Choosing the right nickel alloy for a critical environment often involves a choice between two extremes: resistance to severe chemical corrosion or the ability to withstand structural stresses at near-melting temperatures?
In the aerospace, marine, and chemical industries, Inconel 625 and Inconel 713C are two of the most commonly used alloys, but their applications are vastly different. Gnee Alloy, a company with over 18 years of experience exporting nickel-based alloys, has compiled this comparative report to help you choose the right material and contribute to the success of your projects.
Contact our professionals to recommend the right alloy for your project
What is the difference between Inconel 625 and Inconel 713C
What is the difference between Inconel 625 and Inconel 713C
Inconel 625 is a solid solution-strengthened, highly corrosion-resistant alloy used in marine/chemical applications; while Inconel 713C is a precipitation-hardening, castable-only high-temperature alloy designed to provide superior creep strength for high-temperature, non-rotating turbine components. 625 is produced using forging or casting processes, while 713C is primarily produced using precision casting processes, providing excellent structural stability at temperatures up to 980°C.
What is Inconel 713C?
INCONEL 713C is a nickel-chromium cast alloy which possesses outstanding rupture strength at 1700 F. combined with excellent resistance to thermal fatigue and good castability. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep and fatigue.
Comparison of Inconel 625 and Inconel 713C alloy properties
Inconel 625: The Champion of Corrosion Resistance
Inconel 625 (UNS N06625) is a wrought alloy primarily used for its incredible resistance to aqueous corrosion and high-strength fabricability.
Best For: Chemical processing, marine engineering, and nuclear reactors.
Key Advantage: It is virtually immune to chloride-ion stress corrosion cracking and resistant to a wide range of organic and inorganic acids.
Fabrication: Unlike 713C, 625 is highly weldable and can be formed into pipes, plates, and bars.
Inconel 713C: The Hero of High-Temperature Creep
Inconel 713C (UNS N07713) is a precipitation-hardened casting alloy designed for one specific environment: extreme heat combined with high mechanical stress.
Best For: Turbine wheels, jet engine blades, and turbocharger rotors.
Key Advantage: While 625 starts to lose structural integrity above 1200°F, Inconel 713C maintains exceptional creep-rupture strength up to 1800°F (982°C).
Form: It is almost exclusively used as a VIM melted master alloy for vacuum investment casting.
3. Overview of Inconel 713C and 718 Alloy Materials
| Feature | Inconel 625 | Inconel 713C |
| Primary Strength | Corrosion Resistance | High-Temp Creep Strength |
| Material Form | Wrought (Pipe, Plate, Bar) | Cast (Master Alloy Sticks) |
| Max Service Temp | Up to 1200°F (Structural) | Up to 1800°F (Structural) |
| Weldability | Excellent | Poor (Cast-only application) |
| Common Application | Acid tanks, sea water pipes | Turbine rotors, turbocharger wheels |
| Key Standards | ASTM B444, AMS 5581 | AMS 5391, GE C50TF15 |
4. Comparison of chemical composition (weight percentage) of Inconel 713C and 718 alloys
| Element | Inconel 713C (Cast) | Inconel 625 (Wrought) | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance (~70‑75) | 58.0 min (Balance) | 713C has higher Ni |
| Chromium (Cr) | 11.0 – 14.0 | 20.0 – 23.0 | 625 has much higher Cr |
| Molybdenum (Mo) | 3.5 – 5.0 | 8.0 – 10.0 | 625 higher |
| Niobium (Nb) | 1.5 – 2.5 | 3.15 – 4.15 | 625 higher |
| Titanium (Ti) | 0.4 – 1.0 | ≤ 0.40 | 713C higher |
| Aluminum (Al) | 5.5 – 6.5 | ≤ 0.40 | 713C much higher Al |
| Iron (Fe) | ≤ 2.0 | ≤ 5.0 | Both low |
| Cobalt (Co) | ≤ 1.0 | ≤ 1.0 | Similar |
| Carbon (C) | 0.05 – 0.15 | ≤ 0.10 | Similar |
| Manganese (Mn) | ≤ 0.20 | ≤ 0.50 | – |
| Silicon (Si) | ≤ 0.50 | ≤ 0.50 | – |
| Boron (B) | 0.005 – 0.015 | – | 713C contains B |
| Zirconium (Zr) | 0.05 – 0.15 | – | 713C unique |
| Copper (Cu) | – | ≤ 0.07 | – |
Click to download the Inconel 713C alloy PDF file now
5. Physical properties of Inconel 713C and 718 alloys
| Property | Inconel 713C (Cast) | Inconel 625 (Wrought) |
|---|---|---|
| Density | 7.91 g/cm³ | 8.44 g/cm³ |
| Melting Range | 1260 – 1315°C | 1290 – 1350°C |
| Thermal Conductivity (20°C) | 11.2 W/m·K | 9.8 W/m·K |
| Coefficient of Thermal Expansion (20‑100°C) | 12.0 × 10⁻⁶/°C | 12.8 × 10⁻⁶/°C |
| Coefficient of Thermal Expansion (20‑800°C) | ~14.0 × 10⁻⁶/°C | ~15.0 × 10⁻⁶/°C |
| Specific Heat (20°C) | 450 J/kg·K | 410 J/kg·K |
| Modulus of Elasticity (20°C) | ~205 GPa | ~207 GPa |
| Electrical Resistivity | 1.30 µΩ·m | 1.29 µΩ·m |
| Magnetic Properties | Non‑magnetic | Non‑magnetic |
6. Comparison of corrosion resistance of Inconel 713C and 718 alloys
| Environment | Inconel 713C | Inconel 625 |
|---|---|---|
| Oxidizing Acids | Moderate | Excellent (higher Cr) |
| Reducing Acids | Poor | Excellent (high Mo + Nb) |
| Chloride Pitting | Limited | Excellent |
| Seawater | Not recommended | Excellent |
| High‑Temp Oxidation | Good to 950°C | Good to 980°C |
| Sour Gas (H₂S) | Not recommended | Excellent |
7. Inconel 625 and Inconel 713C Selection Strategy
If you are designing systems for a chemical plant or offshore platform where acid or brine is the primary threat, then Inconel 625 is your standard choice. It offers the ductility and weldability required for complex piping and vessel systems.
However, if you are an engineer at a turbocharger manufacturer or an aerospace foundry, Inconel 713C is the only option. At temperatures of 1800°F (approximately 982°C), 625 will deform like "warm butter," while the γ'-reinforced matrix of 713C maintains rigidity even under immense centrifugal forces.
8. Why Source Your Alloys from Us?
As a global leader in nickel alloys, we don't just ship metal-we provide metallurgical solutions.
Certified Quality: Our 713C master alloys are VIM melted for extreme purity.
Engineering Support: Not sure about the fit? Our team can review your specs to ensure compliance with AMS 5391 or ASTM B444.
Wholesale Pricing: We offer factory-direct rates for bulk orders and annual supply contracts.
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 713C Alloy
FAQ
Q: Can I use Inconel 625 for a turbine blade?
A: Only for the low-temperature sections. For the high-pressure turbine blades exposed to 1500°F+, Inconel 625 lacks the creep strength. You must use Inconel 713C or 738.
Q: Is there a cost difference between 625 and 713C?
A: Yes. Inconel 625 is generally more expensive due to its higher Molybdenum and Niobium content. However, the total cost of 713C often includes the precision casting process. Contact us for a live price per KG.
Q: Can 713C be welded to 625?
A: It is extremely difficult. 713C is prone to hot cracking. Such joints usually require highly specialized inertia welding or specialized brazing.
