For machining plants specializing in aerospace fasteners and engine shafts, GH4169 (equivalent to Alloy 718) bar stock is a critical material. Purchasing managers face three major challenges when using automated bar feeders and Swiss-type lathes:
Automatic feeder jamming: Inconsistent diameters of standard hot-rolled or peeled bars. Even a deviation of 0.05 mm can cause jamming, resulting in hours of downtime and unbilled losses.
Rapid work hardening and tool damage: Poorly annealed material becomes "diamond-hard" upon tool contact, causing carbide inserts to break and increasing tooling procurement budgets.
Surface roughness: Rough surface finishes (Ra > 1.6 microns) require expensive secondary grinding to meet stringent aerospace audit requirements.
At Gnee Alloy, we are committed to eliminating these bottlenecks. Our precision-ground GH4169 bars are designed for high-speed automated machining, ensuring your production is both profitable and defect-free.
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GH4169 Inconel 718 15*500MM Nickel Alloy Rod Buying Guide
GH4169 Inconel 718 15*500MM Nickel Alloy Rod Buying Guide
This purchasing guide provides important information on technical specifications, material properties, and sourcing for GH4169/Inconel 718 nickel alloy bars (15 mm in diameter x 500 mm in length) in accordance with industry standards.
Is Inconel 718 difficult to machine?
This nickel-based superalloy is a common material in the aerospace industry, possessing excellent strength and heat resistance-but these very properties make it extremely difficult to machine. Inconel 718 is prone to rapid work hardening, generating extremely high temperatures at the tool-workpiece interface, thus accelerating tool wear.
1. Chemical composition of GH4169 (wt%)
| Element | Content (%) | Function |
|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | Matrix element; high-temperature stability |
| Chromium (Cr) | 17.0 – 21.0 | Oxidation and corrosion resistance |
| Iron (Fe) | Balance (~18-20) | Fe-Ni-Cr base alloy |
| Niobium (Nb) | 4.75 – 5.50 | Core strengthening element – forms γ″ phase (Ni₃Nb) |
| Molybdenum (Mo) | 2.80 – 3.30 | Solid-solution strengthening; creep resistance |
| Titanium (Ti) | 0.65 – 1.15 | Forms γ′ strengthening phase (Ni₃(Al,Ti)) |
| Aluminum (Al) | 0.20 – 0.80 | Forms γ′ strengthening phase; improves oxidation resistance |
| Carbon (C) | ≤ 0.08 | Low carbon for toughness |
| Manganese (Mn) | ≤ 0.35 | Deoxidizer |
| Silicon (Si) | ≤ 0.35 | Deoxidizer |
| Phosphorus (P) | ≤ 0.015 | Ensures toughness |
| Sulfur (S) | ≤ 0.015 | Ensures hot workability |
| Boron (B) | 0.002 – 0.006 | Grain boundary strengthener |
| Cobalt (Co) | ≤ 1.00 | Residual element |
| Copper (Cu) | ≤ 0.30 | Residual element |
2. High-temperature mechanical properties of GH4169 round bars
| Temp (°C) | Temp (°F) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Strength Retention |
|---|---|---|---|---|---|
| 20 (RT) | 68 | ≥ 1275 | ≥ 1035 | ≥ 12 | 100% |
| 300 | 572 | ~1200 | ~1000 | ~15 | 94% |
| 400 | 752 | ~1180 | ~980 | ~15 | 92% |
| 500 | 932 | ~1150 | ~950 | ~16 | 90% |
| 600 | 1112 | ~1100 | ~900 | ~18 | 86% |
| 650 | 1202 | ~1000 | ~850 | ~20 | 78% |
| 700 | 1292 | ~850 | ~750 | ~22 | 66% |
| 760 | 1400 | ~600 | ~550 | ~25 | 47% |
Click to download the GH4169 alloy PDF file now
3. GH4169 Hot-rolled/Forged Bar Size Specifications
| Diameter Range (mm) | Diameter Range (in) | Length (mm) | Tolerance Grade | Surface Condition |
|---|---|---|---|---|
| 10 – 18 | 0.375 – 0.750 | 2000 – 6000 | h9 – h11 | Black |
| 18 – 30 | 0.750 – 1.200 | 2000 – 6000 | h9 – h11 | Black |
| 30 – 50 | 1.200 – 2.000 | 2000 – 6000 | h9 – h11 | Black |
| 50 – 80 | 2.000 – 3.150 | 2000 – 6000 | h9 – h11 | Black |
| 80 – 100 | 3.150 – 4.000 | 2000 – 6000 | h10 – h11 | Black |
