In aerospace, nuclear energy, and deep-sea energy fields, GH4169 superalloy (equivalent to Inconel 718) is a core material for high-stress components. However, for engineers and quality auditors, the main pain points lie in microstructure segregation and impurity control.
Standard arc-melted materials often contain "hidden killers"-trace inclusions that can become initiation points for fatigue cracks. To ensure absolute structural integrity, advanced design schemes specify the use of VIM+VAR (double vacuum melting) processes. Our GH4169 material is specially purified to meet the most stringent AMS 5662 and ASTM B637 standards, providing the ultra-high purity required for your safety-critical designs.
Chemical Composition and Technical Standard of GH4169 Superalloy
Chemical Composition and Technical Standard of GH4169 Superalloy
GH4169 is a niobium-modified nickel-chromium-iron-based precipitation-strengthened forged superalloy with performance comparable to Inconel 718. It is renowned for its excellent overall performance over a temperature range of -253°C to 650°C (with short-term applications up to 700°C).
It is primarily used in high-temperature fasteners, turbine disks, casings, and blades for aerospace and industrial gas turbines.
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718).
1. Chemical composition table of GH4169 (Standard: GB/T 14992 / AMS 5662):
| Element | Symbol | Percentage (%) | Role in Metallurgy |
| Nickel | Ni | 50.0 - 55.0 | Matrix 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. |
| Molybdenum | Mo | 2.80 - 3.30 | Enhances pitting & creep-rupture strength. |
| Titanium | Ti | 0.65 - 1.15 | Works with Al for aging response. |
| Aluminum | Al | 0.20 - 0.80 | Controls grain size and thermal stability. |
| Iron | Fe | Balance | Cost-effective matrix element. |
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2. GH4169 alloy technical standards and specifications
As a Tier 1 manufacturer, Gnee Alloy effectively addresses the complexities of international material sourcing. Our materials fully comply with the following standards:
Chinese Standards
GB/T 14992: Classification and Designation of Superalloys
GB/T 14994: Technical Conditions for Delivery of Nickel-Based Superalloy Wrought Rods
HB 6701: GH4169 Alloy Wrought Bars
HB 6702: GH4169 Alloy Plates
International Equivalents
UNS: N07718
ASTM: B637 (Rods), B670 (Plates)
AMS: 5596 (Sheet), 5662/5663/5664 (Bars/Forgings)
W.Nr: 2.4668
Nuclear Energy: ASME BPVC Volume 3.
Oil & Gas: NACE MR0175 / ISO 15156 (Compliant with acidic environments).
Click to view our professional certificates for GH4169 alloy
3. Gnee Alloy GH4169 Alloy Process
We employ a dual vacuum melting process to eliminate the risk of macroscopic segregation (spots):
Vacuum Induction Melting (VIM): Removes dissolved gases, ensuring perfect balance in chemical composition analysis.
Vacuum Arc Remelting (VAR): Controls the solidification rate, resulting in a fine-grained structure and extremely high homogeneity.
Commercial Value: Compared to commercially available steel melted in an electric arc furnace, our VIM+VAR GH4169 material offers a 30% longer service life, thereby reducing your total cost of ownership.
VIM+VAR process
3. GH4169 Main Properties and Heat Treatment
GH4169 is designed with a high niobium content, resulting in a large volume fraction of precipitates, giving it excellent yield strength even at temperatures up to 650°C.
Service Temperature: Long-term up to 650°C, short-term up to 700°C.
Tensile Strength: High tensile strength (>1000 MPa at room temperature) and good ductility.
Fatigue Resistance: Excellent high-cycle fatigue resistance.
Weldability: Excellent weldability compared to other high-temperature alloys.
Typical Heat Treatment
GH4169 requires precise two-stage aging treatment to achieve optimal performance.
1. Solution Treatment: 940°C - 1050°C (depending on grain size requirements), air cooling or quenching.
2. Aging 1: 720°C + 10°C, hold for 8 hours, furnace cooling.
3. Aging time 2: 620°C + 10°C, heat preservation for 8 hours. Air-cooled.
Contact us to customize GH4169 products to fit your project dimensions
Why Source From Gnee Steel?
✅️Reliable Supplier: Decades of experience supplying certified GH4169 to global OEMs.
✅️Total Traceability: Every bar/sheet is heat-number stamped with a full EN 10204 3.1 MTC.
✅️Wholesale Inventory: Large stock of standard sizes ready for Immediate Dispatch.
✅️Custom Fabrication: We offer precision cutting, centerless grinding (h8-h11), and custom forgings.
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 GH4169 Alloy
FAQ
Q1: Is GH4169 exactly the same as Inconel 718?
A: Yes. GH4169 is the technical designation used in Chinese national standards (GB/T) for the metallurgical system known globally as Inconel 718 (UNS N07718). They are globally interchangeable.
Q2: Why is the Niobium content so critical?
A: Niobium (4.75-5.5%) is the key strengthening element. If the Nb level is too low, the material won't reach its peak yield strength of 1030 MPa after aging. If too high, it leads to the formation of brittle phases. Our VIM process ensures Nb is always in the "Golden Zone."
Q3: Can your material pass aerospace Ultrasonic Testing (UT)?
A: Absolutely. Our VIM+VAR material is verified to pass AMS 2154 Class A or AAA standards, ensuring it is safe for high-speed rotating engine parts.
Q4: Do you support small trial orders?
A: Yes. We support prototype development and laboratory validation with Flexible MOQs for certified specimens and test coupons.
