For purchasing managers and CNC machine shop owners, sourcing high-quality GH4169 (Inconel 718 equivalent) round bars is often a gamble. Key pain points include:
Delivery delays: Standard rolling mills typically require 12-16 weeks to deliver large-diameter forged bars, which can delay critical aerospace or energy projects.
Feeding issues: Small-diameter bars with poor tolerances (below h11) are prone to jamming on automatic feeders and Swiss-type lathes, leading to tool damage and downtime.
Internal defects: Centerline porosity and "freckles" (macro-segregation) in large-diameter bars often only become apparent after costly machining has begun.
At Gnee Alloy, we eliminate these risks. As a Tier 1 wholesale supplier, we maintain a large inventory of high-performance GH4169 bars in both black and bright finishes, ready for immediate shipment.
Click to view the GH4169 bar stock inventory list and size chart
GH4169 UNS N07718 High-Temperature Alloy Black Gloss Surface Round Bar
GH4169 UNS N07718 High-Temperature Alloy Black Gloss Surface Round Bar
GH4169 (UNS N07718) is a nickel-chromium-iron-based precipitation-hardening superalloy, renowned for its excellent strength, corrosion resistance, and creep rupture resistance up to 700°C (1300°F). The black, smooth round bars are commonly used in components for aerospace engines, gas turbines, and the oil/gas industry.
What are the properties of UNS N07718 material?
Inconel Alloy 718 (UNS number N07718) is one of the most commonly used nickel-based superalloys. These alloys are characterized by high strength, excellent high-temperature resistance, corrosion resistance, and oxidation resistance. IN718 is specifically designed to maintain fatigue and creep resistance at temperatures up to 700°C.
1. GH4169 Round Bar Range and Applicable Standards
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | Round Bar – Black (Hot Rolled / Forged) & Bright (Cold Drawn / Ground / Peeled) |
| Surface Conditions | Black (as-rolled/forged, scale present) / Bright (oxide-free, smooth finish) |
| Applicable Standards | AMS 5662, AMS 5663, ASTM B637, GB/T 14997, GB/T 14998 |
2. Chemical composition (wt%) of GH4169 round bars
| Element | Content (%) | Standard 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) for high-temperature strength |
| 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; improves oxidation resistance |
| 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) | ≤ 0.015 | ≤ 0.015 | Ensures toughness |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | Ensures hot workability |
| Boron (B) | 0.002 – 0.006 | 0.002 – 0.006 | Grain boundary strengthener; critical for creep life |
| 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 Bar Surface Finish
We understand that different manufacturing processes require different surface qualities. Our GH4169 bars are produced using Vacuum Ion Melting (VIM) + Vacuum Argon Arc Welding (VAR) processes to ensure absolute structural integrity.
A. Bright Surface: Precision Grinded Bars
Process: Centerless grinding for maximum precision.
Precision: Guaranteed h8, h9, h10, and h11 tolerances.
Surface Finish: Ra ≤ 0.4μm (mirror polishing), ensuring a smooth, zero-oxidation surface.
Optimal Applications: Automated feeders, CNC Swiss-type machine tools, aerospace fasteners, and high-precision sensors.
B. Black Surface: Hot-Forged Rolled Bars
Process: High compression ratio (≥ 4:1) hot-rolled or hot-forged.
Sizes: Diameters up to 400mm (15.7 inches).
Integrity: 100% ultrasonically tested (UT A/AAA grade), ensuring zero porosity along the centerline.
Best suited for: secondary forging, large turbine discs, engine shafts, and heavy-duty structural rings.
4. GH4169 seamless tube technical specifications and tolerance matrix
| Property | Value / Specification | Commercial Advantage |
| Tolerance Range | h8 - h11 | Zero-jam feeding in automated lines. |
| Diameter Range | 2.0 mm to 400.0 mm | Wholesale Inventory for all projects. |
| Straightness | ≤ 0.5 mm / meter | Prevents high-speed CNC vibration. |
| Tensile Strength | ≥ 1240 MPa (Fully Aged) | Elite high-temp load capacity. |
| Compliance | AMS 5662, ASTM B637 | Certified Aerospace Grade quality. |
5. Why choose to source GH4169 from Gnee Alloy's wholesale inventory?
✅️Immediate Availability: We stock over 200 tons of GH4169 rods, reducing your lead time from months to days.
✅️Direct Factory Price: Skip the international trading agents and secure original manufacturer rates.
✅️MTC 3.1 Traceability: Full EN 10204 compliance documenting chemical heat analysis and mechanical verification.
✅️Global Fast Shipping: Optimized logistics to USA, Europe, UAE, and Southeast Asia within 5-7 business days.
Gnee Steel GH4169(inconel 718) Certificate
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Is GH4169 interchangeable with Inconel 718 for aerospace fasteners?
A: Yes. GH4169 is the technical equivalent of Inconel 718 (UNS N07718). Our rods are manufactured to meet AMS 5662 and AMS 5663 standards, making them globally interchangeable for flight-safety parts.
Q2: Do you offer "Cut-to-Length" services for large forged blocks?
A: Absolutely. We offer precision bandsaw cutting to provide ready-to-machine blanks, saving you material waste and extra labor on your shop floor.
Q3: How do you guarantee the internal integrity of a 300mm diameter forged rod?
A: Every large bar undergoes 100% Ultrasonic Testing (UT) to AMS 2154 Class A. We only use VIM+VAR double-melted ingots to prevent "freckles" and macro-segregation in the core.
Q4: Do you support small trial orders for R&D?
A: Yes. As a Tier-1 Supplier, we support innovation. We offer a 1pc MOQ for all standard diameters currently in our wholesale inventory.
