In fields such as aerospace sensors, medical instruments, and high-pressure fuel injectors, even the smallest defect can lead to catastrophic failure. Key pain points for customers sourcing high-performance capillaries include:
Internal oxidation (scaling): Standard annealing processes leave black residue inside the microtubes that can flake off and clog sensitive orifices.
Tolerance drift: Inconsistent wall thickness can cause unstable pressure readings and assembly problems.
Material purity: Non-metallic inclusions in "commercial-grade" alloys can cause the tubes to crack during precision bending or flaring.
At Gnee Alloy, we eliminate these risks. Our specialized factory uses multi-stage cold drawing and vacuum bright annealing processes to ensure capillaries are flawless inside and out.
Click to inquire about our GH4169 precision capillary tubes and check inventory
Manufacturer of GH4169 and GH3128 alloy precision tubing
Manufacturer of GH4169 and GH3128 alloy precision tubing
GH4169 and GH3128 alloy precision tubing are high-performance nickel-based superalloy tubing designed for extreme environments and commonly used in aerospace, power generation, and advanced industrial applications. They are available in a variety of sizes, from small capillaries to large pipes, and are renowned for their superior heat resistance, oxidation resistance, and corrosion resistance.
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. Comparison of chemical composition (weight percentage) of GH4169 and GH3128 alloy precision tubing
| Element | GH4169 (Inconel 718) | GH3128 | Key Difference |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | Balance (≥ 60.0) | GH3128 has higher Ni content |
| Chromium (Cr) | 17.0 – 21.0 | 19.0 – 22.0 | GH3128 slightly higher |
| Iron (Fe) | Balance (~18-20) | ≤ 1.5 | GH4169 has much higher Fe |
| Molybdenum (Mo) | 2.80 – 3.30 | 7.5 – 9.0 | GH3128 has ~2.5x more Mo |
| Tungsten (W) | – | 7.5 – 9.0 | GH3128 unique |
| Niobium (Nb) | 4.75 – 5.50 | – | GH4169 unique – γ″ former |
| Titanium (Ti) | 0.65 – 1.15 | 0.15 – 0.35 | GH4169 higher |
| Aluminum (Al) | 0.20 – 0.80 | 0.10 – 0.50 | GH4169 higher |
| Carbon (C) | ≤ 0.08 | ≤ 0.05 | GH3128 lower |
| Manganese (Mn) | ≤ 0.35 | ≤ 0.50 | Similar |
| Silicon (Si) | ≤ 0.35 | ≤ 0.80 | GH4169 lower |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.013 | Similar |
| Sulfur (S) | ≤ 0.015 | ≤ 0.013 | Similar |
| Boron (B) | 0.002 – 0.006 | ≤ 0.012 | GH3128 may have more B |
| Cerium (Ce) | – | ≤ 0.050 | GH3128 unique |
| Cobalt (Co) | ≤ 1.00 | – | – |
Click to download the GH4169 alloy PDF file now
Key Information on GH4169 and GH3128 Alloy Precision Tubing
GH4169 Precision Tubing
GH4169 is a precipitation-strengthened nickel-based superalloy (similar to Inconel 718) with excellent overall performance at temperatures up to 700°C (1300°F).
Composition: Primarily composed of nickel (Ni), chromium (Cr), iron (Fe), niobium (Nb), and molybdenum (Mo).
Key Properties: High tensile strength, fatigue resistance, and excellent high-temperature creep resistance.
Applications: Suitable for aircraft engine components, gas turbines, and high-stress components in the oil and gas industry.
GH3128 Precision Tubing
GH3128 is a solid solution-strengthened nickel-based superalloy designed for superior durability in corrosive, high-temperature environments.
Key Properties: Excellent oxidation resistance, high structural stability, and good ductility at temperatures above 1000°C.
Applications: Commonly used in combustion chambers, afterburners, and other aerospace or industrial furnace components.
