Project Description
N07718 (Inconel 718) Nickel-Based Superalloy
UNS N07718 | High-Temperature Corrosion Resistant Alloy | Premium Quality from SHUNFU METAL
Introduction to N07718 Nickel Superalloy
N07718, commercially known as Inconel 718, is a precipitation-hardenable nickel-chromium superalloy that has become the industry standard for high-performance applications requiring exceptional strength, corrosion resistance, and thermal stability. As a leading manufacturer of specialty alloys, SHUNFU METAL offers this premium superalloy in various product forms to meet the demanding requirements of aerospace, oil and gas, nuclear, and chemical processing industries.
This nickel-based superalloy contains approximately 50-55% nickel, 17-21% chromium, and significant additions of niobium, molybdenum, and titanium. The unique combination of these alloying elements provides N07718 with outstanding mechanical properties at temperatures ranging from cryogenic levels up to 704°C (1300°F). The alloy derives its exceptional strength primarily from the precipitation of gamma double prime (γ″) phase, which is a body-centered tetragonal Ni₃Nb compound.
At SHUNFU METAL, we manufacture N07718 using advanced melting processes including Vacuum Induction Melting (VIM), Vacuum Arc Remelting (VAR), and Electroslag Remelting (ESR) to ensure the highest purity and homogeneous microstructure. Our state-of-the-art facilities and rigorous quality control systems guarantee that every product meets or exceeds international specifications. We welcome bulk orders and offer competitive pricing for large volume purchases.
Key Features of N07718
Exceptional High-Temperature Strength
Maintains excellent tensile, fatigue, creep, and rupture strength at temperatures up to 704°C with outstanding oxidation resistance.
Superior Corrosion Resistance
Excellent resistance to oxidation, sulfidation, and various corrosive environments including chloride and acidic media.
Good Weldability
Unlike many precipitation-hardened superalloys, N07718 exhibits excellent weldability and resistance to post-weld cracking.
Cryogenic Properties
Retains high strength and toughness at cryogenic temperatures, making it suitable for liquefied gas applications.
Applications of N07718 Superalloy
The exceptional combination of mechanical properties and corrosion resistance makes N07718 the material of choice for critical components across multiple high-performance industries. SHUNFU METAL supplies N07718 to manufacturers worldwide for the following applications:
Oil and Gas Industry
N07718 is extensively used in downhole tools, wellhead components, and subsea equipment where exposure to corrosive fluids containing hydrogen sulfide and carbon dioxide is common. The alloy’s resistance to sulfide stress cracking and chloride-induced stress corrosion cracking makes it ideal for sour gas environments.
- Drill collars and drilling tools
- Wellhead and Christmas tree components
- Subsea connectors and fasteners
- Downhole packers and completion equipment
Aerospace Industry
In aerospace applications, N07718 is the most widely used superalloy for jet engine components due to its outstanding high-temperature performance and reliability. The alloy is used in both rotating and static components operating at elevated temperatures.
- Gas turbine disks and shafts
- Compressor blades and vanes
- Combustion chamber components
- Thrust reversers and exhaust systems
Power Generation
The superalloy finds extensive use in land-based gas turbines, nuclear reactors, and other power generation equipment requiring exceptional high-temperature performance and long service life.
Other Applications
- Cryogenic storage tanks and equipment
- Chemical processing equipment
- Rocket motors and spacecraft components
- Nuclear fuel element spacers
N07718 Standards and Equivalent Grades
As a professional manufacturer, SHUNFU METAL produces N07718 superalloy in compliance with major international specifications. Our products meet the stringent requirements of aerospace, oil and gas, and nuclear industry standards.
Applicable Standards
| Standard Organization | Specification Number | Product Form |
|---|---|---|
| UNS | N07718 | All Forms |
| ASTM | B637, B670 | Bar, Rod, Forgings |
| AMS | 5662, 5663, 5664, 5596 | Bar, Forgings, Sheet |
| API | API 6ACRA | Oil & Gas Components |
| NACE | MR0175 / ISO 15156 | Sour Service |
| DIN / EN | 2.4668 (NiCr19Fe19Nb5Mo3) | All Forms |
| ISO | ISO 15156-3 | Sour Service Applications |
| GB (China) | GH4169 | All Forms |
Equivalent Designations
Trade Names: Inconel 718, Allvac 718, Udimet 718, Haynes 718, Nicrofer 5219 Nb
Werkstoff Number: 2.4668
Chinese Grade: GH4169
N07718 Chemical Composition
The chemical composition of N07718 is carefully controlled to achieve optimal mechanical properties and corrosion resistance. SHUNFU METAL ensures strict adherence to the following composition limits:
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Columbium + Tantalum (Cb+Ta) | 4.87 – 5.20 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.80 – 1.15 |
| Aluminum (Al) | 0.40 – 0.60 |
| Carbon (C) | 0.045 max |
| Cobalt (Co) | 1.00 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Phosphorus (P) | 0.010 max |
| Sulfur (S) | 0.010 max |
| Boron (B) | 0.0060 max (60 ppm) |
| Copper (Cu) | 0.23 max |
| Lead (Pb) | 0.0010 max (10 ppm) |
| Selenium (Se) | 0.0005 max (5 ppm) |
| Bismuth (Bi) | 0.00005 max (0.5 ppm) |
| Calcium (Ca) | 0.0030 max (30 ppm) |
| Magnesium (Mg) | 0.0060 max (60 ppm) |
Note: All compositions are in weight percent (wt%). Balance is Iron.
N07718 Available Sizes and Forms
As a dedicated manufacturer, SHUNFU METAL offers N07718 superalloy in a comprehensive range of sizes and product forms. We maintain regular stock of common dimensions and welcome custom orders for special requirements.
