In the highly competitive field of high-performance materials, GH4169 superalloy is the most widely used nickel-based alloy globally. Widely recognized as an alternative to Inconel 718, GH4169 is a precipitation-hardening nickel-chromium alloy containing significant amounts of niobium, molybdenum, and chromium.
GH4169's advantage lies in its versatility. It combines high strength (up to 700°C), excellent corrosion resistance, and superior weldability. For engineers and purchasing managers, GH4169 is ideal for mission-critical components, capable of withstanding extreme thermal and mechanical stresses, offering a cost-effective and practical solution.
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GH4169 High Temperature Alloy (Inconel 718): Properties, Specifications, and Industrial Applications
GH4169 High Temperature Alloy (Inconel 718): Properties, Specifications, and Industrial Applications
GH4169, globally known as Inconel 718 (UNS N07718), is a precipitation-hardening nickel-based superalloy designed to provide exceptional strength and corrosion resistance at high temperatures, particularly in the range of -253°C to 650°C. It features high tensile strength, fatigue resistance, and creep resistance (up to 700°C), making it widely applicable in extreme environments, especially in the aerospace and energy industries.
What are the high-temperature properties of INCONEL 718?
Alloy 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). Alloy 718 exhibits a slow age-hardening response, therefore it does not undergo spontaneous hardening during heating and cooling, allowing for annealing and welding.
1. Key Pain Points We Can Solve for GH4169
Procuring high-temperature alloys like GH4169 is extremely risky. Buyers typically face three major challenges:
Material Integrity: Are there inclusions or "spots" within the alloy? (We use Vacuum Ion Melting (VIM) + Vacuum Argon Arc Melting (VAR) processes to ensure ultra-high purity).
Standard Compliance: Does it comply with aerospace specifications such as AMS 5662? (We provide complete MTC 3.1 traceability).
Delivery Time: Can it be delivered quickly to meet maintenance and overhaul needs? (We have a large wholesale inventory and can ship immediately).
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2. Detailed chemical composition analysis of GH4169
Precision in chemical composition is fundamental to structural integrity. Our GH4169 is refined using a vacuum induction melting (VIM) process, followed by a vacuum arc remelting (VAR) process to ensure its homogeneity.
| Element | Symbol | Percentage (%) | Role in Alloy |
| Nickel | Ni | 50.0 - 55.0 | The base for high-temp stability. |
| Chromium | Cr | 17.0 - 21.0 | Essential for oxidation & corrosion resistance. |
| Niobium | Nb | 4.75 - 5.50 | Primary strengthening phase (
γ′′γ′′ ). |
| Molybdenum | Mo | 2.80 - 3.30 | Enhances creep and pitting resistance. |
| Titanium | Ti | 0.65 - 1.15 | Secondary precipitation hardening (
γ′γ′ ). |
| Aluminum | Al | 0.20 - 0.80 | Controls aging and oxidation scaling. |
| Iron | Fe | Balance | Cost-effective matrix element. |
3. Mechanical properties and technical specifications of GH4169
Our materials are designed for industrial durability, maintaining excellent yield strength even at high temperatures of 650°C (1200°F).
Key Mechanical Properties (Fully Aged State):
| Property | Value at 20°C | Value at 650°C |
| Tensile Strength (MPa) | ≥ 1240 | ≥ 1000 |
| Yield Strength (0.2% MPa) | ≥ 1030 | ≥ 850 |
| Elongation (%) | ≥ 12 | ≥ 15 |
| Fatigue Life | Exceptional | Stable |
4. GH4169 Global Standards:
Aerospace: AMS 5662 (bars), AMS 5596 (plates), AMS 5589 (seamless tubes).
Industrial: ASTM B637, ASTM B670, ASME SB637.
Oil & Gas: NACE MR0175 (suitable for acidic gas environments).
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5. Applications of GH4169 alloy
As a Tier-1 Supplier, we provide GH4169 solutions for the world's most critical sectors:
Aerospace Propulsion: Turbine discs, engine shafts, fasteners, and combustion liners.
Nuclear Engineering: High-strength structural supports and springs.
Oil & Gas: High-pressure downhole tools, wellhead components, and valves.
Cryogenics: Liquid hydrogen tanks and structural parts (maintains toughness at -253°C).
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FAQ
Q1: Is GH4169 exactly the same as Inconel 718?
A: Yes. GH4169 is the Chinese designation that maps directly to Inconel 718 (UNS N07718). They share identical chemical and mechanical properties, making them globally interchangeable in international engineering.
Q2: What makes GH4169 better at welding than other superalloys?
A: GH4169 has a delayed aging response. This allows it to be welded in the solution-treated state without the high risk of "strain-age cracking" that plagues other nickel-based materials.
Q3: Can GH4169 be used in cryogenic environments?
A: Absolutely. It maintains excellent ductility and fracture toughness at sub-zero temperatures (down to -253°C), making it a staple for the Space Exploration industry.
Q4: Do you offer trial orders for non-standard sizes?
A: Yes. We support prototype development and can provide small-batch custom forgings or precision-ground bars to verify material quality for your project.