ASME SB163 N04400 G Type Finned Tube with Al99.5 Fins For Heat Exchanger
The ASME SB163 N04400 G Type Finned Tube refers to a type of heat exchanger tube made from Monel 400 alloy (UNS N04400) with G-type fins. Monel 400 is a nickel-copper alloy known for its exceptional corrosion resistance, especially in marine and chemical environments. The G-type fin refers to a particular design of external fins that enhance the thermal performance of the tube by increasing its surface area for heat transfer.
Key features of ASME SB163 N04400 G Type Finned Tube with Al99.5 Fins:
1. Material ASME SB163 N04400
(1) Chemical Composition of ASME SB163 N04400 (Alloy 400)
Alloy 400 is a nickel-copper (Ni-Cu) alloy with excellent corrosion resistance. The composition (wt.%) is:
| Element | Min (%) | Max (%) |
| Nickel (Ni) | 63.0 | 70.0 |
| Copper (Cu) | 28.0 | 34.0 |
| Iron (Fe) | - | 2.5 |
| Manganese (Mn) | - | 2.0 |
| Carbon (C) | - | 0.3 |
| Silicon (Si) | - | 0.5 |
| Sulfur (S) | - | 0.024 |
Key Notes:
Primary Phase: Solid solution of Ni-Cu, providing good ductility and weldability.
Resistance: Excellent against seawater, sulfuric & hydrochloric acids, and alkaline solutions.
No Molybdenum or Chromium, unlike more corrosion-resistant alloys like Inconel.
(2) Mechanical Properties of ASME SB163 N04400
The mechanical properties vary based on temper (annealed, cold-worked, etc.). Typical values for seamless tubes (SB163) are:
Room Temperature Properties (Annealed Condition)
| Property | Value |
| Tensile Strength (UTS) | ≥ 550 MPa (80 ksi) |
| Yield Strength (0.2% YS) | ≥ 240 MPa (35 ksi) |
| Elongation (% in 50mm) | ≥ 35% |
| Hardness (Rockwell B) | ~65-85 HRB |
Elevated Temperature Strength
| Temperature | Tensile Strength (MPa) |
| 200°C (392°F) | ~480 |
| 400°C (752°F) | ~380 |
Impact Toughness & Other Properties
Charpy Impact (V-Notch): ~100 J (high toughness)
Modulus of Elasticity: ~170 GPa (24.6 x 10⁶ psi)
Density: 8.8 g/cm³
Comparison with Other Nickel Alloys
| Property | Alloy 400 (N04400) | Inconel 600 (N06600) | Monel 400 vs. 304 SS |
| Main Elements | Ni-Cu | Ni-Cr-Fe | Fe-Cr-Ni |
| Corrosion Resistance | Excellent in acids, seawater | Better in oxidizing environments | Less resistant than Alloy 400 |
| Max Temp. (°C) | ~500 | ~1100 | ~900 |
| Typical Use | Marine, chemical processing | High-temp furnaces | General-purpose SS |
Key Takeaways:
- N04400 (Alloy 400) is strong, ductile, and corrosion-resistant, making it ideal for heat exchangers, condensers, and marine applications.
- G-Type finned tubes with AL99.5 fins leverage its corrosion resistance while enhancing heat transfer via aluminum fins.
2. G Type Finned Tube
G Type (Embedded Fins): This refers to a finned tube design where the fins are mechanically embedded into the base tube (N04400 in this case) for strong metallurgical bonding.
Common Fin Types:
L-Foot (L Type) – Fins wrapped around the tube.
G-Foot (G Type) – Fins are embedded into grooves for better heat transfer and mechanical stability.
3. AL99.5 Fins
AL99.5: High-purity aluminum (99.5% pure) used for the fins due to its excellent thermal conductivity, lightweight, and corrosion resistance.
Why Aluminum Fins?
- Enhances heat transfer efficiency.
- Cost-effective compared to nickel alloy fins.
- Resistant to oxidation in many environments.
4. Key Benefits of ASME SB163 N04400 G Type Finned Tube with Al99.5 Fins:
- The G-type fin design improves tube heat transfer efficiency by increasing surface area.
- Monel 400 offers outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion in harsh environments.
- Suitable for high-temperature and high-corrosion applications, making it highly versatile for industrial heat transfer systems.
The primary applications of ASME SB163 N04400 G-type finned tubes include:
1. Heat Exchangers
- Used in shell and tube heat exchangers, air-cooled heat exchangers, and other thermal systems due to the enhanced thermal efficiency provided by the fins and Monel 400's corrosion resistance.
- Suitable for applications requiring efficient heat transfer in corrosive environments, such as marine and industrial processes.
2. Petrochemical and Chemical Processing
- Ideal for use in chemical production plants due to its resistance to acids, alkalis, and saline solutions. The finned tube improves the heat transfer in processes involving corrosive media.
- Commonly found in reactors, condensers, and other heat transfer equipment in these industries.
3. Marine Applications
- Excellent for heat exchangers in seawater cooling systems, desalination plants, and shipbuilding due to Monel 400's resistance to saltwater and marine atmospheres.
4. Oil and Gas Industry
- Used in offshore platforms and refineries for heat exchange systems where resistance to sour gas (hydrogen sulfide) and seawater is essential.
- Suitable for cooling and heating fluids in harsh environments.
5. Power Generation
- Applied in power plants, especially in environments where corrosion resistance is vital, such as cooling systems facing seawater or fouling conditions.
6. Aerospace Industry
- Used in thermal systems exposed to corrosive fluids or environments due to the alloy's ability to withstand extreme conditions.
7. Pollution Control Equipment
- Incorporated in heat exchangers for emissions control systems, such as scrubbers, where corrosive chemical exposure is common.
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