In the heavy energy, gas turbine, and aerospace sectors, the supply of large-diameter GH4169 (equivalent to Inconel 718/UNS N07718) round bars is a logistical bottleneck. For purchasing managers, a common pain point in the industry is the "forging queue"-most manufacturers require 12-16 weeks of lead time for products exceeding 150 mm in diameter.
Consequences of delayed delivery:
Production stoppages and cost overruns: Emergency furnace or turbine maintenance may be forced to halt due to material shortages.
Budget fluctuations: Material prices can fluctuate dramatically during production wait periods of up to 3 months.
Substitution risk: Lower-grade materials may be required to maintain production schedules.
At Gnee Alloy, we eliminate the hassle of waiting. We maintain a large wholesale inventory of heavy-duty forged bars, ready to ship immediately.
Click to get a GH4169 product quote
ASME SB637 GH4169 165mm Outer Diameter Round Bars
ASME SB637 GH4169 165mm Outer Diameter Round Bars
ASME SB637 GH4169 (also known as Inconel 718 or UNS N07718) is a precipitation-hardening nickel-chromium-iron alloy specifically designed for high-strength, high-temperature, and corrosion-resistant applications. Round bars of this specification with a diameter of 165 mm are commonly used in demanding industries such as aerospace, oil and gas, and energy production.
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718).
1. 165mm Diameter GH4169 Bar Specifications
| Specification | Details |
|---|---|
| Standard | ASME SB637 (Precipitation Hardening Nickel Alloy Bar Standard) |
| Material Grade | GH4169 / UNS N07718 / W.Nr. 2.4668 (Inconel 718) |
| Diameter | 165 mm (approx. 6.5 inches) |
| Processing | Typically supplied in hot forging, annealed or solution-treated and aged (AMS 5662, AMS 5663 or AMS 5664) |
| Surface Finishes | Black, peeled, polished, or bright finishes |
| Length | Typically produced in random lengths (3 – 6 meters), or cut to required dimensions upon request |
2. Chemical composition of GH4169 Bar (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 |
3. Mechanical properties of GH4169 165mm diameter bars
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength, Ultimate | ≥ 1200 MPa (174 ksi) | ASTM E8 / AMS 2370 |
| Tensile Strength, Yield (0.2% Offset) | ≥ 965 MPa (140 ksi) | ASTM E8 / AMS 2370 |
| Elongation at Break (4D) | ≥ 12% | ASTM E8 / AMS 2370 |
| Reduction of Area | ≥ 12% | ASTM E8 |
| Hardness (Rockwell C) | 32 – 38 HRC | ASTM E18 |
| Modulus of Elasticity | ~200 GPa (29.0 × 10⁶ psi) | ASTM E111 |
| Poisson's Ratio | 0.29 – 0.30 | – |
| Impact Toughness (Charpy V-notch, RT) | ≥ 20 J | ASTM E23 |
Click to download the GH4169 alloy PDF file now
4. GH4169 Non-destructive Testing (NDT) Requirements for Bars
| Test Method | Requirement | Standard | Acceptance Criteria |
|---|---|---|---|
| Ultrasonic Testing (UT) | 100% | ASTM E2375 / AMS 2370 | No defects exceeding 0.8mm |
| Eddy Current Testing (ET) | As specified (surface) | ASTM E426 | No relevant indications |
| Visual Inspection | 100% | ASTM E543 | No surface defects |
5. Common Applications of GH4169 Rods
Aerospace: Jet engine components, casings, fasteners, and turbine assemblies.
Oil & Gas: Downhole tools, pump shafts, valves, and high-pressure components (typically conforming to NACE MR0175 standards).
Power Generation: Nuclear fuel elements and turbine assemblies.
Why choose to purchase GH4169 from Gnee Alloy?
✅️Direct Factory Price: Skip the international trading agents and secure the best wholesale rates for bulk energy projects.
✅️ASME SB637 Compliance: Our material is specifically certified for use in high-pressure vessels and energy infrastructure.
✅️Zero Centerline Porosity: Through a high forging reduction ratio (≥ 4:1), we ensure a 100% dense core for critical shafts and discs.
✅️Global Logistics: We provide specialized export packaging for high-value heavy rods and rapid delivery to 50+ countries.
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: How do you guarantee the internal integrity of a 300mm bar?
A: Every meter of our large forged rods undergoes 100% Ultrasonic Testing (UT) according to AMS 2154 Class A. The VIM+VAR process ensures there are no internal "freckles" or macro-segregation even at the core of the 300mm rod.
Q2: Can I get a single 165mm rod, or is there a high MOQ?
A: As part of our Wholesale Supply model, we support maintenance and R&D. For all in-stock items, our MOQ is just 1 piece.
Q3: Is your GH4169 interchangeble with Alloy 718 on an ASME blueprint?
A: Yes. GH4169 is the technische equivalent to UNS N07718. Our material complies with ASME SB637 and ASTM B637, ensuring it meets the most rigorous industrial safety codes.
Q4: Do you offer bulk discounts for petrochemical refinery overhauls?
A: Absolutely. We provide attractive tiered pricing for large-scale energy infrastructure projects and long-term MRO supply contracts worldwide.
