For purchasing managers and engineers involved in European or international high-pressure projects, the biggest pain point lies in complying with the EU PED 2014/68/EU regulation. Without PED-certified material suppliers, your pressure equipment will fail safety audits, leading to significant project delays or even legal rejection.
Furthermore, heat exchanger tubes are among the most vulnerable components in a thermal system. Failure of standard alloy tubes is typically caused by:
Local pitting: Caused by impurities in the metal matrix.
Thermal fatigue: Cracks that develop during rapid heating and cooling cycles.
Pressure leakage: Micropores in the tube wall that are undetectable by standard tests.
At Gnee Steel, we eliminate these risks. As a PED-certified manufacturer, Gnee Steel offers GH4169 (equivalent to Inconel 718) tubing, designed for zero leakage and absolute industrial durability.
Request a quote for PED-certified GH4169 heat exchanger tubing and compliance documentation
PED-Certified GH4169 Heat Exchanger Tube Manufacturer
PED-Certified GH4169 Heat Exchanger Tube Manufacturer
PED-certified GH4169 (also known as Inconel 718 or UNS N07718) heat exchanger tubes are high-performance nickel-based superalloy components designed for extreme environments, offering high strength and high-temperature resistance. These tubes are commonly used in projects compliant with the PED (Pressure Equipment Directive 2014/68/EU) and are suitable for high-pressure, high-temperature applications in industries such as chemical, oil and gas, and power generation.
What is GH4169 equivalent to?
Inconel 718
GH4169 (equivalent to the American brand Inconel 718) is a precipitation-hardened nickel-based superalloy, widely used in the aerospace industry because of its excellent mechanical properties (Lu et al., 2014).
1. GH4169 Heat Exchanger Tube Scope and Applicable Standards
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | Seamless Heat Exchanger Tube |
| Applicable Standards | ASTM B983 (Nickel Alloy Seamless Tube) ASME SB983 GB/T 14994 AMS 5589 (Aerospace Grade) |
| Typical Applications | Heat exchangers, condensers, evaporators, cooling coils in high-temperature and high-pressure service |
2. Chemical composition (weight percentage) of GH4169 heat exchanger tubes
| Element | Content (%) | Standard Requirement | Function |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 50.0 – 55.0 | Matrix; provides corrosion resistance and high-temperature stability |
| Chromium (Cr) | 17.0 – 21.0 | 17.0 – 21.0 | Oxidation and corrosion resistance |
| Iron (Fe) | Balance (~18-20) | Balance | Base element; Fe-Ni-Cr alloy system |
| Niobium (Nb) | 4.75 – 5.50 | 4.75 – 5.50 | Primary strengthening element – forms γ″ phase (Ni₃Nb) |
| Molybdenum (Mo) | 2.80 – 3.30 | 2.80 – 3.30 | Solid-solution strengthening; enhances 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 |
| Carbon (C) | ≤ 0.08 | ≤ 0.08 | Low carbon for weldability and corrosion resistance |
| Manganese (Mn) | ≤ 0.35 | ≤ 0.35 | Deoxidizer |
| Silicon (Si) | ≤ 0.35 | ≤ 0.35 | Deoxidizer |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.015 | Low for toughness |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | Low for 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 |
Click to download the GH4169 alloy PDF file now
3. Physical properties of GH4169 heat exchanger tubes
| Property | Value | Significance |
|---|---|---|
| Density | 8.19 g/cm³ | Weight calculation |
| Melting Range | 1260 – 1336°C | Thermal stability |
| Thermal Conductivity (20°C) | 11.4 W/m·K | Heat transfer efficiency |
| Thermal Conductivity (500°C) | ~16.0 W/m·K | Heat transfer at operating temp |
| Coefficient of Thermal Expansion (20-100°C) | 13.0 × 10⁻⁶/°C | Thermal stress calculation |
| Coefficient of Thermal Expansion (20-600°C) | ~14.5 × 10⁻⁶/°C | Thermal stress at operating temp |
| Specific Heat (20°C) | 435 J/kg·K | Thermal capacity |
| Specific Heat (600°C) | ~500 J/kg·K | Thermal capacity at operating temp |
| Electrical Resistivity | 1.25 µΩ·m | – |
| Modulus of Elasticity | ~200 GPa | Stiffness |
| Magnetic Properties | Slightly magnetic | Not suitable for magnetic-sensitive applications |
4. GH4169 heat exchanger tube test
In the field of high-pressure heat exchangers, a "good enough" testing method simply won't work. We use industry-leading testing equipment to ensure that every tube is robust and durable, making them veritable precision instruments.
| Inspection Method | Industrial Purpose | Quality Standard |
| Hydrostatic Testing | Verified integrity under extreme internal pressure. | 100% Compliance |
| Eddy Current (ET) | Scans for surface and sub-surface longitudinal defects. | ASTM E426 / PED Req. |
| Ultrasonic Testing (UT) | Detects internal voids and wall thickness variations. | Class A / AAA |
| Metallurgy Analysis | Verified uniform grain structure (Level 8 or finer). | ASTM E112 |
5. GH4169 Technical Specifications for Heat Exchangers
Our materials are produced via the VIM + VAR dual-vacuum melting process, ensuring the ultra-high purity required for thin-walled exchanger tubing.
| Material Performance Data | Value |
|---|---|
| Grade Designation | GH4169 / Inconel 718 / UNS N07718 |
| Max Service Temp | 700°C (1292°F) continuous structural load |
| Yield Strength (650°C) | ≥ 850 MPa |
| Thermal Conductivity | Optimized for efficient heat transfer in reactors |
Available Dimensions (U-Bending Available):
| Type | Outer Diameter (OD) | Wall Thickness (WT) | Typical Standard |
| Seamless Tube | 6.0 mm - 50.8 mm | 0.5 mm - 5.0 mm | ASTM B163 / B637 |
| Precision Tubing | 3.18 mm - 12.7 mm | 0.2 mm - 1.5 mm | AMS 5589 / 5590 |
| Custom Lengths | Up to 18,000 mm | Cut-to-Size | Custom Project Spec |
Why choose to source GH4169 pipes from Gnee Steel's PED-certified factory?
✅️Direct Factory Pricing: By eliminating middleman markups, we save you 15-20% on your procurement budget for premium superalloys.
✅️ISO 9001 Quality Audit: Our management system is audited for total consistency, ensuring the 1,000th tube is as perfect as the 1st.
✅️Global Logistics Support: Experienced in handling documentation for Europe (CE marking support), USA, and Asia.
✅️Wholesale Inventory: We maintain a strategic stock of raw materials to ensure Short Lead Times for emergency maintenance shutdowns.
Gnee Steel 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 Steel GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Is GH4169 suitable for high-pressure hydrogen heat exchangers?
A: Yes. GH4169 has exceptional resistance to hydrogen embrittlement due to its stable face-centered cubic (FCC) austenite matrix, making it a premier choice for modern hydrogen-based energy systems.
Q2: What is the benefit of the PED certification for non-European projects?
A: PED certification is one of the world's most rigorous material standards. Even if your project is in the USA or SE Asia, a PED-certified manufacturer guarantees a higher level of safety and quality control than standard commercial suppliers.
Q3: Can you provide U-bent tubes for heat exchanger bundles?
A: Absolutely. We offer Custom Fabrication, including precision U-bending, stress-relief annealing of the bend area, and 100% hydrostatic testing after bending to ensure Zero-Leakage.
Q4: Do you support small-batch trial orders for R&D?
A: Yes. We support innovation in the energy sector. We offer flexible MOQs for standard sizes in our Wholesale Inventory.
