In high-performance engineering, Inconel 718 (GH4169) is often referred to as the "king of superalloys." However, even the king has its limits. For engineers and purchasing managers, one of the most costly mistakes is using 718 in environments exceeding 750°C (1382°F).
Failure Mode: Inconel 718 is a precipitation-hardening forged alloy. Once the temperature exceeds 750°C, its strengthening phase (γ′′) begins to dissolve or transform. The material undergoes rapid overaging, loses structural stiffness, and sags like a soft metal under load.
Solution: For environments with temperatures ranging from 927°C to 980°C, Inconel 713C is the optimal choice. As a high-aluminum cast alloy, it offers industrial durability and creep resistance unmatched by forged alloys.
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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 application areas. 713C is optimized for high-temperature creep strength (up to 980°C), while 718 is designed to achieve higher strength and superior weldability at lower temperatures (up to 700°C). 713C is a high-chromium casting alloy with excellent corrosion resistance; while 718 is a precipitation-hardening alloy, making it easier to machine.
What are the alternatives to Inconel 713C?
Alternatives to Inconel 713C include Inconel 718, Rene 77, and Mar-M247. Inconel 718 has higher tensile strength, making it ideal for low-temperature applications, but less suitable for prolonged high-temperature use.
Inconel 713C and Inconel 718 alloy standards
Inconel 713C: UNS N07713, DIN 2.4671.
Inconel 718: UNS N07718, DIN 2.4668
1. Comparison Data Table of Inconel 718 and Inconel 713C Technologies
| Technical Feature | Inconel 713C (Casting) | Inconel 718 (Wrought) | Industrial Significance |
| Strengthening Phase | Gamma Prime (γ′) | Gamma Double Prime (γ′′) | 713C phase is more heat-stable. |
| Fabrication Method | Investment Casting Only | Wrought / Forged / Machined | 718 is easier for complex shapes. |
| Max Service Temp (Load) | 980°C (1800°F) | 700°C (1292°F) | 713C wins in the "Red Zone." |
| Oxidation Resistance | Superior at 1000°C | Moderate at 800°C | 713C avoids scaling at heat. |
| Aluminum Content | 6.0% (High) | 0.5% (Low) | Al content creates the heat shield. |
| Yield Strength at 800°C | **~ 150 - 200 MPa** | Failed (< 50 MPa) | 713C remains structural. |
2. Physical properties of Inconel 718 and Inconel 713C
| 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 |
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3. Key Differences Between Inconel 718 and Inconel 713C
The fundamental difference between these two alloy giants lies in their strengthening mechanisms.
Inconel 718 (650°C high-temperature alloy): Primarily relies on the niobium-based γ′′ phase. It possesses extremely high tensile strength at room temperature and maintains excellent performance at temperatures up to 650°C. It is an ideal material for engine shafts and turbine disks.
Inconel 713C (980°C high-temperature alloy): Primarily relies on a high volume fraction (approximately 60%) of aluminum-based γ′ phase. These phases exhibit thermal stability at extreme high temperatures, preventing atomic-level slippage that leads to creep fracture.
4. Inconel 718 and Inconel 713C Applications
If your application involves high vibration, high pressure, or rotational centrifugal forces, and temperatures below 700°C, choose Inconel 718 bars/sheets. It is the most cost-effective solution for turbine discs, high-strength fasteners, and engine shafts.
If your components are stationary or rotating parts exposed to sustained temperatures above 850°C, such as drone turbine impellers, turbocharger rotors, or nozzle blades, choose Inconel 713C master alloy/cast bars. In this case, thermal stability and creep resistance are your primary considerations.
Why choose a Tier 1 supplier like Gnee Alloy?
As a specialized Superalloy Manufacturer, we provide more than just raw material; we provide engineering certainty:
✅️VIM (Vacuum Induction Melting): We produce 713C and 718 via double-vacuum refining to ensure zero internal inclusions.
✅️MTC 3.1 Traceability: Full EN 10204 3.1 documentation provided for every project, ensuring your audit trail is 100% secure.
✅️Ready-to-Ship Inventory: We maintain a massive Wholesale Inventory of master melt rods and wrought bars for Fast Global Shipping.
✅️Expert Consultation: Not sure if 718 is enough? Our engineers will analyze your thermal profile to save you from expensive material failure.
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 inconel 713C Product Packing
Contact us for the latest export price quote for inconel 713C Alloy
FAQ
Q1: Can I machine Inconel 713C into parts like I do with 718?
A: Generally, NO. Inconel 713C is extremely brittle and hard. It is designed to be Investment Cast into its near-net shape. Secondary processing is usually limited to precision grinding of the mating surfaces.
Q2: Which alloy handles cyclic oxidation better?
A: Inconel 713C. Its 6% Aluminum content forms a "self-healing" alumina scale that is much more adherent at temperatures reaching 1000°C compared to the chromia scale formed on 718.
Q3: Can 713C be welded for repair?
A: Welding 713C is extremely difficult due to the risk of strain-age cracking. For assemblies requiring extensive welding, we often recommend using Inconel 625 or Inconel 718 for the non-critical heat zones.
Q4: Do you offer bulk discounts for aerospace maintenance programs?
A: Yes. As a Reliable Supplier, we support long-term supply contracts for both master alloys and wrought bars with tiered Wholesale Pricing.
