GH4169(inconel 718) bright rod used for aerospace Industry
GH4169(inconel 718) bright rod used for aerospace Industry
GH4169 (Inconel 718) bright bar stock is a high-quality nickel-chromium precipitation-hardening superalloy, an indispensable material in the aerospace field. It maintains excellent strength and superior corrosion and fatigue resistance even at temperatures of 650-700℃. Its bright surface treatment (typically polishing or cold drawing) ensures high-precision dimensions for critical fasteners, turbine engine parts, and key flight components, conforming to AMS 5662/5663 standards.
Why is Inconel 718 difficult to machine?
Inconel 718 is a nickel-based superalloy. Its high hardness, low thermal diffusivity, and extremely high strength at high temperatures make it one of the most difficult materials to machine.
1.GH4169 Round Bar Range and Applicable Standards
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | Bright Bar – Cold Drawn / Ground / Peeled |
| Surface Condition | Bright – oxide-free, smooth finish |
| Aerospace Standards | AMS 5662, AMS 5663, ASTM B637, GE S400, PWA 1009 |
2. GH4169 Round Bar Chemical Composition (wt%) – Aerospace Grade
| Element | Content (%) | AMS 5662 / 5663 Requirement | Function |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 50.0 – 55.0 | Matrix element; provides high-temperature stability and corrosion resistance |
| Chromium (Cr) | 17.0 – 21.0 | 17.0 – 21.0 | Oxidation and corrosion resistance |
| Iron (Fe) | Balance (~18-20) | Balance | Fe-Ni-Cr base alloy |
| Niobium (Nb) | 4.75 – 5.50 | 4.75 – 5.50 | Core strengthening element – forms γ″ (Ni₃Nb) |
| Molybdenum (Mo) | 2.80 – 3.30 | 2.80 – 3.30 | Solid-solution strengthening; enhances creep and pitting resistance |
| Titanium (Ti) | 0.65 – 1.15 | 0.65 – 1.15 | Forms γ′ strengthening phase (Ni₃(Al,Ti)) |
| Aluminum (Al) | 0.20 – 0.80 | 0.20 – 0.80 | Forms γ′ strengthening phase |
| Carbon (C) | ≤ 0.08 | ≤ 0.08 | Low carbon for toughness and fatigue resistance |
| Manganese (Mn) | ≤ 0.35 | ≤ 0.35 | Deoxidizer |
| Silicon (Si) | ≤ 0.35 | ≤ 0.35 | Deoxidizer |
| Phosphorus (P) | ≤ 0.010 | ≤ 0.015 (AMS stricter) | Ensures toughness |
| Sulfur (S) | ≤ 0.005 | ≤ 0.015 (AMS stricter) | Ensures hot workability |
| Boron (B) | 0.002 – 0.006 | 0.002 – 0.006 | Grain boundary strengthener |
| Cobalt (Co) | ≤ 1.00 | ≤ 1.00 | Residual element |
| Copper (Cu) | ≤ 0.30 | ≤ 0.30 | Residual element |
Click to download the GH4169 alloy PDF file now
3. GH4169 round bar dimensional accuracy
We employ state-of-the-art centerless grinding technology to produce bars that meet the most demanding requirements of automated feeders and Swiss-type lathes.
| Feature | Specification Detail | Industrial Advantage |
| Tolerance Class | h8, h9, h10 | Perfect fit for precision collets & bushings. |
| Straightness | ≤ 0.5 mm / meter | Eliminates vibration in high-speed CNC turning. |
| Surface Roughness | Ra ≤ 0.4 μm | Smooth Finish; reduces secondary polishing. |
| Diameter Range | 2.0 mm to 100.0 mm | Comprehensive coverage for bolts and shafts. |
4. The main applications of GH4169 round bars in the aerospace field include
Jet engine components: turbine blades, guide vanes, impellers, and combustion chambers.
Fasteners and hardware: high-strength, corrosion-resistant bolts, nuts, and fasteners.
Structural components: engine casings, springs, and rocket engine components.
5. Key Properties of GH4169 Bar Stock
High Temperature Performance: Maintains high creep rupture strength and tensile strength at temperatures up to 700°C, making it ideal for jet engine blades, fasteners, and turbine disks.
Bright Surface: Indicates precision manufacturing processes (cold drawing or bright annealing), reducing surface defects and improving corrosion resistance, crucial for aerospace components.
High Strength at Low Temperatures: Maintains high strength and fatigue resistance at low temperatures, suitable for spacecraft and rocket engines.
Excellent Machining Properties: Offers excellent weldability and crack resistance during welding, enabling complex assemblies.
Standards: Typically supplied according to AMS 5662 or AMS 5663 specifications.
6. Why choose Gnee Alloy, a Tier 1 aerospace supplier?
As a Reliable Supplier to the global aerospace industry, we provide total transparency:
✅️MTC 3.1 Traceability: Full heat-analysis and ultrasonic testing (UT) results included with every batch.
✅️AS9100 Certified: Manufactured under the highest aviation quality management protocols.
✅️Solution Annealed State: We supply rods in an optimized solution-treated state (approx. 20-25 HRC) to reduce tool wear during roughing, followed by final aging to reach peak strength.
✅️Direct Factory Price: Save significantly by purchasing directly from a specialized superalloy manufacturer.
Gnee Steel GH4169(inconel 718) Certificate
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Is your GH4169 bright rod equivalent to Inconel 718 for aerospace fasteners?
A: Yes. GH4169 is the technical equivalent of Inconel 718 (UNS N07718). Our material meets all international requirements for AMS 5662 and ASTM B637, ensuring it is a globally accepted Cost-effective Solution.
Q2: How do your ground rods help reduce tool wear?
A: By providing a consistent Precision Ground surface with uniform hardness, we eliminate the "hard spots" and scale found on standard peeled bars. This allows for stable feed rates and predictable tool life, significantly lowering your per-part cost.
Q3: Can you provide large-diameter forged and ground rods for engine shafts?
A: Absolutely. While we specialize in bright rods up to 50mm, we also maintain a Wholesale Inventory of forged and rough-machined rods up to 400mm diameter, all with certified internal integrity (UT Class A).
Q4: Do you offer cut-to-length services for small production runs?
A: Yes. We offer precision bandsaw cutting to provide ready-to-machine blanks, saving you material waste and extra labor on your shop floor.