Forged Round Bars
Diameter: 80mm – 1200mm
Length: As per customer requirements
Condition: Forged, heat treated
Rolled Round Bars
Diameter: 10mm – 300mm
Length: 2000mm – 12000mm
Condition: Hot rolled, solution annealed
Additional Product Forms
- Hollow bars and tubes (pre-drilled or bored)
- Flat bars and plates
- Square and rectangular sections
- Custom forgings to customer drawings
Common sizes available from stock! Contact SHUNFU METAL for availability and lead times. Custom dimensions accepted for bulk orders.
N07718 Heat Treatment Procedures
Proper heat treatment is essential to develop the optimal mechanical properties of N07718. SHUNFU METAL provides complete heat treatment services using precisely controlled furnaces to meet customer specifications.
Melting Process Sequences
UNS N07718 shall be manufactured using one of the following process sequences:
Option A:
- Step 1: Basic Electric Furnace (EF)
- Step 2: Either Argon Oxygen Decarburization (AOD) or Vacuum Oxygen Decarburization (VOD)
- Step 3: Vacuum Arc Remelting (VAR)
- Step 4: VAR (second melt)
Option B:
- Step 1: Vacuum Induction Melting (VIM)
- Step 2: Either Electroslag Remelting (ESR), Electroflux Remelting (EFR), or VAR
- Optional Step 3: ESR, EFR, or VAR
Solution Annealing and Age Hardening
| Material Designation | Solution Annealing Temperature | Time (hours) | Age Hardening |
|---|---|---|---|
| 120K | 1870°F – 1925°F (1021°C – 1052°C) | 1 to 2.5 | 1425°F – 1475°F (774°C – 802°C) for 6-8 hours |
| 140K | 1870°F – 1925°F (1021°C – 1052°C) | 1 to 2.5 | 1400°F – 1475°F (760°C – 802°C) for 6-8 hours |
Note: Cooling from solution annealing temperature shall be air cool or faster. Age hardening is followed by air cooling.
N07718 Mechanical Properties
N07718 exhibits outstanding mechanical properties after proper heat treatment. The following tables present the minimum requirements as specified in API 6ACRA and related standards.
Tensile Requirements
| Material | QTC Thickness in. (mm) | 0.2% Yield Min. ksi (MPa) | 0.2% Yield Max. ksi (MPa) | Tensile Min. ksi (MPa) | Elongation 4D Min. % | Reduction of Area Min. % |
|---|---|---|---|---|---|---|
| 120K | ≤10 (254) | 120 (827) | 145 (1000) | 150 (1034) | 20 | 35 |
| >10 (254) | 120 (827) | 145 (1000) | 150 (1034) | 20 | 25 | |
| 140K | ≤10 (254) | 140 (965) | 150 (1034) | 165 (1138) | 20 | 35 |
| >10 (254) | 140 (965) | 150 (1034) | 160 (1103) | 20 | 25 |
Charpy V-Notch Impact Toughness Requirements (10mm x 10mm)
| Material | QTC Thickness in. (mm) | Orientation | Min. Average ft-lbs (J) | Min. Single ft-lbs (J) | Min. Lateral Expansion in. (mm) |
|---|---|---|---|---|---|
| 120K | <3 (76) | Longitudinal | 50 (68) | 45 (61) | 0.015 (0.38) |
| ≥3 (76) through 10 (254) | Transverse | 35 (47) | 30 (41) | 0.015 (0.38) | |
| >10 (254) | Transverse | 30 (41) | 27 (37) | 0.015 (0.38) | |
| 140K | <3 (76) | Longitudinal | 50 (68) | 45 (61) | 0.015 (0.38) |
| ≥3 (76) through 10 (254) | Transverse | 35 (47) | 30 (41) | 0.015 (0.38) | |
| >10 (254) | Transverse | 30 (41) | 27 (37) | 0.015 (0.38) |
Hardness Requirements
| Material Designation | Minimum Hardness HRC (HBW) | Maximum Hardness HRC (HBW) |
|---|---|---|
| 120K | 32 (*) | 40 (*) |
| 140K | 34 (*) | 40 (*) |
(*) HBW values are approximate equivalents.
Machining and Processing Services
SHUNFU METAL offers comprehensive machining and processing services to deliver N07718 products ready for your application. Our advanced manufacturing facilities are equipped with precision equipment to handle the challenging machinability characteristics of this superalloy.
Precision Turning
CNC turning and bright finishing to achieve tight dimensional tolerances and superior surface finish for demanding applications.
Deep Hole Boring
BTA deep hole boring and gun drilling capabilities for producing hollow bars with precise ID tolerances and excellent concentricity.
Thread Machining
API and premium connection threading services including proprietary thread forms for oil and gas applications.
Surface Treatment
Shot peening, roller burnishing, and surface hardening treatments to enhance fatigue life and wear resistance.
Quality Assurance
As a certified ISO 9001 manufacturer, SHUNFU METAL maintains rigorous quality control throughout the manufacturing process. Every N07718 product undergoes comprehensive testing and inspection before shipment.
Testing and Certification
- Chemical analysis by optical emission spectrometry (OES)
- Mechanical testing including tensile, impact, and hardness
- Ultrasonic testing (UT) per ASTM A388 or equivalent
- Magnetic particle inspection (MPI) and liquid penetrant testing (PT)
- Macro and microstructure examination
- Dimensional inspection with full traceability
All products are supplied with Mill Test Certificates (MTC) in accordance with EN 10204 3.1 or 3.2 as required.
Partner with SHUNFU METAL for Your N07718 Requirements
As a professional manufacturer of high-quality superalloys, we offer competitive pricing, reliable supply, and exceptional technical support. We welcome bulk orders and provide dedicated service for long-term partnerships.
Phone: +86-731-89903933 | Email: [email protected]
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
