In the aerospace and gas turbine industries, engine reliability often hinges on minute differences in carbon content. While INCO 713 is the common name for this precipitation-hardening superalloy, engineers must distinguish between the standard 713C and the low-carbon (713LC) versions.
Gnee Alloy, a professional superalloys consulting firm with 18 years of experience, helps partners worldwide navigate these technical nuances to ensure component integrity and casting yields at their highest levels.
Contact our professionals to recommend the right alloy for your project
Inconel 713 vs 713C vs 713LC: How to choose the appropriate grade
Inconel 713 vs 713C vs 713LC: How to choose the appropriate grade
Inconel 713 (and its main variants 713C and 713LC) is a nickel-based cast superalloy designed for high-temperature strength, excellent oxidation resistance, and superior creep fracture resistance, making it particularly suitable for gas turbine environments with temperatures up to 980°C (1800°F).
The choice of alloy depends on whether your application prioritizes maximum fracture strength (713C) or better fatigue resistance and weldability (713LC).
What is Inconel 713C?
Inconel 713C is a nickel-chromium casting alloy that exhibits excellent fracture strength at 1700°F (927°C), while also possessing 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.
Inconel 713, 713C and 713LC Feature Applications
Inconel 713 (General Purpose Alloy)
Inconel 713 matrix alloy (usually referring to this series of alloys, often synonymous with 713C) is the standard choice for high-strength cast components that need to withstand temperatures up to 980°C. It is known for its excellent oxidation resistance, making it suitable for gas turbines.
Inconel 713C (Cast)
Inconel 713C is the standard "C" type cast version, a precipitation-hardening nickel-chromium alloy.
Advantages: Excellent creep rupture strength, superior resistance to thermal fatigue, and high structural stability at high temperatures (927°C-980°C).
Optimal Applications: Jet engine turbine blades and high-temperature gas path components, which require the highest creep resistance and do not require extensive welding.
Disadvantages: Due to its high carbon content, it is prone to carbide precipitation, making it difficult to machine and resulting in poor weldability.
Inconel 713LC (Low Carbon)
Inconel 713LC is an improved version of 713C, featuring a lower carbon content and adjusted chromium/molybdenum content.
Advantages: Significantly improved room temperature plasticity, impact strength, and fatigue resistance compared to 713C.
Optimal Applications: Integral cast turbine impellers and complex thin-walled castings requiring higher resistance to thermal fatigue.
Benefits: Due to its lower carbon content, it generally offers better weldability and greater integrity in large, complex castings.
4. Comparison of Inconel 713C and Inconel 713LC technologies
| Feature | Inconel 713C (Standard) | Inconel 713LC (Low Carbon) | Expert Insight |
| Carbon (C) Content | 0.08 - 0.20% | 0.05% Max | LC improves toughness and ductility. |
| Zirconium (Zr) | 0.05 - 0.15% | 0.05 - 0.15% | Essential for grain boundary stability. |
| Elongation (%) | 5.0% Typical | 8.0 - 15.0% | 713LC offers nearly double the ductility. |
| Primary Advantage | Peak Creep Strength | Thermal Fatigue Resistance | Choose LC for larger rotors. |
| Standard Spec | AMS 5391 | AMS 5377 / GE B50TF28 | High-end aerospace compliance. |
5. Comparison of chemical composition of Inconel 713C and Inconel 713LC (wt%)
| Element | Inconel 713C | Inconel 713LC | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance (~70-75) | Balance (~70-75) | Same |
| Chromium (Cr) | 11.0 – 14.0 | 11.0 – 14.0 | Same |
| Aluminum (Al) | 5.5 – 6.5 | 5.5 – 6.5 | Same |
| Molybdenum (Mo) | 3.5 – 5.0 | 3.5 – 5.0 | Same |
| Niobium (Nb) | 1.5 – 2.5 | 1.5 – 2.5 | Same |
| Titanium (Ti) | 0.4 – 1.0 | 0.4 – 1.0 | Same |
| Iron (Fe) | ≤ 2.0 | ≤ 2.0 | Same |
| Cobalt (Co) | ≤ 1.0 | ≤ 1.0 | Same |
| Carbon (C) | 0.05 – 0.15 | 0.05 – 0.10 | 713LC lower carbon |
| Boron (B) | 0.005 – 0.015 | 0.005 – 0.015 | Same |
| Zirconium (Zr) | 0.05 – 0.15 | 0.05 – 0.15 | Same |
| Manganese (Mn) | ≤ 0.20 | ≤ 0.20 | Same |
| Silicon (Si) | ≤ 0.50 | ≤ 0.50 | Same |
Click to download the Inconel 713C alloy PDF file now
6. Physical properties of Inconel 713C and Inconel 713LC
| Property | Inconel 713C | Inconel 713LC |
|---|---|---|
| Density | 7.91 g/cm³ | 7.90 g/cm³ |
| Melting Range | 1260 – 1315°C | 1265 – 1315°C |
| Thermal Conductivity (20°C) | 11.2 W/m·K | 11.2 W/m·K |
