In the highly competitive aerospace and automotive engineering fields, Inconel 713C (UNS N07713) is considered the "gold standard" for casting alloys. This nickel-chromium-aluminum alloy is renowned for its exceptional strength at most metal softening temperatures, making it the preferred material for components subjected to extreme thermal stresses.
As a Tier 1 manufacturer of high-temperature alloys, Gnee Alloy understands that the quality of the final casting depends entirely on the purity of the raw materials. In this guide, we will explore how Inconel 713C, conforming to AMS 5391 standards, can provide crucial assurance for your high-temperature projects.
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What is the Inconel 713C? AMS 5391 Features and Expert Guide
What is the Inconel 713C? AMS 5391 Features and Expert Guide
Inconel 713C (UNS NO7713) is a precipitation-hardening nickel-chromium-based cast superalloy, the main definition of which can be found in AMS 5391 Precision Casting Specification. This alloy exhibits excellent creep rupture strength and structural stability at temperatures up to 1800°F (982°C). It is an ideal material for high-temperature, high-stress applications, such as gas turbine blades.
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.
1. Inconel 713C (AMS 5391) Chemical Composition
The remarkable properties of Inconel 713C are derived from its precise balance of Aluminum (Al) and Titanium (Ti). These elements react with Nickel to form the strengthening intermetallic compounds.
| Element | Content (%) | Expert Note |
| Nickel (Ni) | Balance | Provides the heat-resistant matrix. |
| Chromium (Cr) | 12.0 - 14.0 | Ensures superior oxidation resistance. |
| Aluminum (Al) | 5.5 - 6.5 | High Al content is the key to 713C's creep strength. |
| Titanium (Ti) | 0.5 - 1.0 | Works with Al to facilitate precipitation hardening. |
| Molybdenum (Mo) | 4.0 - 5.0 | Provides solid solution strengthening. |
| Niobium (Nb) | 1.8 - 2.8 | Enhances high-temperature stability. |
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2. Gnee Alloy Inconel 713C Manufacturing Guide
Casting and Heat Treatment
Process: Vacuum investment casting is the preferred method.
As-cast: The material is typically used in the as-cast state.
Optional Treatment: Stress fracture life can be improved by solution treatment (air cooling) at 2150°F (1175°C) for 2 hours, followed by stabilization treatment.
Hot Isostatic Pressing (HIP): Hot isostatic pressing (HIP) is commonly used to eliminate internal porosity.
Machinability
Difficulty: Inconel 713C has a high rate of work hardening, making it very difficult to machine.
Techniques: Use sharp, hard-cutting tools (carbide), rigid equipment, and low feed rates.
Tip: Final machining should ideally be done after precipitation treatment.
Weldability
Challenges: It is generally considered non-weldable by conventional methods due to cracking susceptibility during solidification.
Repair: If necessary, specialized electron beam welding may be used. Mechanical fastening is often preferred over welding.
3. Characteristics of Inconel 713C (AMS 5391)
Excellent High-Temperature Strength: Exhibits outstanding fracture strength and creep resistance, especially at temperatures of 1700°F (927°C) and above.
Superior Oxidation Resistance: Due to its high chromium content (12-14%) and aluminum content, it forms a strong and stable oxide layer.
Good Casting Performance: Designed for investment casting, suitable for complex blades and internal cooling channels.
Resistant to Thermal Fatigue: High resistance to thermal fatigue ensures its stability under rapid temperature fluctuations.
Microstructure: Possesses an austenitic FCC microstructure and is typically used in the as-cast state (vacuum casting according to AMS 5391 standard).
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4. Inconel 713C (AMS 5391) Main Applications
Inconel 713C is ubiquitous in industries where heat and stress intersect:
Automotive Turbochargers: The turbine wheel (the "hot side") is almost exclusively made of 713C due to its fatigue resistance at high RPMs.
Aerospace Turbines: Used for low-pressure turbine blades, vanes, and integral rotors.
Industrial Gas Turbines: Excellent for nozzle guide vanes and heat-shielding components.
High-Temp Tooling: Ideal for heat-treatment fixtures and furnace hardware.
5. Why choose Gnee Alloy's inconel 713C VIM fused master alloy?
The performance of 713C is highly sensitive to trace impurities. This is where our VIM Melted Master Alloy Sticks provide a competitive edge.
✅️Vacuum Induction Melting (VIM): Our proprietary VIM process removes dissolved gases (O, N, H) and volatile impurities. We guarantee ultra-low oxygen content (<10 ppm), significantly reducing the "dross" or inclusions in your final cast parts.
✅️AMS 5391 Compliance: We provide full MTC 3.1 certification with every batch, ensuring your components meet the rigorous standards of global aerospace OEMs like GE, Honeywell, and Rolls-Royce.
✅️Rapid Factory Lead Time: We maintain a strategic buffer stock of standard 713C Master Alloy Sticks (Φ75mm/Φ80mm) to support your urgent production cycles and reduce your inventory costs.
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 Alloy Product Packing
Contact us for the latest export price quote for inconel 713C Alloy
FAQ
Q: Is Inconel 713C weldable?
A: Generally, no. Due to its high Al+Ti content, 713C is highly susceptible to strain-age cracking. For assembly, we recommend mechanical fasteners or specialized brazing techniques.
Q: What is the typical Factory Lead Time for bulk orders?
A: For standard master alloy sticks, we offer a lead time of 2-4 weeks, depending on current melt schedules. Custom sizes may require 6-8 weeks.
Q: Do you support small-scale R&D trials?
A: Yes! We offer sample master alloy sticks for foundries looking to qualify our material for new projects.
