthening, excessive precipitation can lead to a loss of toughness.
Carbides, such as NbC (niobium carbide), usually precipitate along grain boundaries and contribute to grain boundary strengthening, but excessive grain boundary carbides may affect toughness.
Inconel 718 heat resistant alloy has excellent corrosion resistance to a wide range of media. This corrosion resistance is similar to other nickel-chromium alloys and is determined by its composition. Nickel contributes to its corrosion resistance in a wide range of inorganic and organic compounds (except strong oxidizing compounds) with a wide range of pH.
It also helps prevent chloride ion stress corrosion cracking. Chromium gives it resistance to oxidizing media and attack by sulfur-containing compounds. Molybdenum, on the other hand, is believed to contribute to its resistance to pitting in a wide range of media.
Cold working should be carried out after solution treatment, Inconel 718 work hardening rate is greater than austenitic stainless steel, so
processing equipment should be adjusted accordingly, and in the cold working process should be intermediate annealing process.
Precipitation hardening type of Inconel718 alloy is very suitable for welding, no tendency to crack after welding. Weldability, easy to add
workability, high strength is the material's major advantages.
Inconel 718 is suitable for arc welding, plasma welding and so on. Before welding, the surface of the material should be clean, no oil,
no chalk marks, etc., the weld around the 25mm range should be polished to reveal the bright metal.
Aerospace: core components such as engine magazines, gas turbines, turbine disks, and compressor blades.
Oil and gas: downhole tools, pipeline connectors, high-pressure vessels.
Nuclear energy equipment: structural components under high temperature and pressure, anti-irradiation materials.
Chemical industry: heat exchangers, heaters, pumps, valves.
3D printing technology: for metal additive manufacturing technologies such as laser melting (SLM) and electron beam melting (EBM).
Inconel 718 alloy suitable hot working temperature of 1120-900 ℃, the cooling method can be water quenching or other rapid cooling methods, hot working should be promptly annealed to ensure that the best performance. Hot working material should be heated to the upper limit of the processing temperature, in order to ensure the plasticity of the processing, deformation of 20% of the final processing temperature should not be lower than 960 ℃.
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
- Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
If you need a metal material that maintains excellent performance in high-temperature, high-pressure, corrosive environments, Inconel 718 is the ideal choice. Whether it's in an aero-engine under extreme operating conditions or a highly corrosive chemical reactor, it's consistent, long-lasting and reliable.
If you are looking for a professional Inconel 718 material supplier, or would like to learn more about processing and application solutions, please feel free to contact us for technical support and a quote!
