For technical procurement personnel and metallurgical experts, the reliability of GH4169 superalloy is not merely a marketing claim, but a matter of precise elemental balance. The most critical challenge in procurement lies in ensuring the niobium (Nb) content is within the "golden range" of 4.75% to 5.50%.
The Importance of Niobium:
Niobium is the primary element forming the γ′ strengthening phase.
Small deviations in Nb content can lead to:
Aging Failure: Insufficient Nb content results in reduced hardness and creep strength.
Welding Risks: GH4169 is renowned for its delayed aging response, making it easy to weld without spontaneous cracking. This unique property depends entirely on the control of Nb content.
At Gnee Steel, we employ VIM + VAR (Vacuum Induction Melting + Vacuum Arc Remelting) technology to ensure that every gram of GH4169 we supply meets the most stringent chemical tolerances required by the aerospace and nuclear industries.
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Chemical Composition and Technical Standard of GH4169 Superalloy
Chemical Composition and Technical Standard of GH4169 Superalloy
GH4169 is a precipitation-hardening nickel-chromium-iron-based superalloy (equivalent to UNS N07718/Inconel 718), whose optimized design gives it high strength, corrosion resistance, and structural stability over a temperature range of -253℃ to 650℃. The main strengthening phases are Ni3Nb and Ni3(Al,Ti,Nb) phases. It is widely used in the aerospace, nuclear energy, and chemical industries.
What is the composition of GH4169 high-temperature alloy?
The chemical composition of GH4169 alloy is as follows: Ni 53.44, Cr 18.56, Mo 3.02, Nb 5.3, Al 0.44, Ti 1.04, C 0.026, P 0.005, S 0.001, B 0.002, Fe balance (weight percentage).
1. GH4169 Detailed Chemical Composition (GB/T 14992 / ASTM B637)
Our materials are processed to meet the highest purity levels, ensuring Industrial Durability and total compliance with international Inconel 718 equivalents.
| Element | Symbol | Percentage (%) | Role in GH4169 |
| Nickel | Ni | 50.0 - 55.0 | The base matrix for high-temp stability. |
| Chromium | Cr | 17.0 - 21.0 | Provides superior oxidation & corrosion resistance. |
| Niobium | Nb | 4.75 - 5.50 | Critical: Forms the
γ′′γ′′ strengthening phase. |
| Molybdenum | Mo | 2.80 - 3.30 | Enhances solid-solution strength and pitting resistance. |
| Titanium | Ti | 0.65 - 1.15 | Works with Al for precipitation hardening. |
| Aluminum | Al | 0.20 - 0.80 | Controls the aging response and oxidation. |
| Iron | Fe | Balance | Cost-effective matrix element for thermal stability. |
| Cobalt | Co | ≤ 1.0 | Trace element control for purity. |
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2. GH4169 Available Stock and Technical Standards
We offer a variety of GH4169 products (bars, plates, seamless pipe) conforming to the following global engineering specifications:
Aerospace Industry:
AMS 5662 / AMS 5663: High-quality bar and forging standards.
AMS 5596: Aerospace plate and strip standards.
Industrial and Energy:
ASTM B637: Precipitation-hardening nickel alloy standard for high-temperature applications.
ASTM B670: Nickel alloy plate standard.
Oil and Gas (Sulfur-containing environments):
NACE MR0175 / ISO 15156: Standard for downhole tools and valves fully compliant with hydrogen sulfide (H2S) environments.
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3 .GH4169 Alloy Properties
Key Characteristics: Excellent creep rupture strength at temperatures up to 650°C, superior fatigue resistance, and good weldability/machinability.
Microstructure: Contains a γ matrix, γ" strengthening phases, and phases for controlling grain size.
Common Heat Treatment: Includes solution treatment followed by two-stage aging (e.g., 720°C/8 h + 620°C/8 h, furnace cooling) to optimize precipitates.
Processing Technology: Typically produced using vacuum induction melting (VIM) + vacuum arc melting (VAR) processes.
Why choose to source from Gnee Steel manufacturer?
✅️VIM+VAR Melting: We eliminate inclusions and ensure ultra-low levels of Phosphorus (P ≤ 0.010%) and Sulfur (S ≤ 0.005%) for maximum fatigue life.
✅️MTC 3.1 Traceability: Every batch is delivered with a complete Mill Test Certificate documenting the heat analysis and standard compliance.
✅️Quality Assurance: As a certified Reliable Supplier, our materials are tested for grain size (ASTM E112) and ultrasonic integrity to ensure Zero-Defect quality.
✅️Custom Fabrication: We offer precision cutting, centerless grinding, and specialized heat treatment to match your exact project blueprints.
Gnee Steel GH4169 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 GH4169 Product Packing
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q1: What happens if the Niobium content falls below 4.75%?
A: Lower Niobium levels weaken the precipitation-hardening effect. The material will fail to reach the required yield strength (approx. 1030 MPa at room temp) and will have significantly shorter Stress-Rupture Life.
Q2: Is GH4169 chemically identical to Alloy 718?
A: Yes. GH4169 is the Chinese designation (GB standard), which maps directly to Inconel 718 (UNS N07718). Our GH4169 is produced to be globally interchangeable with Alloy 718.
Q3: Does GH4169 meet NACE MR0175 for the oil and gas industry?
A: Yes. When heat-treated to a maximum hardness of 40 HRC (for the solution annealed and aged state), our GH4169 is fully compliant with NACE MR0175, making it safe for sour gas service.
Q4: Can you provide third-party lab testing (SGS/TUV)?
A: Absolutely. We welcome Third-Party Inspection to verify the chemical heat analysis and ensure your Quality Assurance requirements are met.
