Inconel 718
Key Features
- High Temperature Resistance: Maintains strength and oxidation resistance up to 700°C (1300°F).
- Excellent Corrosion Resistance: Performs well in harsh environments, including those with acids, salts, and seawater.
- Outstanding Strength: Offers superior tensile, fatigue, and creep resistance even after prolonged exposure to high temperatures.
- Good Weldability: Can be welded without cracking due to its balanced composition and hardening response.
- Long-Term Durability: Ideal for critical components where service life is essential under stress and heat.
Chemical Composition
Element | Composition (%) |
Nickel (Ni) | 50.0 – 55.0 |
Chromium (Cr) | 17.0 – 21.0 |
Iron (Fe) | Balance |
Niobium + Tantalum (Nb + Ta) | 4.75 – 5.50 |
Molybdenum (Mo) | 2.80 – 3.30 |
Titanium (Ti) | 0.65 – 1.15 |
Aluminum (Al) | 0.20 – 0.80 |
Cobalt (Co) | ≤ 1.00 |
Carbon (C) | ≤ 0.08 |
Manganese (Mn) | ≤ 0.35 |
Silicon (Si) | ≤ 0.35 |
Sulfur (S) | ≤ 0.015 |
Mechanical Properties
Property | Value |
Tensile Strength | ≥ 1240 MPa |
Yield Strength (0.2% Offset) | ≥ 1035 MPa |
Elongation | ≥ 12% |
Hardness | ~331 HB |
Operating Temperature Range | -253°C to 700°C |
Applications
- Aerospace Industry: Gas turbine engines, jet engine parts, rocket motors, and aircraft fasteners.
- Power Generation: Turbine blades, exhaust systems, and nuclear reactor components.
- Oil & Gas: Downhole tools, valves, and wellhead components.
- Marine Industry: High-pressure, corrosion-resistant parts exposed to seawater.
- Chemical Processing: Heat exchangers, reactors, and acid handling equipment.
Forms Available
- Sheets & Plates: Used in high-temperature structural components and cladding applications.
- Bars & Rods: Ideal for machining into custom components for aerospace and oil & gas sectors.
- Pipes & Tubes: Employed in high-pressure fluid transport systems across the power and chemical industries.
Equivalent Grades
Standard | Equivalent Grade |
UNS | N07718 |
W.Nr | 2.4668 |
AMS | 5662, 5663 |
ASTM | B637 |
Advantages
- Exceptional mechanical properties at cryogenic and high temperatures.
- Resists pitting, crevice corrosion, and stress-corrosion cracking.
- High fatigue strength and creep resistance.
- Suitable for high-stress environments requiring long-term reliability.
Surface Finish and Coatings
- Standard finishes include polished or pickled surfaces.
- Coatings such as epoxy or anti-corrosion layers can be applied for specific requirements.
Quality Assurance & Packaging
- Certifications: Compliant with ASTM B637, AMS 5662/5663, and other relevant standards.
- Packaging: Pipes and components are securely packaged with protective materials like wooden crates, plastic wrap, and end caps to prevent transit damage.
FAQ's
Its high tensile strength, fatigue resistance, and ability to perform at elevated temperatures make it ideal for turbine and jet engine components.
Inconel 718 offers higher strength due to precipitation hardening, whereas Inconel 625 is better suited for corrosion resistance without heat treatment.
Yes, it has excellent weldability and can be joined using standard techniques without risk of cracking.
Products
Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry