Inconel 718
Applicable Standards: ASTM B444, ASTM B637, ASME SB444
UNS Number: N07718
W.Nr. Number: 2.4668
Available Delivery Forms: Round tubes, plates, bars，Pipe Fitting，custom special machined components
Optional Surface Treatments: Solution annealing, pickling and passivation, bright grinding, mirror polishing, sandblasting
Production Processes: Hot forging, hot extrusion, cold rolling, cold drawing, precision CNC machining
Shipping Package：Sealed export wooden pallets with moisture-proof and anti-rust protection
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
- Send E-mail: ss@gneesteel.com
Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of inconel 718 in China. If you're going to wholesale high quality inconel 718 made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
Inconel 718 Product Description
Inconel 718 (UNS N07718) is a high-strength, corrosion-resistant nickel-chromium superalloy designed for extreme environments. It is a precipitation-hardening alloy that maintains high creep rupture strength at temperatures up to 700°C (1300°F). Inconel 718 is renowned for its excellent weldability and resistance to post-weld cracking, and is widely used in the aerospace, oil and gas, and power generation industries.
As a professional supplier of Inconel 718, GNEE STEEL maintains full-range ready stock. Custom tubes, plates, pipe fittings and round bars are available on demand, supported by dedicated CNC machining and surface treatment services. Scroll down to view real product photos and full specification details.
Inconel 718 Available Shape
Inconel 718 Seamless Pipe
Inconel 718 Plate
Inconel 718 Pipe Fitting
Inconel 718 Bar
Inconel 718 ASTM Standard
| Products | ASTM Standards |
|---|---|
| Sheets, plates, strips | ASTM B670 |
| Seamless tubes | ASTM B983 |
| Sticks, cakes | ASTM B637 |
Inconel 718 Specification
Inconel 718 Chemical Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | Balance |
| Nickel, Ni | 50.0 – 55.0 |
| Chromium, Cr | 17.0 – 21.0 |
| Niobium, Nb | 4.7 – 5.5 |
| Molybdenum, Mo | 2.8 – 3.3 |
| Cobalt, Co | ≤ 1.0 |
| Titanium, Ti | 0.65 – 1.15 |
| Manganese, Mg | ≤ 0.35 |
| Phosphorus, P | ≤ 0.35 |
| Copper, Cu | ≤ 0.3 |
| Aluminum, Al | 0.2 – 0.8 |
| Carbon, C | ≤ 0.08 |
| Sulfur, S | ≤ 0.015 |
Inconel 718 Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.192 g/cm3 | 0.296 lb/in3 |
| Melting Range | 1370-1430°C | 2500-2600°F |
| Specific Gravity | 8.19 | 8.19 |
Inconel 718 Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile Strength, Ultimate | 1375 MPa | 199000 psi |
| Tensile Strength, Yield | 1100 MPa | 160000 psi |
| Elongation at Break | 25% | 25% |
Corrosion Resistance of Inconel 718
Inconel 718 alloy exhibits excellent corrosion resistance to a variety of media.
This corrosion resistance is similar to that of other nickel-chromium alloys and is closely related to its composition.
Nickel helps improve the alloy's corrosion resistance to many inorganic and organic compounds (except strong oxidizing compounds) across a wide range of pH values. It also helps prevent stress corrosion cracking caused by chloride ions.
Chromium provides the alloy with resistance to oxidizing media and sulfide attack. Molybdenum helps improve the alloy's resistance to pitting corrosion in various media.
Fabrication and Heat Treatment of Inconel 718
Machinability
Inconel 718 alloy can be machined using conventional machining techniques used for iron-based alloys.
Formability
This alloy has good ductility and can therefore be formed using all conventional methods.
Weldability
Inconel 718 alloy can be welded using methods such as tungsten inert gas welding, shielded metal arc welding, submerged arc welding, and gas metal arc welding.
Heat Treatment
This alloy is age-hardenable and can be heat treated at 1900°F (1038°C) followed by air cooling.
Forging
The forging temperature range for Inconel 718 alloy is 1700 to 2050°F (927 to 1121°C).
Hot Working
This alloy can be hot worked in the temperature range of 1650 to 2050°F (899 to 1121°C).
Cold Working
This alloy can be cold worked using standard tools.
Annealing
Inconel 718 alloy can be annealed at 1900°F (1038°C) followed by air cooling.
Hardening
This alloy can be hardened using cold working techniques.
