For engineers manufacturing turbine discs, engine shafts, or large structural rings, GH4169 (equivalent to Alloy 718) forged bars represent a high-risk investment. The biggest pain point in the industry is centerline porosity and internal voids.
Risk: You invest thousands of dollars in material and hundreds of hours of machining time, only to discover a center crack or "freckle"-like segregation during final precision machining. The result? Loss of material, time, and project schedule.
At Gnee Alloy, we eliminate this risk factor. As a Tier 1 manufacturer, Gnee Alloy focuses on heavy-duty forgings and offers a 100% guarantee of internal integrity.
Check the inventory and pricing of large-diameter GH4169 round bars
Gh4169 High Temperature Alloy Forged Rod for Aerospace
Gh4169 High Temperature Alloy Forged Rod for Aerospace
GH4169 round bar is a high-quality nickel-chromium-iron-based precipitation-hardening forged nickel-based superalloy bar (equivalent to Inconel 718) designed for high-performance aerospace applications. It exhibits excellent tensile strength, fatigue strength, and creep strength over a temperature range of -253°C to 650°C (short-term up to 800°C). Forged bars are widely used in critical, high-stress, high-temperature components of aircraft engines.
What is the composition of GH4169 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 (wt.%).
1. GH4169 Forged Bar Standard Specifications
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | Aerospace Grade Forged Bar |
| Manufacturing Process | Vacuum Induction Melting (VIM) + Vacuum Arc Remelting (VAR) + Forging |
| Surface Condition | Black (as-forged) / Rough Turned / Bright (ground/peeled) |
| Applicable Standards | AMS 5662, AMS 5663, ASTM B637, GE S400, PWA 1009 |
| Melting Process | VIM + VAR (double melt – mandatory) |
Click to view our professional certificates for GH4169 alloy
2. GH4169 Forged Bar Technical Specifications and Scope of Supply
| Diameter Range | Supply State | Surface Finish | Integrity Standard |
| 100mm - 250mm | Solution Treated | Peeled / Smooth | AMS 2154 Class A |
| 250mm - 450mm | Hot Forged | Rough Machined | AMS 2154 Class AA |
| Length | Up to 6000mm | Cut-to-Length | 100% Traceability |
3.Mechanical properties of GH4169 forged bar at 650°C (fully aged)
| Property | Value |
|---|---|
| Yield Strength (σp0.2) | ≥ 850 MPa |
| Tensile Strength | ≥ 1000 MPa |
| Microstructure | Refined grain size (ASTM E112 Level 8 or finer) |
Click to download the GH4169 alloy PDF file now
4. GH4169 Forged Bar Dimensions and Specifications
| Parameter | Range | Tolerance |
|---|---|---|
| Diameter (Round) | 50 mm – 500 mm (2″ – 20″) | ±1.5 mm – ±3.0 mm |
| Thickness (Flat/Block) | 25 mm – 300 mm (1″ – 12″) | ±1.5 mm – ±4.0 mm |
| Length | 500 mm – 5000 mm (20″ – 200″) | +5 mm – 0 mm |
| Straightness | – | ≤ 1.0 mm/m |
Common Forged Bar Sizes:
| Diameter (mm) | Diameter (in) | Typical Application | Weight (kg/m) |
|---|---|---|---|
| 50 – 100 | 2 – 4 | Small shafts, fasteners | 16 – 64 |
| 100 – 200 | 4 – 8 | Turbine discs, medium shafts | 64 – 256 |
| 200 – 300 | 8 – 12 | Large turbine discs, rings | 256 – 576 |
| 300 – 500 | 12 – 20 | Large engine components, landing gear | 576 – 1600 |
Surface Conditions Available:
| Condition | Description | Typical Use |
|---|---|---|
| Black (As-Forged) | Oxide scale present | Rough machining, forging stock |
| Rough Turned | Machined to remove scale | General machining, inspection |
| Bright (Ground/Peeled) | Precision ground or peeled | Finished component, direct use |
Contact us to customize GH4169 products to fit your project dimensions
4. GH4169 forged bar industrial applications
As a Reliable Supplier, we provide certified forgings for:
Aerospace: Turbine engine shafts, discs, and high-load structural rings.
Oil & Gas: Large diameter downhole tool joints and wellhead components (NACE MR0175 compliant).
Nuclear Power: Reactor core structural members and high-strength fasteners.
Heavy Industry: Large diameter industrial rollers and high-temp shafts.
Why choose Gnee Alloy?
✅️Wholesale Inventory: Massive stock of forged rods ready for Immediate Dispatch, reducing your lead time from months to days.
✅️Direct Factory Price: Eliminate middleman markups and secure the best rates for high-tonnage orders.
✅️MTC 3.1 Traceability: Full heat-analysis and ultrasonic testing reports included with every shipment.
✅️Custom Fabrication: We offer precision bandsaw cutting to deliver ready-to-machine blanks, minimizing your material waste.
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: How do you prevent "Freckles" (Segregation) in 400mm bars?
A: "Freckles" are a result of poor VAR solidification. We use advanced computer-controlled Vacuum Arc Remelting to strictly manage the pool depth and cooling rate, ensuring a perfectly homogeneous microstructure across the entire 450mm diameter.
Q2: Is GH4169 interchangeable with Inconel 718 for large shafts?
A: Yes. GH4169 is the technical equivalent of Inconel 718. Our forged bars meet and often exceed AMS 5662 and ASTM B637 requirements, making them globally interchangeable for critical parts.
Q3: Do you offer "Near-Net Shape" forged rings?
A: Absolutely. In addition to round bars, our Custom Fabrication shop can forge GH4169 into rings and discs to your exact dimensions, saving you up to 30% in machining costs.
Q4: What is the Straightness tolerance for your large forged rods?
A: We provide rough machined rods with straightness tolerances of ≤ 1.0mm/m, ensuring stable CNC setup for heavy shafts.
