In high-risk industries such as aerospace, nuclear power, and deep-sea oil extraction, a major challenge for engineers is high-cycle fatigue failure. Often, the culprit is not the primary elements (nickel, chromium, niobium), but rather uncontrolled trace impurities such as phosphorus (P), sulfur (S), and lead (Pb).
Even within GB or ASTM standards, "commercial grade" GH4169 may contain trace elements that can migrate to grain boundaries under extreme stress, leading to grain boundary embrittlement.
At Gnee Steel, we eliminate this risk through superior purity control. We understand that for engine turbine discs or high-pressure fasteners, chemical composition is fundamental to structural integrity.
Request a Sample MTC for GH4169 Chemical Verification
Detailed Chemical Composition of GH4169 Nickel Alloy
Detailed Chemical Composition of GH4169 Nickel Alloy
GH4169 is a precipitation-hardening nickel-chromium-iron-based superalloy (equivalent to Inconel 718) designed for high strength, fatigue resistance, and corrosion resistance at temperatures up to 650°C. Its main components include approximately 50-55% nickel, 17-21% chromium, approximately 5% niobium and tantalum, and a significant amount of iron, and it is designed for aerospace and nuclear applications.
Is Inconel 718 a nickel-based superalloy?
Inconel 718 is a nickel-based superalloy, ideal for applications requiring high strength to be maintained over a temperature range from low temperatures to 1400°F (760°C).
1. GH4169 Chemical Composition Table (Standard and Advanced Reference Standards)
Our manufacturing process strictly adheres to AMS 5662 and ASTM B637, but our internal "Aerospace Grade" control is even more rigorous to ensure Maximized Fatigue Life.
| Element | Symbol | Standard Range (%) | Our "Premium" Control | Role in GH4169 |
| Nickel | Ni | 50.00 - 55.00 | 52.50 - 54.00 | Provides the base for thermal stability. |
| Chromium | Cr | 17.00 - 21.00 | 18.50 - 20.00 | Essential for oxidation resistance. |
| Niobium | Nb | 4.75 - 5.50 | 5.00 - 5.30 | Critical: Forms the
γ′′γ′′ strengthening phase. |
| Molybdenum | Mo | 2.80 - 3.30 | 2.95 - 3.15 | Enhances creep-rupture strength. |
| Titanium | Ti | 0.65 - 1.15 | 0.85 - 1.05 | Works with Al for precipitation hardening. |
| Aluminum | Al | 0.20 - 0.80 | 0.45 - 0.60 | Controls the aging response. |
| Iron | Fe | Balance | Balance | Cost-effective matrix element. |
Strict impurity control:
| Element | Phosphorus (P) | Sulfur (S) | Boron (B) | Lead (Pb) | Zirconium (Zr) |
| Standard Spec | ≤ 0.015% | ≤ 0.015% | ≤ 0.006% | ≤ 0.001% | ≤ 0.010% |
| Our Standard | ≤ 0.010% | ≤ 0.005% | 0.003-0.005% | ≤ 0.0005% | ≤ 0.005% |
Click to download the GH4169 alloy PDF file now
2. VIM + VAR Double Melting: The Gold Standard for GH4169
To achieve this level of elemental precision, we utilize the VIM + VAR Double Melting Process, which is mandatory for Aerospace Grade Inconel 718 equivalents.
VIM (Vacuum Induction Melting): Performed under high vacuum to remove dissolved gases (O, N, H) and ensure a perfectly balanced base chemistry.
VAR (Vacuum Arc Remelting): The ingot is remelted under a vacuum arc, which eliminates inclusions, removes "freckles" (solute-rich spots), and ensures a Homogeneous Microstructure.
Result: A material with zero internal porosity and ultra-clean grain boundaries, significantly reducing the risk of premature fatigue cracking in your critical assemblies.
Click to contact us for a technical quote for GH4169
3. GH4169 Global Standard Compliance
Our GH4169 material is meticulously designed to meet and exceed global engineering specifications, making it a perfect replacement for Inconel 718 (UNS N07718).
Aerospace: AMS 5662 (bars/forgings), AMS 5596 (plates/sheets).
Industrial: ASTM B637, ASTM B670.
Nuclear: ASME BPVC Volume 3.
Oil & Gas: NACE MR0175 (suitable for acidic environments).
Why Choose Gnee Steel for GH4169?
✅️Tier 1 Supplier Reliability: We provide reliable products to aerospace engine manufacturers and nuclear power plants.
✅️Factory Direct Pricing: Eliminating middlemen and markups ensures the most competitive wholesale inventory prices.
✅️100% Traceability: Every order comes with an EN 10204 3.1 Factory Test Certificate (MTC) detailing chemical composition analysis results.
✅️Custom Machining: We offer precision cutting, centerless grinding, and professional heat treatment services.
Gnee Steel 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 Steel GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Why is Boron (B) added in such a narrow range (0.003-0.006%)?
A: Boron is a "double-edged sword." In controlled amounts, it strengthens the grain boundaries, improving creep-rupture life. Too much Boron, however, leads to welding issues. Our VIM process ensures Boron is kept in the "Golden Range" for optimal performance.
Q2: How does low Sulfur (S) affect the material?
A: Low Sulfur (≤ 0.005%) is critical for hot workability and surface integrity. It prevents the formation of low-melting-point sulfides that can cause "Hot Shortness" during forging or welding.
Q3: Is your GH4169 equivalent to Nimonic 90 or Inconel 718?
A: GH4169 is the direct equivalent of Inconel 718 (UNS N07718). It is a different metallurgical system than Nimonic 90.
Q4: Do you provide certification for cryogenic applications?
A: Yes. GH4169 is excellent for liquid hydrogen service. We can provide additional Charpy impact testing at -196°C to verify material toughness for cryogenic projects.
