In the complex field of superalloys, choosing the wrong material can lead to catastrophic failures or unnecessary budget overruns. One of the most frequently asked questions our technical sales team receives is, "Should I choose Inconel 625 or Inconel 713C?"
While both are nickel-based alloys, their applications are quite different. One excels in water corrosion resistance, while the other reigns supreme in high-temperature creep resistance, boasting a creep strength of up to 1800°F (approximately 982°C). This article will provide you with the technical information needed to optimize your material selection strategy.
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What is the difference between Inconel 625 and Inconel 713
What is the difference between Inconel 625 and Inconel 713
Inconel 713LC (Low Carbon) is an improved version of Inconel 713C, with its main advantages being improved ductility, weldability, and resistance to thermal fatigue, while 713C exhibits higher fracture strength at extreme temperatures (above 900°C). 713LC is more suitable for complex, large-section castings, while 713C is optimized for high-temperature jet engine gas turbine blades.
What is the yield strength of Inconel 713?
INCO 713 Titanium Alloy
INCO 713 typically boasts an ultimate tensile strength (UTS) of up to 1,100 MPa and a yield strength of approximately 800 MPa, reflecting advancements in materials engineering.
Key attributes of Inconel 713C and Inconel 625
Inconel 625 (UNS N06625) Corrosion Resistance Alloy
Inconel 625 is a solid solution strengthened forging alloy. Its strength derives from molybdenum and niobium in a nickel-chromium matrix.
Core Standards: AMS 5666 (bars), AMS 5599 (plates), ASTM B444 (pipes).
Key Advantages: Excellent corrosion resistance in seawater, acids, and salts. It has good weldability and is easily machined into pipes, bellows, and heat exchangers.
Temperature Limitations: While it has good heat resistance, structural integrity is compromised above 1200°F (650°C) compared to cast alloys.
Inconel 713C (UNS N07713): High-Temperature Casting Alloy
Inconel 713C is a precipitation hardening cast alloy. Due to its extremely high hardness, it cannot be rolled or forged, and therefore cannot be made into forgings such as pipes or plates.
Core Standard: AMS 5391 (Precision Casting).
Key Advantages: Excellent creep strength at temperatures up to 1800°F (982°C). This is due to its high volume fraction of γ′-reinforced precipitates.
Primary Applications: Gas turbine blades, nozzle guide vanes, and turbocharger rotors-components that must rotate at high speeds under extreme temperatures.
5. Comparison of Inconel 625 and Inconel 713C technologies
| Feature | Inconel 625 (Wrought) | Inconel 713C (Cast) | Engineering Insight |
| Material Form | Pipe, Plate, Bar, Wire | Master Alloy Sticks / Casting | 713C is cast-to-size only. |
| Industry Standard | AMS 5666 | AMS 5391 | Know your compliance. |
| Strengthening | Solid Solution | Gamma-Prime (
γ′γ′ ) |
713C is structurally superior at 1000°C. |
| Weldability | Excellent | Very Poor | Don't try to weld 713C turbine blades. |
| Best For | Marine, Chemical, Nuclear | Aerospace & Turbocharger Rotors | Match the alloy to the load. |
6. Typical chemical composition of Inconel 625 and Inconel 713C (wt%)
| Element | Inconel 625 (typical) | Inconel 713C (typical) |
|---|---|---|
| Nickel (Ni) | Balance (about 58–63%) | Balance (often >60%) |
| Chromium (Cr) | 20–23% | 12–14% |
| Molybdenum (Mo) | 8–10% | 3.8–5.2% |
| Niobium (Nb, sometimes reported as Cb) | 3.0–4.2% | 1.8–2.8% (Nb+Ta) |
| Aluminum (Al) | 0.2–0.4% | 5.5–6.5% |
| Titanium (Ti) | ~0.3% | 0.5–1.0% |
| Carbon (C) | ≤0.10% | 0.08–0.20% |
| Iron (Fe) | ≤5% typical | ≤2.5% typical |
| Others (Si, Mn, B, Zr) | trace | trace, with intentional B, Zr in some grades |
7. Typical mechanical properties (range) of Inconel 625 and Inconel 713C
| Property | Inconel 625 (wrought typical) | Inconel 713C (cast typical, heat treated) |
|---|---|---|
| Density | ~8.44 g/cm³ | ~8.2–8.4 g/cm³ |
| Room temp tensile strength (ultimate) | ~800–1,200 MPa (varies by product form) | ~700–1,100 MPa (depends on heat treatment) |
| Room temp yield strength (0.2% proof) | ~275–690 MPa (widely variable) | ~300–700 MPa |
| Elongation (room temp) | 30% typical in wrought forms | 5–20% typical in cast, depends on heat treat |
| Creep strength (elevated temp) | Good up to moderate temperatures | Superior creep resistance at 700–1000°C when aged |
| Service temperature (long term) | Up to ~982°C in many services | Designed for high temperature structural service in similar range |
Click to download the Inconel 713C alloy PDF file now
8. Comparison of corrosion performance of Inconel 625 and Inconel 713C
| Environment | Inconel 625 | Inconel 713C |
|---|---|---|
| Seawater, chloride service | Excellent | Fair to moderate |
| Acidic chloride solutions | Excellent | Limited |
| High temperature oxidation in air | Very good | Very good |
| Sulfidation / combustion gases | Good | Good to very good depending on variant |
7. Choosing Between Inconel 625 and Inconel 713C
One of the biggest misconceptions in sourcing is overusing Inconel 625 when the cast integrity of Inconel 713C is actually needed.
If your parts are static and will be exposed to acidic substances: Inconel 625 is the ideal choice.
If your parts will rotate and be exposed to temperatures of 1800°F (approximately 982°C): Inconel 713C is the undisputed choice.
Gnee Alloy, as a one-stop sourcing center for high-temperature alloys, offers comparative Requests of Quotations (RFQs) to help you evaluate cost-effectiveness. By sourcing master alloys or forged products directly from the factory, you can ensure the highest MTC 3.1 traceability while optimizing your project budget.
Gnee Alloy 713C certificate
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FAQ
Q: Can I get Inconel 713C in a "seamless pipe" form?
A: No. Because of its 6% Aluminum content, it is too brittle for cold drawing. If you need a hollow shape for 1800°F, it must be vacuum investment cast or machined from a cast bar. We provide VIM-melted master alloy sticks specifically for this purpose.
Q: Is Inconel 625 cheaper than 713C?
A: Not necessarily. Price fluctuates with the Nickel and Niobium markets. However, the total cost of 713C is often higher due to the specialized Vacuum Investment Casting process required to form it.
Q: Why does 713C have better heat resistance?
A: It's all about the chemistry. The high Al+Ti content in AMS 5391 713C creates a "memory" in the metal's structure that resists deformation (creep) at temperatures where 625 would soften like warm butter.