In high-risk fields such as aerospace propulsion, nuclear reactors, and deep-sea oil extraction, GH4169 superalloy (equivalent to Inconel 718) is the cornerstone of high-stress components. However, material inconsistency is a major challenge for purchasing managers and engineers.
Standard "commercial-grade" nickel alloys often contain "hidden killers"-trace impurities and macroscopic segregation ("freckles"), which can be the starting point for catastrophic fatigue failure.
At Gnee Alloy, we are committed to eliminating these risks. As a Tier 1 supplier, we employ a dual vacuum process of Vacuum Induction Melting (VIM) + Vacuum Arc Remelting (VAR) to ensure your critical components have absolute structural integrity and zero inclusions.
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GH4169 (Inconel 718) Nickel-Based Superalloy Manufacturer
GH4169 (Inconel 718) Nickel-Based Superalloy Manufacturer
GH4169 (equivalent to Inconel 718) is a high-performance, precipitation-hardening nickel-chromium-iron superalloy designed for extreme environments. It offers exceptional strength, corrosion resistance, and fatigue resistance, with a maximum temperature resistance of 700°C (1292°F). Due to its durability, GH4169 is widely used in the aerospace, gas turbine, and oil/gas industries.
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. Overview of GH4169 alloy materials
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Material Type | Wrought Nickel-based Superalloy |
| Strengthening Mechanism | γ″ + γ′ precipitation hardening |
| Product Forms | Bar, forging, plate, tube, strip, wire |
| Typical Applications | Turbine discs, compressor blades, fasteners, shafts, high-temperature structural components |
| Maximum Service Temperature (Load-Bearing) | 650 – 700°C |
2. Chemical composition table of GH4169 (Standard: GB/T 14992 / AMS 5662)
| Element | Symbol | Our Premium Grade (%) | Why it Matters |
| Nickel | Ni | 50.0 - 55.0 | Base for high-temp stability. |
| Chromium | Cr | 17.0 - 21.0 | Essential for oxidation resistance. |
| Niobium | Nb | 5.00 - 5.30 | Primary strengthening phase (
γ′′γ′′ ). |
| Molybdenum | Mo | 2.80 - 3.30 | Enhances creep & pitting resistance. |
| Phosphorus | P | ≤ 0.010 | Prevents hot-cracking during welding. |
| Sulfur | S | ≤ 0.005 | Maximizes fatigue durability. |
3. Mechanical properties of GH4169 (fully aged)
| Value | |
|---|---|
| Tensile Strength (σb) | ≥ 1240 MPa (at 20°C) |
| Yield Strength (σp0.2) | ≥ 850 MPa (at 650°C) |
| Elongation (δ5) | ≥ 12% |
| Hardness | 36 – 44 HRC |
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4. Stress fracture and creep properties of GH4169 alloy (aging condition)
| Property | Value | Test Condition | Engineering Significance |
|---|---|---|---|
| Stress Rupture Strength | ≥ 550 MPa | 650°C / 100h | Short-term high-temperature capability |
| Stress Rupture Strength | ≥ 450 MPa | 650°C / 1000h | Long-term service life |
| Stress Rupture Strength | ≥ 380 MPa | 700°C / 100h | Peak temperature capability |
| Stress Rupture Strength | ≥ 300 MPa | 700°C / 1000h | Extended high-temperature service |
| Stress Rupture Strength | ≥ 200 MPa | 760°C / 1000h | Maximum short-term |
| Creep Strength (0.1% creep) | ~350 MPa | 650°C / 1000h | Dimensional stability |
| Creep Strength (0.1% creep) | ~200 MPa | 700°C / 1000h | High-temperature dimensional stability |
| Stress Rupture Elongation | ≥ 5% | at rupture | Safety margin |
| Maximum Service Temperature (Load-Bearing) | 650 – 700°C | Long-term continuous | Design limit |
5. GH4169 alloy heat treatment scheme
| Step | Treatment | Temperature | Time | Cooling | Atmosphere |
|---|---|---|---|---|---|
| 1. Solution Treatment | Full solution | 954 – 982°C (1750-1800°F) | 1 hour per 25mm thickness | Rapid cooling (water or air) | Controlled atmosphere (vacuum or protective gas) |
| 2. First Aging | Age hardening | 718°C (1325°F) ± 8°C | 8 hours ± 15 min | Furnace cool to 621°C (50-55°C/h) | Controlled atmosphere |
| 3. Second Aging | Age hardening | 621°C (1150°F) ± 8°C | 8 hours ± 15 min | Air cool | – |
6. GH4169 alloy is available in standard products
| Product Form | Applicable Standards |
|---|---|
| Bar | AMS 5662, AMS 5663, ASTM B637, GB/T 14997, GB/T 14998 |
| Plate, Sheet, Strip | AMS 5596, ASTM B670, GB/T 14995, GB/T 14996 |
| Seamless Tube | AMS 5589, AMS 5590, ASTM B983, GB/T 14994 |
| Fasteners | AMS 5662, ASTM B637 |
7. Corrosion resistance of GH4169 alloy
| Environment | Resistance Level |
|---|---|
| Oxidizing Acids (HNO₃) | Good |
| Reducing Acids (HCl, H₂SO₄) | Poor |
| Chloride Pitting | Moderate |
| Chloride Stress Corrosion Cracking | Good (high Ni content) |
| Seawater | Limited |
| High-Temperature Oxidation | Good to 980°C |
8. Gnee Alloy GH4169 Alloy Applications
As a reliable supplier, Gnee Alloy offers GH4169-compliant solutions for applications including:
Aerospace: Turbine disks, engine shafts, and high-strength fasteners.
Nuclear Power: High-strength structural components and springs in reactor cores.
Oil & Gas: Downhole tools and wellhead assemblies compliant with NACE MR0175 standards.
Cryogenic Technology: Liquid hydrogen storage assemblies (remaining resilient at -253°C).
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅️Direct Factory Price: Eliminate middleman markups and save up to 20% on your procurement budget.
✅️MTC 3.1 Traceability: Every shipment is accompanied by a full Mill Test Certificate detailing heat analysis and grain size verification (Level 8 or finer).
✅️100% NDT Inspection: All bars, sheets, and tubes undergo Ultrasonic Testing (UT) to AMS 2154 Class A standards.
✅️Massive Inventory: Large stock of standard schedules (Sch 40, Sch 80) and rods ready for Fast Global Shipping.
Gnee Alloy 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 Alloy GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Is GH4169 truly interchangeable with Inconel 718?
A: Yes. GH4169 is the technische designation used in Chinese national standards (GB/T) for the exact same metallurgical system as UNS N07718. It is globally interchangeable and meets all international requirements for aerospace propulsion.
Q2: Why choose VIM+VAR over EAF+ESR?
A: For rotating parts, VIM+VAR is the only way to guarantee the level of purity and uniformity needed to prevent macro-segregation. If your part spins or carries extreme pressure, VIM+VAR is the mandatory Aerospace Grade choice.
Q3: Do you support small trial orders for material validation?
A: Absolutely. We support R&D and prototype development with Flexible MOQs on our in-stock inventory of bars and sheets.
Q4: Can you provide centerless grinding for precision rods?
A: Yes. We offer precision surface processing to achieve h8-h11 tolerances on our bright rods, ready for automated CNC machining.