| 100 – 150 | 4.000 – 6.000 | 2000 – 4000 | h10 – h11 | Black |
| 150 – 200 | 6.000 – 8.000 | 2000 – 4000 | h10 – h11 | Black |
| 200 – 300 | 8.000 – 12.000 | 1000 – 3000 | h11 – h12 | Black |
4. GH4169 Cold-drawn/Grinded Bar Stock (Precision)
| Diameter Range (mm) | Diameter Range (in) | Tolerance Grade | Surface Roughness (Ra) | Straightness (mm/m) |
|---|---|---|---|---|
| 3 – 6 | 0.125 – 0.250 | h6 – h8 | ≤ 0.4 µm | ≤ 0.3 |
| 6 – 10 | 0.250 – 0.375 | h6 – h8 | ≤ 0.4 µm | ≤ 0.3 |
| 10 – 18 | 0.375 – 0.750 | h6 – h8 | ≤ 0.8 µm | ≤ 0.3 |
| 18 – 30 | 0.750 – 1.200 | h6 – h8 | ≤ 0.8 µm | ≤ 0.3 |
| 30 – 50 | 1.200 – 2.000 | h6 – h8 | ≤ 1.6 µm | ≤ 0.5 |
| 50 – 80 | 2.000 – 3.150 | h6 – h8 | ≤ 1.6 µm | ≤ 0.5 |
| 80 – 100 | 3.150 – 4.000 | h7 – h9 | ≤ 1.6 µm | ≤ 0.5 |
Contact us to customize GH4169 products to fit your project dimensions
5. Overview and Main Properties of GH4169 Bar Stock
GH4169 is the Chinese version of Inconel 718, a precipitation-hardening nickel-chromium-molybdenum alloy designed to achieve high strength and corrosion resistance over a temperature range from low temperatures to 700°C (1290°F).
Dimensions: Diameter 15mm, Length 500mm.
Composition: High nickel content (approximately 50-55%), high chromium and molybdenum content.
Main Properties: Excellent tensile strength, creep rupture strength, and fatigue strength.
Corrosion Resistance: Excellent performance in highly corrosive environments, including acidic gases and seawater.
Properties: Non-magnetic, retains oxidation resistance at temperatures up to 980°C.
6. GH4169 Bar Procurement Guide (15*500mm)
To ensure quality, please verify the following before purchasing:
✅️Material Certification: Ensure the bar comes with a Factory Test Report (MTR) to guarantee its chemical composition and mechanical properties.
✅️Heat Number Traceability: The bar should be marked with a heat number and linked to the test report.
✅️Condition: Please specify whether you require solution-treated (softer) or age-hardened (maximum strength/hardness).
✅️Dimensional Tolerances: Verify that the dimensional tolerances for the 15mm diameter and 500mm length meet the requirements.
7. Typical Applications of GH4169 Round Bars
Aerospace: Gas turbine engines, high-speed aircraft fuselage components, and engine assemblies.
Energy and Oil & Gas: Nuclear reactors, downhole components, and oilfield equipment.
Chemical Processing: Corrosion-resistant components.
Why Choose Gnee Alloy?
✅️Wholesale Pricing: Sourcing directly from the manufacturer can save you up to 20%.
✅️Small Order Support: We support innovation and offer minimum order quantities as low as 1 piece for lab validation and prototyping.
✅️Global Fast Shipping: Optimized logistics minimize delivery times to international aerospace hubs.
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: Will your h9 tolerance rods work in a Star or Citizen Swiss lathe?
A: Yes. Our rods are specifically centerless ground to meet the exacting requirements of Swiss-type automatic lathes, ensuring zero vibration and zero bar-feeder interference.
Q2: Is GH4169 harder to machine than Inconel 625?
A: Yes, due to its precipitation-hardening phases. However, our optimized solution-annealed state makes it the most Cost-effective Solution for machining high-strength fasteners compared to standard 718.
Q3: Can you provide the bars in the "Fully Aged" state?
A: Yes. For parts where you cannot perform heat treatment after machining, we supply AMS 5663 Aged Bars (36-44 HRC), ground to precision tolerances.
Q4: Do you offer trial samples for thread rolling tests?
A: Absolutely. We encourage material validation. Contact us today to Order GH4169 Precision Rod Samples specifically for your thread-forming or cold-heading evaluation.
