High-precision Bright Annealed (BA) GH4169 / 718 Tubing
Gnee Steel is a professional supplier of bright annealed (BA) GH4169 tubing, providing products with mirror-like finish and oxygen-free purity for high-end fluid systems.
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
- Send E-mail: ss@gneesteel.com
- Tel: +8615824687445
Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of high-precision bright annealed (ba) gh4169 / 718 tubing in China. If you're going to wholesale high quality high-precision bright annealed (ba) gh4169 / 718 tubing made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
Our Bright Annealed (BA) GH4169/718 tubing is the preferred choice for industries with extremely high cleanliness and precision requirements. Unlike standard tubing that requires acid pickling, our BA tubing undergoes heat treatment in a 100% controlled hydrogen atmosphere.
This advanced process prevents oxidation during annealing, resulting in a mirror-like finish (Ra < 0.4μm) on both the inner and outer diameters of the tubing. The final product is ultra-clean, scale-free tubing, eliminating the risk of particulate contamination in sensitive aerospace fuel lines or semiconductor gas delivery systems.
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GNEE GH4169 BA
Pipe introduce
High-precision bright annealed (BA) GH4169 (Inconel 718) tubing is a nickel-based superalloy designed for demanding applications requiring high strength and high temperatures. Also known as UNS N07718 or Werkstoff Nr. 2.4668, this material undergoes special processing to achieve a high-quality surface finish and tight dimensional tolerances, making it suitable for industries such as aerospace, oil and gas, and medical equipment.
precision GH4169 Tube Description
| Feature | Details |
| Material Grade | GH4169 / Inconel 718 / UNS N07718 |
| Surface Finish (Ra) | ≤ 0.4μm (Internal & External) |
| Heat Treatment | Bright Annealing (BA) in Hydrogen Atmosphere |
| Dimensional Tolerance | Up to ±0.03mm - ±0.05mm |
| Outer Diameter (OD) | 1mm – 38mm (Specializing in Small Diameter) |
| Wall Thickness (WT) | 0.1mm – 3.0mm |
| Cleanliness | ASTM G93 Level C / Semi Grade compliant |
GNEE bright annealed GH4169 Tube Specification Sheet
Chemical composition (wt%) of GH4169 precision tube
| Element | Content (%) | Standard Requirement | Notes |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 50.0 – 55.0 | Matrix element; provides high-temperature stability |
| 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 | Primary γ″ strengthening element |
| Molybdenum (Mo) | 2.80 – 3.30 | 2.80 – 3.30 | Solid-solution strengthening |
| Titanium (Ti) | 0.65 – 1.15 | 0.65 – 1.15 | Forms γ′ strengthening phase |
| Aluminum (Al) | 0.20 – 0.80 | 0.20 – 0.80 | Forms γ′ strengthening phase |
| Carbon (C) | ≤ 0.08 | ≤ 0.08 | Low carbon for weldability |
| 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 |
| Cobalt (Co) | ≤ 1.00 | ≤ 1.00 | Residual element |
| Copper (Cu) | ≤ 0.30 | ≤ 0.30 | Residual element |
Physical properties of precision GH4169 pipe
| Property | Value | |
|---|---|---|
| Density | 8.19 g/cm³ | |
| Melting Range | 1260 – 1336°C | |
| Thermal Conductivity (20°C) | 11.4 W/m·K | |
| Thermal Conductivity (500°C) | ~16.0 W/m·K | |
| Coefficient of Thermal Expansion (20-100°C) | 13.0 × 10⁻⁶/°C | |
| Coefficient of Thermal Expansion (20-600°C) | ~14.5 × 10⁻⁶/°C | |
| Specific Heat (20°C) | 435 J/kg·K | |
| Specific Heat (600°C) | ~500 J/kg·K | |
| Modulus of Elasticity (20°C) | ~200 GPa (29.0 × 10⁶ psi) | |
| Modulus of Elasticity (600°C) | ~175 GPa (25.4 × 10⁶ psi) | |
| Poisson's Ratio | 0.29 – 0.30 | |
| Electrical Resistivity | 1.25 µΩ·m | |
| Magnetic Permeability | 1.005 (slightly magnetic) |
Click to download the GH4169 alloy PDF file now
GH4169 Precision Tube Dimensions and Specifications
| OD (mm) | OD (in) | Wall Thickness (mm) | Wall Thickness (in) | Typical Application |
|---|---|---|---|---|
| 3.18 | 0.125 | 0.51 | 0.020 | Instrumentation lines |
| 4.76 | 0.188 | 0.71 | 0.028 | Control lines |
| 6.35 | 0.250 | 0.89 | 0.035 | Fuel system lines |
| 9.53 | 0.375 | 1.07 | 0.042 | Bleed air ducts |
| 12.70 | 0.500 | 1.24 | 0.049 | High-pressure hydraulic |
| 15.88 | 0.625 | 1.65 | 0.065 | Structural lines |
Contact us to customize GH4169 products to fit your project dimensions
Main Applications of GH4169 Alloy Tubes
Semiconductor Industry: High-purity gas delivery systems and chemical distribution lines.
