IN 718 UNS N07718 Centri-Vac Nickel Cobalt Based Alloy,1

**Product Introduction: INCONEL® 718 (UNS N07718) Centri-Vac™ Nickel-Based Superalloy** **Overview** INCONEL® 718 (UNS N07718) is a precipitation-hardenable nickel-chromium superalloy containing significant amounts of niobium, molybdenum, and iron. The "Centri-Vac" designation typically refers to components manufactured through specialized centrifugal casting and vacuum melting processes, resulting in superior metallurgical quality and performance. This alloy is renowned for its exceptional combination of high strength, excellent corrosion resistance, and outstanding fabricability. A key advantage of Alloy 718 is its ability to be precipitation hardened to very high strength levels without post-weld heat treatment cracking, making it indispensable for the most demanding applications in aerospace, oil & gas, and power generation industries. --- **Chemical Composition (Typical % Weight)** | Element | Content (%) | Function | |---------|-------------|-----------| | Nickel (Ni) | 50.0-55.0 | Austenitic matrix former | | Chromium (Cr) | 17.0-21.0 | Oxidation & corrosion resistance | | Iron (Fe) | Balance | Solid solution strengthening | | Niobium (Nb) | 4.75-5.50 | Primary γ" strengthening phase (Ni3Nb) | | Molybdenum (Mo) | 2.80-3.30 | Solid solution strengthening | | Titanium (Ti) | 0.65-1.15 | γ' strengthening phase (Ni3Ti) | | Aluminum (Al) | 0.20-0.80 | γ' strengthening phase | | Cobalt (Co) | 1.00 max | Residual element | | Carbon (C) | 0.08 max | Carbide formation | | Boron (B) | 0.006 max | Creep strength enhancement | --- **Physical & Mechanical Properties** **Physical Properties:** - Density: 8.19 g/cm³ (0.296 lb/in³) - Melting Range: 1260-1336°C (2300-2440°F) - Thermal Expansion: 13.0 μm/m·°C @ 20-100°C - Thermal Conductivity: 11.4 W/m·K @ 100°C **Mechanical Properties (Aged Condition):** - Tensile Strength: 1240 MPa (180 ksi) min - Yield Strength (0.2% Offset): 1030 MPa (150 ksi) min - Elongation: 12% min - Hardness: 34-44 HRC --- **International Standards & Specifications** - **AMS 5383**: Investment castings, vacuum melted - **NACE MR0175/ISO 15156**: Qualified for sour service (H₂S environments) - **ASTM A494**: Standard specification for nickel alloy castings - **AMS 5662/5663**: Wrought bar and forgings equivalent - **ASME SB-637**: Pressure vessel component specification --- **Product Applications** **Aerospace & Defense:** - Jet engine turbine wheels and blades - Compressor cases and frames - Rocket engine turbopump components - Afterburner components **Oil & Gas:** - Downhole tool components (MWD/LWD) - Wellhead and Christmas tree components - Subsea equipment for HPHT wells - Valve bodies and trim for sour service **Power Generation:** - Gas turbine blades and disks - Nuclear reactor core components - High-temperature fasteners and bolts --- **Key Advantages** 1. **Exceptional High-Temperature Strength**: Maintains excellent mechanical properties up to 700°C (1300°F) 2. **Outstanding Weldability**: Unique resistance to strain-age cracking in welded conditions 3. **Superior Corrosion Resistance**: Excellent performance in oxidizing and reducing environments 4. **Sour Service Capability**: NACE MR0175 compliant for H₂S environments 5. **Excellent Fatigue & Creep Resistance**: Ideal for cyclic loading applications --- **Conclusion** INCONEL® 718 Centri-Vac alloy represents the pinnacle of nickel-based superalloy technology, combining unparalleled strength, corrosion resistance, and manufacturing versatility. Its unique precipitation hardening characteristics and exceptional weldability make it the material of choice for mission-critical components in aerospace propulsion, energy extraction, and power generation systems. The combination of AMS 5383 investment casting standards and NACE MR0175 sour service certification ensures the highest level of quality and reliability for components operating in the most extreme environments. *Note: INCONEL is a registered trademark of Special Metals Corporation. Centri-Vac is a proprietary manufacturing process.*

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3409 gallon liquid totes Special package is available on request.