Hot-forged GH4169 high-temperature round bar: 100% ultrasonic flaw detection
Gnee Alloy
Hot-forged GH4169 high-temperature environment round bar: 100% ultrasonic flaw detection
Hot-forged GH4169 (equivalent to UNS N07718/Inconel 718) round bars used in high-temperature environments typically undergo rigorous 100% ultrasonic testing to ensure their structural integrity. This high-temperature alloy is commonly used in aerospace applications (e.g., turbine disks), and due to its high sensitivity to hot-working temperatures of 900–1120°C, it requires inspection to identify potential internal defects such as voids or inclusions.
Gnee Alloy
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 (weight percentage).
1. Overview of GH4169 round bar material
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | High Temperature Round Bar (Hot Rolled / Forged / Cold Drawn) |
| Material Type | Wrought Nickel-based Superalloy |
| Strengthening Mechanism | γ″ + γ′ precipitation hardening |
| Applicable Standards | AMS 5662, AMS 5663, ASTM B637, GB/T 14994, GB/T 14997, GB/T 14998 |
| Typical Applications | Turbine discs, compressor blades, high-strength fasteners, high-temperature shafts, gas turbine components |
| Maximum Service Temperature (Load-Bearing) | 650 – 700°C |
2. Chemical composition of GH4169 round bars (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; improves stress rupture life |
| Cobalt (Co) | ≤ 1.00 | Residual element |
| Copper (Cu) | ≤ 0.30 | Residual element |
Click to download the GH4169 alloy PDF file now
3. GH4169 Hot-rolled round bar Dimensional Specifications
| Diameter Range (mm) | Diameter Range (in) | Length (mm) | Tolerance Grade | Surface Condition |
|---|---|---|---|---|
| 10 – 18 | 0.375 – 0.750 | 2000 – 6000 | h9 – h10 | Black |
| 18 – 30 | 0.750 – 1.200 | 2000 – 6000 | h9 – h10 | Black |
| 30 – 50 | 1.200 – 2.000 | 2000 – 6000 | h9 – h10 | Black |
| 50 – 80 | 2.000 – 3.150 | 2000 – 6000 | h9 – h10 | 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 |
4. Mechanical properties (aging condition) of GH4169 hot-rolled round steel according to diameter
| Diameter Range (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|
| ≤ 25 | ≥ 1275 | ≥ 1035 | ≥ 15 | ≥ 20 |
| 25 – 50 | ≥ 1275 | ≥ 1035 | ≥ 14 | ≥ 18 |
| 50 – 75 | ≥ 1240 | ≥ 1000 | ≥ 12 | ≥ 15 |
| 75 – 100 | ≥ 1200 | ≥ 965 | ≥ 12 | ≥ 12 |
| 100 – 150 | ≥ 1175 | ≥ 930 | ≥ 10 | ≥ 10 |
| 150 – 200 | ≥ 1150 | ≥ 900 | ≥ 10 | ≥ 10 |
| 200 – 300 | ≥ 1100 | ≥ 860 | ≥ 8 | ≥ 8 |
Contact us to customize GH4169 products to fit your project dimensions
5. Quality testing of GH4169 hot-rolled round steel
As a Reliable Supplier, we provide the data necessary to pass the most rigorous aerospace and nuclear quality audits:
✅️100% Ultrasonic Testing (UT): Every forged rod is tested to AMS 2154 Class A standards. We guarantee zero linear or point defects in the core.
✅️Grain Size Control: We guarantee ASTM E112 Level 8 or finer, maximizing the High-Cycle Fatigue (HCF) life of your shafts.
✅️MTC 3.1 & 3.2 Traceability: Full heat-analysis and stress-rupture testing reports included with every shipment.
GH4169 100% Ultrasonic Testing (UT)
6. GH4169 Round Bar Applications
Our GH4169 is the preferred choice for the following fields:
Aerospace Propulsion Systems: Main engine shafts, compressor discs, and structural rings.
Oil & Gas: Large-diameter downhole tool fittings and wellhead components conforming to NACE MR0175 standards.
Nuclear Engineering: High-strength reactor internals and fuel element supports.
Power Generation: Rotor bolts and shafts for land-based gas turbines.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
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 core of a 400mm bar has the same strength as the surface?
A: Through a high reduction ratio and VIM+VAR melting. The dual-vacuum process ensures chemical homogeneity, while our forging process ensures full recrystallization throughout the entire diameter, preventing the "soft core" issue.
Q2: Is GH4169 interchangeable with Inconel 718 for turbine shafts?
A: Yes. GH4169 is the technical equivalent used in global blueprints for UNS N07718. Our materials are manufactured to be globally interchangeable and meet all AMS/ASTM requirements.
Q3: Can you provide "Near-Net Shape" forgings to reduce my machining time?
A: Absolutely. We offer Custom Fabrication, providing forged-to-shape discs and stepped shafts, saving you up to 30% on material costs and machining labor.
