Alloy 718，Inconel 718 Forgings，UNS N07718，EFORU

British Specs:，American Specs: AMS 5662 Bar and Forgings AMS 5663 Bar and Forgings AMS 5664 Bar and Forgings AMS 5589 Seamless Tube AMS 5590 (Tube *) AMS 5596 Sheet, Strip and Plate AMS 5597 Sheet, Strip and Plate AMS 5832 Welding Wire AMS 5914 Sheet, Strip and Foil AMS 5950 (718SPF) Sheet & Strip ASTM F3055 Powder，German Specs:

### **Product Introduction: Alloy 718 / Inconel 718 Forgings (UNS N07718)** #### **Overview** **Alloy 718 Forgings** (commercially known as **Inconel® 718 Forgings**) represent the highest quality form of this premier nickel-chromium superalloy, engineered for the most demanding applications in extreme environments. The forging process refines the alloy's grain structure, enhances mechanical properties, and ensures superior metallurgical integrity throughout the component. Inconel 718 forgings deliver exceptional strength, outstanding fatigue resistance, and excellent creep rupture properties at temperatures up to 700°C (1300°F), making them indispensable for critical rotating and structural components across aerospace, power generation, and oil and gas industries. The forging process, combined with the alloy's unique precipitation-hardening capability through gamma double prime (γ'') phase formation, results in components with optimized grain flow, improved ductility, and enhanced resistance to crack propagation, ensuring reliable performance in safety-critical applications. --- #### **Chemical Composition** The chemical composition of Alloy 718 Forgings (UNS N07718) meets rigorous international standards: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 50.0 - 55.0 | | **Chromium (Cr)** | 17.0 - 21.0 | | **Iron (Fe)** | Balance | | **Niobium (Nb)** | 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 | | **Copper (Cu)** | ≤ 0.30 | | **Boron (B)** | ≤ 0.006 | *The optimized composition enables superior precipitation hardening response through gamma double prime [γ'' Ni₃Nb] and gamma prime [γ' Ni₃(Al,Ti)] phases during controlled heat treatment cycles.* --- #### **Physical Properties** Critical properties for forged component design and performance: | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.19 g/cm³ | 0.296 lb/in³ | | **Melting Range** | 1260 - 1336 °C | 2300 - 2440 °F | | **Specific Heat (20°C)** | 435 J/kg·K | 0.104 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 11.4 W/m·K | 79.1 Btu·in/hr·ft²·°F | | **Thermal Expansion Coefficient (20-100°C)** | 13.0 μm/m·°C | 7.2 μin/in·°F | | **Modulus of Elasticity** | 200 GPa | 29.0 x 10⁶ psi | | **Electrical Resistivity** | 1.25 μΩ·m | - | --- #### **Mechanical Properties** Enhanced mechanical properties achieved through controlled forging and heat treatment: **Solution Annealed + Aged Condition (Per AMS 5662):** * **Ultimate Tensile Strength:** 1275-1380 MPa (185-200 ksi) * **Yield Strength (0.2% Offset):** 1035-1170 MPa (150-170 ksi) * **Elongation:** 12-20% * **Reduction of Area:** 15-25% * **Hardness:** 35-45 HRC **Elevated Temperature Performance:** * **0.2% Yield Strength at 650°C (1200°F):** ≥ 895 MPa (130 ksi) * **Stress Rupture Life at 650°C (1200°F):** ≥ 100 hours at 690 MPa (100 ksi) * **Creep Resistance:** Excellent up to 700°C (1300°F) --- #### **International Standards** Alloy 718 Forgings comply with stringent international specifications: **Aerospace Material Specifications:** * **AMS 5662:** Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings * **AMS 5663:** Solution Heat Treated and Aged * **AMS 5664:** Solution Heat Treated and Overaged **ASTM Standards:** * **ASTM B637:** Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock * **ASTM B564:** Standard Specification for Nickel Alloy Forgings **Quality & Testing Standards:** * **AMS 2269:** Chemical Check Analysis Limits * **ASTM E112:** Grain Size Determination * **ASTM A388:** Ultrasonic Examination of Heavy Steel Forgings --- #### **Product Applications** Alloy 718 forgings serve in the most critical applications across industries: **Aerospace & Defense:** * **Gas Turbine Engines:** Turbine disks, compressor disks, shafts, blades, and spacers * **Rocket Systems:** Turbopump components, thrust chambers, nozzle parts * **Aircraft Structures:** Landing gear components, engine mounts, wing fittings **Oil & Gas Industry:** * **Downhole Tools:** Drill collars, subs, hangers, and mandrels * **Wellhead Equipment:** Valve bodies, flanges, Christmas tree components * **Subsea Systems:** Connectors, manifold blocks, pressure housings **Power Generation:** * **Gas Turbines:** Rotor disks, blade rings, shaft components * **Nuclear Plants:** Reactor core components, control rod mechanisms * **Steam Turbines:** High-pressure rotor sections, valve stems **Industrial Applications:** * **Chemical Processing:** Reactor vessels, agitator shafts, valve bodies * **Marine Engineering:** Propeller shafts, submarine components * **High-Temperature Fasteners:** Large bolts, studs, and special fasteners --- #### **Key Advantages** * **Superior Grain Structure:** Refined, uniform grain size with optimized grain flow * **Enhanced Mechanical Properties:** Improved strength, ductility, and toughness compared to cast products * **Excellent Fatigue Resistance:** Superior performance under cyclic loading conditions * **Improved Reliability:** Reduced incidence of internal defects and improved structural integrity * **Superior Stress Rupture Properties:** Enhanced creep and stress rupture life at elevated temperatures * **Better Microstructural Control:** Controlled precipitation and phase distribution * **Optimized Grain Flow:** Grain structure aligned with component stress patterns * **Reduced Anisotropy:** More uniform properties in all directions **Note:** *Inconel® is a registered trademark of Special Metals Corporation, a PCC company. Alloy 718 forgings are typically supplied in the solution treated and aged condition (STA) with comprehensive certification including chemical analysis, mechanical properties, microstructural examination, and non-destructive testing reports. Special quality requirements such as enhanced ultrasonic testing, grain size control, and delta phase control are available to meet specific application demands.*

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 1789 gallon liquid totes Special package is available on request.