Applications of Inconel 718
Offshore oil drilling industry
Pharmaceutical equipment
Heat Exchangers
Pulp and Paper industry
Nuclear Plant
Petrochemical products
Aerospace
Jet engine components (compressor blades, discs, shafts)
Turbine rotors and casings
Aircraft and spacecraft fasteners and structural components
Power Generation
Gas turbine components
Steam turbine bolts and shafts
High-temperature fasteners for nuclear and fossil fuel power plants
Oil and Gas
Downhole tools and completion equipment
Wellhead components
Subsea equipment exposed to high pressure and corrosive environments
Marine and Offshore Engineering
Pump shafts and valve components
Hardware suitable for corrosive seawater environments
Industrial Applications
High-strength fasteners and springs
Cryogenic system components
Heat treatment fixtures requiring high strength at high temperatures
Inconel 718 vs Other Alloys
| Property | Inconel 718 (Age-Hardened) | Inconel 625 (Annealed) | 316L Stainless Steel (Annealed) |
|---|---|---|---|
| Primary Strengthening Mechanism | Precipitation hardening via γ'' intermetallic precipitates | Solid-solution strengthening by Mo & Nb alloy elements | Solid-solution strengthening by Cr & Ni alloy elements |
| Long-term Maximum Service Temperature (Mechanical Integrity) | 700 ℃ (retains design creep strength) | 980 ℃ (stable oxidation & corrosion resistance) | 425 ℃ (no carbide precipitation degradation) |
| Room Temperature Ultimate Tensile Strength | 1345 MPa minimum | 896 MPa minimum | 515 MPa minimum |
| High-temperature & Chloride Corrosion Performance | Resists H₂S, chloride SCC; slight strength drop above 700℃ | Zero chloride SCC risk; stable passivation layer up to 980℃ | Resists mild acid corrosion; prone to SCC under high chloride + tensile stress |
| Welding Performance & Post-Weld Treatment | Weldable via GTAW/GMAW; mandatory aging heat treatment to recover full tensile strength | Weldable via all standard processes; no post-weld heat treatment required | Weldable via all standard processes; post-weld pickling recommended only |
| Relative Raw Material Cost Index (316L = 1 Base) | 7.2 | 6.8 | 1.0 |
| Core Target Application Scenarios | Load-bearing structural parts requiring high tensile & creep strength below 700℃ | Components operating in high-temperature + severe corrosive media over 700℃ | General low-to-medium corrosion equipment under 425℃ service temperature |
Price of Inconel 718
| Product Form | Size Range | Minimum Order Quantity | FOB Unit Price (USD/kg) | Price Influencing Factors |
|---|---|---|---|---|
| Solution Treated Round Bars (Bright / Black Forged Bars) | φ6mm ~ φ300mm | 10kg | 34.5 ~ 46.8 | Unit price rises for smaller diameters; Age hardening heat treatment adds an extra 4–6 USD/kg |
| Hot Rolled / Cold Rolled Plates | 0.8mm ~ 120mm thickness | 30kg | 29.2 ~ 39.7 | Thin plates (＜3mm) carry high cold rolling processing premium; Thick forged plates have lower unit prices |
| Seamless Pipes ASTM B444 | NPS 1/8" ~ NPS 24", SCH 5S / 10S / 40S | 30kg | 38.6 ~ 52.3 | Thin-wall seamless pipes cost more due to extrusion process; Welded pipes are 10%–15% cheaper |
| Stamped Pipe Fittings (Elbows, Tees, Flanges) | Standard piping dimensions | 50kg | 43.0 ~ 60.5 | Custom forged special-shaped fittings & flanges bring significant processing surcharges |
Inconel 718 Packaging
Packaged using waterproof paper and steel strapping, meeting standard export requirements for sea freight and suitable for various modes of transport; packaging can also be customized according to client specifications.
Standard Export Packaging for Inconel 718:
1. Strapped bundling;
2. Wooden crate packaging; Wooden pallet packaging;
3. Containerized or bulk shipment;
4. Customized according to client requirements.
GNEE STEEL Inconel 718 Product Packaging
inconel 718 Testing
GNEE STEEL Inconel 718 Testing
About Gnee Steel
Gnee Alloy is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneesteel.com to obtain a quotation.
FAQ
Q: What is 718 Inconel?
A: Inconel 718 is a high-strength, corrosion-resistant nickel-based superalloy. It possesses excellent mechanical properties, high-temperature strength, and resistance to oxidation and corrosion. Inconel 718 is widely used in various industries, including aerospace, oil and gas, automotive, and power generation.
Q: Can Inconel 718 be welded?
A: Inconel 718 alloy exhibits excellent weldability in both age-hardened and annealed states. However, despite its strong resistance to strain-age cracking, some welding problems still exist, such as microcracks and solidification cracks.
Q: Does Inconel 718 work harden?
A: Due to its high toughness, low thermal conductivity, and susceptibility to work hardening, Inconel 718 is an extremely difficult material to machine. Furthermore, as a material prone to work hardening, Inconel 718 undergoes multiple plastic deformations during machining.
Q: At what temperature does Inconel 718 oxidize?
A: Inconel 718 begins to deform under its own weight at a temperature of approximately 1540 K. At 1560 K, deep grooves appear on the material's surface. At temperatures of 1173 K and below, Inconel 718 undergoes a brief oxidation process after approximately 24 hours of exposure to air.
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