In high-risk fields such as aerospace, nuclear energy, and energy engineering, the material use window is a critical pain point. Purchasing managers often mistakenly believe that GH4169, with a melting point of 1260°C, is safe to use at 900°C.
The technical truth: The structural integrity of GH4169 (equivalent to Inconel 718) is closely related to its strengthening phase-γ′′ (γ′′). Once the temperature exceeds 750°C (1382°F), these precipitated phases begin to dissolve or transform. This is known as over-aging, which leads to a sharp drop in yield strength and component sagging.
At Gnee Alloy, we ensure your industrial durability by matching the material's metallurgical limits to your specific heat treatment profile.
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GH4169 Temperature Limits: Performance Guidelines from -253°C to 700°C
Gnee Alloy
GH4169 Temperature Limits: Performance Guidelines from -253°C to 700°C
GH4169 (similar to Inconel 718) is a precipitation-hardening nickel-based superalloy with high strength, excellent corrosion resistance, and good machinability. Its properties are optimized for applications ranging from extremely low temperatures to high temperatures (typically up to 650°C–700°C).
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What is GH4169 equivalent to?
Inconel 718
GH4169 (equivalent to the American brand Inconel 718) is a precipitation-hardening nickel-based superalloy widely used in the aerospace industry due to its excellent mechanical properties (Lu et al., 2014).
1. GH4169 Temperature Limit Performance Guide
Optimal Operating Range (-253°C to 650°C): The alloy maintains high tensile strength, fatigue strength, creep strength, and fracture strength.
Maximum Operating Temperature (650°C to 700°C): Below 700°C, the long-term strength of the alloy begins to decrease, and the microstructure changes.
Structural Stability: The main strengthening phase γ′′ remains stable below approximately 650°C.
Performance of GH4169 over the temperature range
Cryogenic to Room Temperature (-253°C to 20°C)
Performance: GH4169 exhibits excellent toughness and strength in cryogenic environments, including liquid hydrogen (-253°C) and liquid nitrogen (-196°C).
Application Guidelines: This alloy shows no tendency for brittle fracture at cryogenic temperatures, making it suitable for liquid-fueled rocket components.
Intermediate Temperature (20°C to 600°C)
Performance: This alloy maintains high strength and exhibits extremely high fatigue resistance and oxidation resistance.
Abrasion Resistance: Abrasion resistance increases slightly with temperature (e.g., at 525°C compared to room temperature).
High Temperature (600°C to 700°C)
Strength Limitation: Above 630°C, the material begins to soften.
Phase Transformation: Prolonged exposure to 650°C causes the γ" phase (strengthening phase) to transform into the stable β phase (δ phase), thus reducing the strengthening effect.
Creep Fracture: Excellent creep resistance is observed below 650°C/700 MPa, but this drops sharply at 700°C/660 MPa.
Extreme Temperatures (>700°C)
Oxidation: At 850°C, the surface oxide film becomes porous and easily peels off.
Usage Limitations: Long-term load-bearing applications above 700°C are not recommended as structural softening is accelerated.
6. GH4169 Temperature Range Matrix
| Service Zone | Temperature Range | Performance Mode | Typical Application |
| Cryogenic | -253°C to 0°C | Exceptional Toughness | Liquid H2/O2 Storage. |
| Standard Heat | Up to 650°C (1200°F) | Peak Yield Strength | Turbine discs, engine shafts. |
| Intermittent | 700°C (1292°F) | Critical Load Burst | Short-term rocket motor service. |
| Oxidation Limit | 980°C (1800°F) | Resists Scaling; Zero Load | Static thermal shields only. |
7. Typical yield strength of GH4169 alloy (fully aged state)
| Temperature (℃/°F) | Yield Strength σp0.2 (MPa) | Industrial Verdict |
| 20°C (Room Temp) | ≥ 1030 MPa | Elite static load support. |
| 540°C (1000°F) | ≥ 950 MPa | Highly stable structural integrity. |
| 650°C (1200°F) | ≥ 850 MPa | Safe Limit for Continuous Load. |
| 700°C (1292°F) | ~ 700 MPa | The "Danger Zone" (Over-aging begins). |
| 850°C (1562°F) | < 150 MPa | FAILURE (Do not use for load). |
8. Typical Applications of GH4169
Aerospace: Aircraft engine turbine disks, compressor shafts, and blades.
Power Generation: Critical components in ultra-supercritical (USC) systems.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅️VIM + VAR melting: Eliminates trace impurities that lower the over-aging threshold, maximizing your Material Life Cycle.
✅️MTC 3.1 Traceability: Full heat-analysis and high-temperature tensile test results included.
✅️Ready-to-Ship Inventory: Large stock of solution-treated rods and sheets ready for immediate project dispatch.
✅️Custom Fabrication: We offer precision cutting and centerless grinding to match your assembly blueprints.
Gnee Alloy GH4169(inconel 718) 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 Alloy GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Will GH4169 warp if it hits 800°C for only 10 minutes?
A: Short spikes are usually survivable without warping if the load is low. However, any exposure above 750°C triggers the irreversible Over-aging process. We recommend an NDT hardness check after such an event to verify remaining strength.
Q2: Is GH4169 better than 310S for 900°C furnace parts?
A: It depends. 310S is a basic heat-resistant steel better for non-load oxidation resistance up to 1000°C. GH4169 is a high-strength superalloy. If you need the part to hold its shape under pressure, GH4169 is superior up to 700°C, but neither is ideal for load-bearing at 900°C.
Q3: Does GH4169 maintain its properties at liquid nitrogen temperatures?
A: Absolutely. It is one of the premier Cryogenic Superalloys, maintaining excellent ductility and fracture toughness down to -196°C and even -253°C.
Q4: Do you offer bulk discounts for aerospace maintenance (MRO) projects?
A: Yes. As a leading Wholesale Supplier, we offer tiered pricing and priority inventory reserves for long-term contract partners.