4. GH4169 tubes exhibit exceptional dimensional accuracy: ±0.01mm reference
| Parameter | Manufacturing Capability | Industrial Benefit |
| Outer Diameter (OD) | 0.5 mm to 10.0 mm | Ultra-fine for micro-fluidics. |
| Wall Thickness (WT) | 0.05 mm to 2.0 mm | Specialized thin-wall capability. |
| Tolerance Range | Up to ± 0.01 mm | Perfect for interference fits. |
| Surface Finish | Bright Annealed (BA) | Mirror-like Ra ≤ 0.4μm finish. |
| ID Cleanliness | Scale-Free / Mirror Bright | Protects sensitive sensors. |
5. Physical properties of GH4169 and GH3128 tubes
| Property | GH4169 | GH3128 |
|---|---|---|
| Density | 8.19 g/cm³ | 8.84 g/cm³ |
| Melting Range | 1260 – 1336°C | 1340 – 1390°C |
| Thermal Conductivity (20°C) | 11.4 W/m·K | 12.5 W/m·K |
| Coefficient of Thermal Expansion (20-100°C) | 13.0 × 10⁻⁶/°C | 11.8 × 10⁻⁶/°C |
| Coefficient of Thermal Expansion (20-800°C) | ~15.5 × 10⁻⁶/°C | ~16.5 × 10⁻⁶/°C |
| Specific Heat (20°C) | 435 J/kg·K | 450 J/kg·K |
| Modulus of Elasticity (20°C) | ~200 GPa | ~210 GPa |
| Magnetic Properties | Slightly magnetic | Non-magnetic |
6. GH4169 and GH3128 Tube Selection Recommendations
Criteria for Selecting GH4169:
Highest strength (especially yield strength) is a primary requirement.
Operating temperatures up to 650-700°C, and subjected to significant mechanical loads.
Creep resistance at 600-650°C is crucial.
Applications involve high pressure and load-bearing components.
Component geometry is relatively simple (due to limited formability).
Post-weld heat treatment is acceptable.
Weight is a consideration (GH4169 is lighter).
Criteria for Selecting GH3128:
Operating temperatures between 800°C and 950°C.
High ductility and formability are required (complex shapes, mass production).
Excellent thermal fatigue resistance is required.
Applications include combustion chambers, transition pipes, flame stabilizers, and exhaust systems.
Welding is required, and post-weld heat treatment is not necessary.
Non-magnetic properties are required. Slightly lower strength but higher temperature resistance is acceptable.
Contact our professionals to recommend the right alloy for your project
7. Decision Matrix for Selecting GH4169 and GH3128 Alloys
| Requirement Priority | Recommended Alloy |
|---|---|
| Highest strength (RT to 650°C) | GH4169 |
| Yield strength > 1000 MPa | GH4169 |
| Service temperature 800-950°C | GH3128 |
| Maximum ductility and formability | GH3128 |
| Thermal fatigue resistance | GH3128 |
| Creep resistance at 650°C | GH4169 |
| No post-weld heat treatment | GH3128 |
| Non-magnetic requirement | GH3128 |
| Weight reduction | GH4169 |
| High-pressure / high strength | GH4169 |
Why choose to source GH4169 from Gnee Alloy factory?
✅️Direct Factory Price: Eliminate middleman markups and secure the best wholesale rates for high-precision alloys.
✅️Small Order Support: We maintain an inventory of standard sizes for immediate dispatch, supporting your R&D and prototype phases.
✅️Full Traceability: Every order comes with an MTC 3.1 Mill Test Certificate documenting chemical purity and mechanical verification.
✅️Global Fast Shipping: Optimized logistics for secure delivery of high-value micro-precision tubes to Russia, Europe, and Asia.
Gnee Steel GH4169 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 Steel GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Can your GH4169 capillary tubes handle 1000 bar pressure?
A: Yes. Depending on the OD/WT ratio, our high-strength GH4169 seamless tubes are High-Pressure Rated for the most demanding hydraulic and common-rail fuel systems.
Q2: Is the internal surface guaranteed to be free of debris?
A: Absolutely. Our Bright Annealed (BA) finish ensures a mirror-bright internal surface with zero oxidation scale. This is critical for fuel injectors where debris can cause permanent system failure.
Q3: Can you produce custom lengths for heat-sensor probes?
A: Yes. We offer precision Cut-to-Length services with deburred ends, ensuring the tubes are ready for immediate welding or assembly.
Q4: Do you offer trial orders for non-standard wall thicknesses?
A: We support aerospace and medical innovation by offering Flexible MOQs for specialized thin-wall or non-standard dimension prototype runs.
