For design engineers and purchasing personnel, the biggest challenge lies in balancing over-design with the risk of failure. Choosing overly expensive materials (such as single-crystal alloys) wastes budget, while choosing lower-grade alloys can lead to catastrophic failure at temperatures as high as 650°C (1200°F).
GH4169 high-temperature alloy (equivalent to Inconel 718) is the ideal solution. It offers the most cost-effective solution due to its perfect balance of performance: extremely high strength, excellent fatigue life, and resistance to high-temperature corrosion.
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GH4169 High-Temperature Alloy: Properties and Applications
GH4169 High-Temperature Alloy: Properties and Applications
GH4169 (UNS N07718) is a widely used precipitation-hardening nickel-based superalloy (equivalent to Inconel 718) designed for high-temperature environments ranging from -253°C to 650°C. It exhibits excellent tensile strength, creep resistance, and fatigue resistance below 650°C, along with outstanding oxidation resistance and weldability, making it a critical material for aerospace engines, nuclear energy, and the oil/gas industry.
How does Inconel 718 perform at high temperatures?
Inconel 718 is a precipitation-hardening nickel-based alloy designed to exhibit extremely high yield strength, tensile strength, and creep rupture strength at temperatures up to 1300°F (700°C). Inconel 718 has a slow age-hardening response, therefore, spontaneous hardening does not occur during heating and cooling, annealing, or welding.
1. GH4169 - UNS N07718 High Temperature Alloy Chemical Composition
| Grade | Standard | C | Si | Mn | P | S | Cr | Ni | Ti |
| GH4169/718 | ASTM B 670 | ≤0.08 | ≤0.35 | ≤0.35 | ≤0.015 | ≤0.015 | 17.00-21.00 | 50.0-55.0 | 0.65-1.1 |
2. GH4169's superior mechanical properties
The secret to GH4169's superior performance lies in its precipitation hardening mechanism. Unlike standard heat-resistant steels, our GH4169 maintains its structural integrity over an incredible temperature range (-253°C to 700°C).
Mechanical Performance Table (Standard Aged Condition):
| Property | Room Temp (20°C) | High Temp (650°C) | Benefit to Your Project |
| Yield Strength (σp0.2) | ≥ 1030 MPa | ≥ 850 MPa | Prevents deformation under high load. |
| Tensile Strength (σb) | ≥ 1240 MPa | ≥ 1000 MPa | High safety factor for turbine discs. |
| Elongation (δ5) | ≥ 12% | ≥ 15% | Ensures ductility and safety. |
| Creep Rupture (690MPa) | - | ≥ 100 Hours | Guarantees Long-term Service Life. |
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3. Corrosion Resistance of GH4169
GH4169 not only withstands high temperatures but also performs exceptionally well in corrosive environments. Its high chromium content (17-21%) and molybdenum content (2.8-3.3%) endow it with the following properties:
Oxidation Resistance: Forms a stable protective layer against scaling up to 980°C.
Pitting Resistance: Performs excellently in chloride environments.
Compliance with Acid Gas Standards: Our GH4169 is manufactured using processes compliant with NACE MR0175 / ISO 15156 standards, making it the material of choice for oil and gas downhole tools.
4. Advantageous application areas of GH4169 Alloy
As a Tier-1 Supplier, we provide GH4169 solutions that drive innovation in multiple sectors:
Aerospace Propulsion: Turbine discs, rings, engine shafts, and Aerospace Fasteners.
Oil & Gas: Downhole tools, wellhead components, and high-pressure valves requiring Industrial Durability.
Nuclear Power Generation: High-strength structural members and springs in reactor environments.
Cryogenic Engineering: Storage tanks for liquid hydrogen and oxygen (maintains toughness at -253°C).
Why Source GH4169 from Gnee Steel?
✅️Direct Factory Pricing: Benefit from Wholesale Pricing and eliminate middleman markups.
✅️VIM + VAR melting: We utilize double vacuum melting to ensure an ultra-pure material with Zero Inclusions.
✅️Global Compliance: Fully compliant with AMS 5662, AMS 5596, and ASTM B637 standards.
✅️Reliable Supplier: Every order is accompanied by a full EN 10204 3.1 Mill Test Certificate (MTC).
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FAQ
Q1: What is the primary difference between GH4169 and standard stainless steels?
A: Yield strength. While standard stainless steels soften rapidly above 500°C, GH4169 maintains a yield strength of over 850 MPa at 650°C, offering nearly 5 times the load-bearing capacity of high-temp stainless steels.
Q2: Can GH4169 be used in hydrogen-rich environments?
A: Yes. GH4169 has excellent resistance to hydrogen embrittlement, which is why it is widely used in rocket engine components and modern hydrogen storage systems.
Q3: Is GH4169 equivalent to Inconel 718?
A: Chemically and mechanically, yes. GH4169 is the Chinese designation that maps directly to the global Inconel 718 (UNS N07718) specification. Our GH4169 is produced to be globally interchangeable.
Q4: Do you offer precision grinding for aerospace fasteners?
A: Absolutely. We offer Custom Fabrication, including centerless ground bright bars with h8-h11 tolerances, specifically for the high-speed machining of aerospace bolts and studs.