What are the differences between Inconel 713C and Inconel 718?
What are the differences between Inconel 713C and Inconel 718?
The main difference between Inconel 713C and Inconel 718 lies in their optimal operating temperatures and processing methods: Inconel 713C is a nickel-chromium casting alloy optimized for extremely high-temperature creep resistance (>900°C), while Inconel 718 is an age-hardening alloy optimized for high strength and excellent weldability/machinability at moderate temperatures (up to ~700°C).
What is Inconel 713C?
Inconel 713C is a nickel-chromium casting alloy with excellent fracture strength at 1700°F (927°C), along with superior resistance to thermal fatigue and good casting properties. This datasheet provides information on its composition, physical properties, hardness, tensile properties, and creep and fatigue properties.
1. Comparison table of Inconel 713C and Inconel 718 alloys
| Feature | Inconel 713C | Inconel 718 |
| Common Form | Casting / Master Alloy Stick | Bar, Forging, Sheet, Pipe |
| Key Strengthening Element | Al (approx. 6%) & Ti | Nb (approx. 5%) |
| Max Service Temp | 1800°F (982°C) | 1200°F (650°C) |
| Primary Advantage | Exceptional Creep Resistance | High Tensile & Fatigue Strength |
| Standard Spec | AMS 5391 | AMS 5662 / AMS 5666 |
2. Comparison of chemical composition (weight percentage) of Inconel 713C and Inconel 718
| Element | Inconel 713C (Cast) | Inconel 718 (Wrought) | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance (~70-75) | 50.0 – 55.0 | 713C much higher Ni |
| Chromium (Cr) | 11.0 – 14.0 | 17.0 – 21.0 | 718 higher Cr |
| Iron (Fe) | ≤ 2.0 | Balance (~18-20) | 718 has much higher Fe |
| Molybdenum (Mo) | 3.5 – 5.0 | 2.80 – 3.30 | 713C higher Mo |
| Niobium (Nb) | 1.5 – 2.5 | 4.75 – 5.50 | 718 much higher Nb |
| Titanium (Ti) | 0.4 – 1.0 | 0.65 – 1.15 | Similar |
| Aluminum (Al) | 5.5 – 6.5 | 0.20 – 0.80 | 713C much higher Al |
| Carbon (C) | 0.05 – 0.15 | ≤ 0.08 | 713C higher |
| Cobalt (Co) | ≤ 1.0 | ≤ 1.00 | Similar |
| Manganese (Mn) | ≤ 0.20 | ≤ 0.35 | – |
| Silicon (Si) | ≤ 0.50 | ≤ 0.35 | – |
| Boron (B) | 0.005 – 0.015 | 0.002 – 0.006 | 713C higher B |
| Zirconium (Zr) | 0.05 – 0.15 | – | 713C unique |
| Copper (Cu) | – | ≤ 0.30 | – |
| Tantalum (Ta) | – | ≤ 0.05 | – |
Click to download the Inconel 713C alloy PDF file now
3. Physical properties of Inconel 713C and Inconel 718
| Property | Inconel 713C (Cast) | Inconel 718 (Wrought) |
|---|---|---|
| Density | 7.91 g/cm³ | 8.19 g/cm³ |
| Melting Range | 1260 – 1315°C | 1260 – 1336°C |
| Thermal Conductivity (20°C) | 11.2 W/m·K | 11.4 W/m·K |
| Coefficient of Thermal Expansion (20-100°C) | 12.0 × 10⁻⁶/°C | 13.0 × 10⁻⁶/°C |
| Coefficient of Thermal Expansion (20-800°C) | ~14.0 × 10⁻⁶/°C | ~15.5 × 10⁻⁶/°C |
| Specific Heat (20°C) | 450 J/kg·K | 435 J/kg·K |
| Modulus of Elasticity (20°C) | ~205 GPa | ~200 GPa |
| Electrical Resistivity | 1.30 µΩ·m | 1.25 µΩ·m |
| Magnetic Properties | Non-magnetic | Slightly magnetic |
4. Application Classification of Inconel 713C and Inconel 718: Blades vs. Rotor Discs
To understand these alloys, it's essential to understand their applications in engines:
Inconel 713C (King of Blades): Blades and guide vanes are directly exposed to the flames in the combustion chamber. They need to resist tensile (creep) temperatures up to 1800°F (982°C). 713C's cast construction and high-temperature stability make it a standard material for turbine blades and integral rotors.
Inconel 713C alloy for aerospace blades
Inconel 718 (King of Rotor Discs): Turbine rotor discs (the hubs that carry the blades) rotate at extremely high speeds. They withstand temperatures lower than blades (typically below 1200°F/650°C) but must withstand enormous centrifugal stress and fatigue. As a forged alloy, 718 possesses the high tensile strength and fracture toughness required for the "skeleton" of these structures.
Inconel 713C Alloy for Aerospace Wheels
5. How to choose between Inconel 713C and Inconel 718?
If you require high strength and resistance to high-temperature corrosion (e.g., for turbine blades) and can overcome casting difficulties, choose Inconel 713C.
If you require high strength, excellent weldability, and suitability for medium-temperature applications, choose Inconel 718.
Contact us to customize Inconel 713C products to fit your project dimensions
6. Why choose Gnee Alloy, a supplier of first-class high-temperature alloys?
In the nickel alloy market, supply chain stability is just as important as metallurgy.
✅️Ready-to-Ship Inventory: We maintain significant stock of Inconel 713C master alloy sticks (AMS 5391) and Inconel 718 bars to eliminate lead-time bottlenecks in your production.
✅️Bulk Pricing Advantage: Our direct-from-mill relationships allow us to offer highly competitive Bulk Pricing for large-scale aerospace and energy projects.
✅️VIM Quality Assurance: All our 713C is Vacuum Induction Melted (VIM) to ensure the ultra-low gas content required for the highest casting yields.
Gnee Steel inconel 713C Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel 713C Alloy Product Packing
Contact us for the latest export price quote for inconel 713C Alloy
FAQ
Q: Can I use Inconel 718 for a turbocharger turbine wheel?
A: No. A turbocharger wheel often operates at 900°C+. At that temperature, Inconel 718 would lose its strength almost immediately. You must use Inconel 713C for its high-temperature creep resistance.
Q: Which alloy is easier to weld?
A: Inconel 718 is famous for its excellent weldability. Inconel 713C, however, is considered virtually unweldable due to its susceptibility to strain-age cracking.
Q: Do you provide MTC (Material Test Certificates)?
A: Absolutely. Every shipment includes a full MTC 3.1 with chemical analysis and physical property verification, ensuring full traceability for aerospace audits.