| CTE (20-100°C) | 12.0 × 10⁻⁶/°C | 12.0 × 10⁻⁶/°C |
| CTE (20-800°C) | ~14.0 × 10⁻⁶/°C | ~14.0 × 10⁻⁶/°C |
| Specific Heat (20°C) | 450 J/kg·K | 450 J/kg·K |
| Modulus of Elasticity (20°C) | ~205 GPa | ~205 GPa |
| Magnetic Properties | Non-magnetic | Non-magnetic |
7. High-temperature mechanical properties of Inconel 713C and Inconel 713LC
| Temperature | Property | Inconel 713C | Inconel 713LC |
|---|---|---|---|
| 500°C | Tensile Strength | ~830 MPa | ~830 MPa |
| Yield Strength | ~680 MPa | ~680 MPa | |
| 600°C | Tensile Strength | ~810 MPa | ~810 MPa |
| Yield Strength | ~660 MPa | ~660 MPa | |
| 700°C | Tensile Strength | ~770 MPa | ~770 MPa |
| Yield Strength | ~600 MPa | ~600 MPa | |
| 760°C | Tensile Strength | ~710 MPa | ~710 MPa |
| Yield Strength | ~540 MPa | ~540 MPa | |
| 800°C | Tensile Strength | ~680 MPa | ~680 MPa |
| Yield Strength | ~500 MPa | ~500 MPa | |
| 850°C | Tensile Strength | ~600 MPa | ~590 MPa |
| Yield Strength | ~450 MPa | ~440 MPa | |
| 900°C | Tensile Strength | ~500 MPa | ~490 MPa |
| Yield Strength | ~400 MPa | ~390 MPa | |
| 950°C | Tensile Strength | ~400 MPa | ~390 MPa |
| Yield Strength | ~350 MPa | ~340 MPa |
8. Stress fracture and creep characteristics of Inconel 713C and Inconel 713LC
| Temperature | Stress | 713C Rupture Life | 713LC Rupture Life | Comparison |
|---|---|---|---|---|
| 700°C / 100h | 350 MPa | ~100 hours | ~100 hours | Similar |
| 700°C / 1000h | 280 MPa | ~1,000 hours | ~950 hours | 713C slightly higher |
| 800°C / 100h | 250 MPa | ~100 hours | ~100 hours | Similar |
| 800°C / 1000h | 200 MPa | ~1,000 hours | ~900-950 hours | 713C slightly higher |
| 850°C / 100h | 180 MPa | ~100 hours | ~95 hours | 713C slightly higher |
| 900°C / 100h | 150 MPa | ~100 hours | ~95 hours | 713C slightly higher |
| 950°C / 100h | 100 MPa | ~100 hours | ~90-95 hours | 713C slightly higher |
Comparison of creep strength between Inconel 713C and Inconel 713LC
| Temperature | 713C Creep Strength (0.1%/100h) | 713LC Creep Strength (0.1%/100h) |
|---|---|---|
| 800°C | ~200 MPa | ~190-195 MPa |
Click to view our professional certificates for Inconel 713C alloy
9. Quick Selection Guide for Inconel 713, Inconel 713C, and Inconel 713LC
| Grade | Best For | Key Characteristic | Typical Applications |
|---|---|---|---|
| Inconel 713C | Maximum high‑temp strength | Higher Carbon (0.08–0.2%), excellent creep resistance | Aero‑engine turbine blades, turbocharger rotors |
| Inconel 713LC | Fatigue & ductility (low carbon) | Reduced carbon, improved ductility & fatigue life | Integral casting turbine wheels, components requiring welding |
| Inconel 713 | General high‑temp cast | Basic high‑temperature performance up to 980°C | Gas turbines, turbochargers |
10. How to choose between Inconel 713C and Inconel 713LC?
If you are manufacturing small turbocharger impellers or standard aerospace blades and your primary concern is maximum creep resistance at 1800°F (982°C), you should purchase 713C.
If you are casting large turbine impellers, integral rotors, or parts subjected to rapid thermal cycling, and crack resistance (ductility) is critical, you should purchase 713LC.
Click to get Inconel 713C samples for purchase
11. Why choose Gnee Alloy's Inconel 713C and Inconel 713LC alloys?
Regardless of the grade you choose, the integrity of your turbine depends on the quality of the Master Alloy Sticks.
✅️VIM Melting (Vacuum Induction Melting): We produce both 713C and 713LC via VIM to ensure ultra-low gas content (O, N < 10ppm).
✅️MTC 3.1 Certification: Every batch undergoes rigorous lab testing to verify the precise Carbon and trace element levels.
✅️Global Supply Capability: As a trusted nickel alloy exporter, we provide factory-direct wholesale pricing and managed logistics for global foundries.
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 Product Packing
Contact us for the latest export price quote for 713C Alloy
FAQ
Q: Is there a price difference between 713C and 713LC?
A: Yes. Inconel 713LC is generally considered a higher-end specialty grade. The tighter control over carbon content and specific heat treatment requirements often result in a slightly higher wholesale price per KG.
Q: Can I weld 713LC since it has lower carbon?
A: While 713LC has slightly better ductility, it is still considered a "difficult-to-weld" alloy due to its high Al+Ti content. For joining, we recommend specialized brazing or friction welding.
Q: Do you stock both grades?
A: We maintain a strategic inventory of standard 713C master alloy sticks. 713LC is typically produced to order or stocked for our long-term annual supply contract partners.
