Many projects specify the use of the high-performance GH4169 (equivalent to Inconel 718) due to its record-breaking yield strength. However, GH4169 is a precipitation-strengthened alloy. Its strengthening phase (γ′′) begins to dissolve once the temperature exceeds 700°C (1292°F). In contrast, GH3536 (equivalent to Hastelloy X) is a solid solution-strengthened alloy that maintains its industrial durability even in the event of 718 failure.
At Gnee Alloy, we offer certified materials to meet your specific heat load requirements, ensuring the integrity of your structure.
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Difference of properties after heat treatment between GH4169 and GH3536 alloys
Difference of properties after heat treatment between GH4169 and GH3536 alloys
Heat treatment of GH4169 and GH3536 alloys (commonly used in additive manufacturing) produces different property changes depending on their strengthening mechanisms: GH4169 relies on the precipitation of γ''/γ' phases to achieve high strength, while GH3536 utilizes solid solution strengthening to improve stability. After heat treatment, the hardness and strength of GH4169 are significantly improved, while the ductility of GH3536 is increased and the hardness is reduced, thereby improving its uniformity.
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. GH4169 and GH3536 Material Overview
| Parameter | GH4169 (Inconel 718) | GH3536 (Hastelloy X) |
|---|---|---|
| UNS Number | N07718 | N06002 |
| Material Type | Wrought Nickel-based Superalloy | Wrought Nickel-based Superalloy |
| Strengthening Mechanism | γ″ + γ′ precipitation hardening | Solid-solution strengthening (Mo + Cr) |
| Product Forms | Bar, forging, plate, tube, strip | Bar, plate, tube, strip |
| Typical Applications | Turbine discs, fasteners, shafts, high-strength components | Combustion chambers, transition ducts, flame holders |
| Maximum Service Temperature | ~650 – 700°C | ~800 – 900°C |
2. Comparison of chemical composition of GH4169 and GH3536 (wt%)
| Element | GH4169 (Inconel 718) | GH3536 (Hastelloy X) | Key Difference |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | Balance (~≥65) | GH3536 has higher Ni |
| Chromium (Cr) | 17.0 – 21.0 | 20.5 – 23.0 | GH3536 has higher Cr |
| Iron (Fe) | Balance (~18-20) | 17.0 – 20.0 | GH4169 slightly higher Fe |
| Molybdenum (Mo) | 2.80 – 3.30 | 8.0 – 10.0 | GH3536 has ~3x more Mo |
| Cobalt (Co) | ≤ 1.00 | 0.5 – 2.5 | GH3536 contains Co |
| Tungsten (W) | – | 0.2 – 1.0 | GH3536 contains W |
| Niobium (Nb) | 4.75 – 5.50 | – | GH4169 unique – γ″ former |
| Titanium (Ti) | 0.65 – 1.15 | – | GH4169 unique |
| Aluminum (Al) | 0.20 – 0.80 | – | GH4169 unique |
| Carbon (C) | ≤ 0.08 | 0.05 – 0.15 | GH3536 higher C |
| Manganese (Mn) | ≤ 0.35 | ≤ 1.00 | GH3536 higher |
| Silicon (Si) | ≤ 0.35 | ≤ 1.00 | GH3536 higher |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.040 | – |
| Sulfur (S) | ≤ 0.015 | ≤ 0.030 | – |
| Boron (B) | 0.002 – 0.006 | ≤ 0.010 | – |
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3. Comparison of room temperature mechanical properties of GH4169 and GH3536
| Property | GH4169 (718) (Aged) | GH3536 (X) (Annealed) | Advantage |
|---|---|---|---|
| Tensile Strength, Ultimate (MPa) | ≥ 1275 (185 ksi) | ≥ 760 (110 ksi) | GH4169 (~68% higher) |
| Tensile Strength, Yield (MPa) | ≥ 1035 (150 ksi) | ≥ 355 (52 ksi) | GH4169 (~190% higher) |
| Elongation (%) | ≥ 12 | ≥ 40 | GH3536 |
| Reduction of Area (%) | ≥ 15 | ≥ 50 | GH3536 |
| Hardness | 35 – 40 HRC | ~92 HRB (~20 HRC) | GH4169 |
| Modulus of Elasticity (GPa) | ~200 | ~205 | Similar |
| Density (g/cm³) | 8.19 | 8.28 | GH4169 lighter |
4. Comparison of yield strength between GH4169 and GH3536
| Temperature (°C/°F) | GH4169 (Precipitation Hardened) | GH3536 (Solid Solution) | Industrial Verdict |
| 20°C (Room Temp) | ≥ 1030 MPa | ~ 350 MPa | GH4169 for Elite Static Loads. |
| 700°C (1292°F) | ≥ 850 MPa | ~ 240 MPa | GH4169 for Turbine Parts. |
| 850°C (1562°F) | Softens (Over-aged) | ~ 180 MPa | Transition Zone to GH3536. |
| 900°C (1652°F) | FAILED (No load capacity) | **~ 150 MPa (Stable)** | GH3536 for extreme fire zones. |
Performance Differences between GH4169 and GH3536
GH4169: Advantages of Double Aging
GH4169 achieves superior performance through rigorous solution treatment and double aging cycles (typically 718°C/8h + 621°C/8h).
Advantages: Formation of the γ′′ (γ′) phase, which efficiently pins grain boundaries.
Disadvantages: These precipitated phases are unstable. Above 750°C, they coarsen or transform into the weaker δ phase, leading to sudden creep failure.
GH3536: Stability of the Solid Solution
GH3536 is typically supplied in a solution-treated state (1150°C - 1175°C, rapid quenching).
Advantages: Relies on chromium, molybdenum, and tungsten atoms to distort the nickel lattice. Due to the absence of particle "aging," this material maintains stable oxidation resistance at temperatures up to 1200°C.
Disadvantages: Compared with aging high-temperature alloys, the yield strength at room temperature is lower.
7. GH4169 and GH3536 Application Matrix
Gnee Alloy, a reliable supplier, offers two grades of steel, both finished using VIM + VAR processes to ensure zero defects in internal integrity.
If you are designing turbine discs, engine shafts, or high-pressure fuel lines operating at temperatures strictly below 650°C, order GH4169 seamless steel tubing/bars.
If you are manufacturing combustion chamber linings, afterburner components, furnaces, or petrochemical reactors subjected to circulating heating up to 950°C, order GH3536 plates/sheets.
Contact us to customize GH4169 products to fit your project dimensions
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
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: Can I use GH4169 at 800°C if the load is very low?
A: It is risky. Even under low load, the microstructure changes permanently above 750°C. The material will over-age and lose its ductility. For static parts at 800°C, GH3030 or GH3536 is much more Cost-effective Solution.
Q2: Which alloy has better weldability for complex manifolds?
A: GH4169 wins on weldability. Its delayed aging response allows it to be welded without the spontaneous strain-age cracking that plagues other superalloys. GH3536 is also highly weldable but requires more control over thermal fatigue in the weld zone.
Q3: Is GH4169 interchangeable with Inconel 718 in my blueprint?
A: Absolutely. GH4169 is the technical equivalent of Inconel 718. We provide materials that comply with AMS 5662, AMS 5596, and ASTM B637, ensuring Global Compliance.
Q4: Do you offer cut-to-size services for thick plates?
A: Yes. We offer precision laser and waterjet Cut-to-Size blanks ready for your assembly line, reducing your material waste and labor costs.
