Inconel 718
Excellent mechanical properties – tensile, fatigue, and creep rupture properties
Extremely high yield strength, creep strength, and fracture strength
Excellent resistance to chloride and sulfide stress corrosion cracking
Resistant to aqueous corrosion and chloride ion stress corrosion cracking
High temperature resistance
Age-hardenable, with unique slow aging response characteristics that allow for heating and cooling during annealing without the risk of cracking.
Excellent weldability and resistance to post-weld aging cracking.
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
- Send E-mail: ss@gneesteel.com
- Tel: +8615824687445
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 Description
Gnee Steel Inconel 718 Description
Inconel 600 (Nickel Alloy 600) is a standard engineering material suitable for applications requiring corrosion and high-temperature resistance. This alloy also possesses excellent mechanical properties, combining high strength with good workability.
The high nickel content enables Inconel 600 to resist corrosion from a wide range of organic and inorganic compounds and makes it virtually immune to chloride stress corrosion cracking. The chromium content ensures resistance to sulfide corrosion and provides oxidation resistance at high temperatures or in corrosive solutions. Inconel 600 cannot be strengthened by precipitation hardening; it can only be hardened and strengthened through cold working. The versatility of Inconel 600 makes it widely used in various fields, with a working temperature range from cryogenic temperatures to above 2000°F (1095°C).
Inconel 718 Available Shape
Inconel 718 Seamless Pipe
Inconel Alloy 718 Plate
Inconel 718 Pipe Fitting
Inconel Alloy 718 Bar
Inconel Alloy 718 ASTM Standard
| Form | Standard |
|---|---|
| Metal Type | UNS N07718 |
| Bar | ASTM B637, AMS 5662, AMS 5663, AMS 5664, PWA 1009, PWA 1010, GE BS01F15 |
| Sheet | ASTM B670, AMS 5596, AMS 5597, PWA 1033, GE BS01F14, ASTM B670, ASTM B637 |
| Plate | ASTM B670, AMS 5596, AMS 5597, PWA 1033, GE BS01F16, ASTM B670, ASTM B637 |
| Tube | AMS 5589, AMS 5690 |
| Pipe | AMS 5689, AMS 5690 |
Nickel 718 Alloy Specification
718 Alloy 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 Alloy 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 |
Alloy 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 | Precipitation Hardening (γ') | Solid Solution Strengthening | Solid Solution Strengthening |
| Max Service Temp. | ~700°C (for strength) | ~980°C (for corrosion) | ~425°C |
| Tensile Strength (Room Temp) | Very High (~1345 MPa) | High (~900 MPa) | Medium (~515 MPa) |
| Corrosion Resistance | Excellent | Superior (especially at >700°C) | Good |
| Weldability | Good (requires post-weld aging) | Excellent | Excellent |
| Cost | High | High | Low |
| Best For | High-strength components up to 700°C | Extreme corrosion, higher temps | General corrosion resistance |
Nickel Based Alloy 718 Packaging
GNEE Group Alloy 718 Product Packaging
inconel Alloy 718 Testing
GNEE Group Nickel Alloy 718 Testing
About Gnee Steel
Gnee Steel 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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