In the high-risk field of aerospace engineering, standard Inconel 713C alloys sometimes fall short in terms of toughness, a critical aspect. For large turbine impellers, integral rotors, and components subjected to extreme thermal cycling, Inconel 713LC (a low-carbon alloy) is the ideal solution. By precisely controlling the carbon content, the 713LC alloy achieves a perfect balance between creep strength at 1800°F (982°C) and the crack resistance required for critical components.
As a Tier 1 supplier of high-temperature alloys, Gnee Alloy offers VIM-melted 713LC master alloy bars conforming to the stringent AMS 5377 standard, ensuring optimal mechanical integrity for your aerospace castings.
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Inconel 713LC: A Guide to High-Performance Aerospace Castings
Inconel 713LC: A Guide to High-Performance Aerospace Castings
Inconel 713LC (low carbon) is a vacuum-cast nickel-based superalloy designed for high-temperature applications requiring exceptional strength, resistance to thermal fatigue, and creep resistance. It is widely used in high-integrity components for aerospace turbine engines and power generation gas turbines.
As an improved version of Inconel 713C, the 713LC variant has higher ductility and lower sensitivity to casting hot tearing, making it ideal for thin-walled castings.
What are the differences between INCONEL 713C and 713LC?
Introduction to Inconel 713LC
It is an improved version of Inconel 713C with a lower carbon content and better casting properties, making it particularly suitable for manufacturing high-integrity aerospace turbine blades, guide vanes, and structural hot-end components.
1. Technical Specifications: AMS 5377 vs. AMS 5391
| Element | Inconel 713C (AMS 5391) | Inconel 713LC (AMS 5377) | Technical Impact |
| Carbon (C) | 0.08 - 0.20% | 0.05% Max | Eliminates grain boundary brittleness. |
| Nickel (Ni) | Balance | Balance | Heat-resistant matrix. |
| Chromium (Cr) | 12.0 - 14.0% | 11.0 - 13.0% | Excellent oxidation resistance. |
| Aluminum (Al) | 5.5 - 6.5% | 5.5 - 6.5% | Primary γ′ strengthening phase. |
| Zirconium (Zr) | 0.05 - 0.15% | 0.05 - 0.15% | Critical for high-temp stability. |
2. Mechanical properties of 713C and 713LC alloys
| Property | Inconel 713C (Typical) | Inconel 713LC (Typical) |
| Tensile Elongation (RT) | 5% | 8% - 15% |
| Charpy Impact Strength | Moderate | High (Superior Crack Resistance) |
| Creep Rupture (1800°F) | 30+ Hours | 30+ Hours (Maintained) |
| Thermal Fatigue Life | Standard | Enhanced |
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3. Inconel 713LC Aerospace Casting Applications
Inconel 713LC is primarily used for components in vacuum investment casting because it reacts with atmospheric oxygen at high temperatures.
Turbine blades and guide vanes: Its excellent fatigue life makes it suitable for high-pressure and low-pressure turbine components.
Combustion chambers: High heat resistance prevents deformation of the hottest engine components.
Exhaust systems: This alloy resists corrosion from high-speed, high-temperature gases.
Structural high-temperature components: Ideal for manufacturing complex, thin-walled parts.
4. inconel 713LC Alloy Manufacturing and Machining Guidelines
Casting: Equiaxed crystal structure is preferred, but directional solidification (DS) parts are also suitable to improve creep performance.
Machinability: Although 713LC stainless steel is designed for near-net-shape casting, its high strength and abrasiveness make it difficult to machine. CNC machining requires advanced tools (carbide, PCD) and optimized machining parameters. A stable machining window is typically Ug = 30-50 m/min.
Welding: Due to its high-temperature strength, it is generally classified as a difficult-to-weld material, but it can be repaired using specialized welding processes.
Post-treatment: Hot isostatic pressing (HIP) is typically used to remove internal porosity in castings, thereby significantly improving high-cycle fatigue life.
Why choose to source aerospace-grade 713LC steel from Gnee Alloy?
✅️VIM Melting Excellence: We produce 713LC in a deep vacuum environment, ensuring ultra-low gas content (O, N < 10ppm), which is essential for maintaining the high ductility of the LC grade.
✅️Investment Casting Integrity: Our high-purity master alloy sticks provide exceptional fluidity, allowing for the casting of thin-walled, complex aerospace blades with zero inclusions.
✅️Factory-Direct Wholesale Pricing: Bypass middleman markups. We provide competitive bulk rates for large-scale aerospace casting projects and annual supply contracts.
Gnee Steel 713LC 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 713lC Product Packing
Contact us for the latest export price quote for 713LC Alloy
FAQ
Q: Is Inconel 713LC a direct replacement for 713C?
A: In most cases, yes, especially if your component is prone to cracking or thermal fatigue. While the high-temperature creep strength is nearly identical, the 713LC grade offers a much broader safety margin during cooling and service.
Q: Why is 713LC considered "Aerospace Grade"?
A: The "LC" version is more difficult to refine to such low carbon levels while maintaining alloy balance. This precision melting makes it more expensive but necessary for the high-stress, safety-critical environments of jet engines.
Q: Do you offer MTC 3.2 third-party inspection?
A: Yes. For high-end aerospace castings, we can arrange for third-party inspections (SGS, Lloyd's, or BV) to verify compliance with AMS 5377 or specific OEM specifications.