Aerospace and Defense: Precision fuel manifolds, nozzles, and hydraulic sensing lines.
Instrumentation: Pressure sensors and capillary tubes for chromatographs.
Nuclear and Laboratory Equipment: High-pressure sampling tubing for corrosive environments.
GH4169 Non-destructive Testing (NDT) Requirements for Precision Tubes
Gnee Alloy as a trusted supplier, Gnee Steel adheres to a "zero-defect" principle. Every GH4169 seamless pipe undergoes a rigorous inspection process before shipment.
| Test Method | Requirement | Standard |
|---|---|---|
| Eddy Current Testing (ET) | 100% | ASTM E426 |
| Ultrasonic Testing (UT) | As specified / typically required for aviation | ASTM E213 |
| Hydrostatic Test | 100% | ASME Section VIII |
| Pneumatic Test | As specified (clean systems) | – |
| Visual Inspection | 100% (10-30x magnification) | ASTM E543 |
| Borescope Inspection | 100% (for small diameter tubes) | – |
GNEE Group GH4169 superalloy Packaging
GNEE Group GH4169 superalloy Packaging
Contact us to choose your preferred packaging and shipping method
Why Choose Gnee Steel's GH4169 BA Tubing?
✅️Ultra-Clean Surface (Oxidation-Free): Hydrogen-protected annealing ensures zero oxidation or scaling. The tubing is ready for cleanroom applications upon delivery.
✅️Micro-Tolerances: We strictly control dimensions to within ±0.05mm tolerances, ensuring a perfect fit in high-pressure joints and rail welding.
✅️Enhanced Corrosion Resistance: The smooth, mirror-finish surface significantly reduces the effective surface area, preventing contaminant buildup and minimizing the risk of pitting corrosion.
✅️Superior Mechanical Properties: While achieving high surface quality, the tubing retains all the high-temperature strength and fatigue resistance of the GH4169 (Inconel 718) high-temperature alloy.
GH4169 certificate
Click to view our professional certificates for GH4169 alloy
FAQ
Q: Can you provide BA tubes for semiconductor or cleanroom applications?
A: Yes, our BA GH4169 tubes are widely used in high-purity gas delivery. We provide additional ultra-sonic cleaning and specialized packaging to meet cleanroom standards.
Q: Does Bright Annealing affect the strength of Inconel 718?
A: Not at all. Bright Annealing is a thermal process that optimizes the grain structure for better ductility and surface finish while maintaining the alloy's core high-temperature mechanical properties.
Q: What is the maximum length for your high-precision BA tubes?
A: We provide straight lengths up to 6 meters, but for small diameter tubes, we can also supply them in seamless coils to minimize joints in long-distance fluid lines.
Q: How do you protect the surface during shipping?
A: Each BA tube is individually sleeved in plastic and packed in reinforced wooden crates or hard tubes to prevent any surface scratches or contamination during transit.
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