Carbon Steel Low Fin Tube For Oil Coolers And Condensers
Carbon Steel Low Fin Tube Overview
Low fin tubes (also called integral fin tubes) are used in heat exchangers, boilers, and condensers to enhance heat transfer efficiency. Their strength depends on material properties, fin geometry, and manufacturing processes.
Material Strength Properties
| Property | ASTM A179 | ASTM A192 | ASTM A210 |
| Tensile Strength | ≥325 MPa | ≥325 MPa | ≥415 MPa |
| Yield Strength | ≥180 MPa | ≥180 MPa | ≥255 MPa |
| Elongation (%) | ≥35% | ≥35% | ≥30% |
| Hardness (HB) | ≤72 HRB | ≤77 HRB | ≤79 HRB |
Material Applications:
• A179: Best for low-pressure heat exchangers
• A192: Higher pressure applications (boilers)
• A210 (Grade A1): Higher strength for power plants
Fin Geometry & Structural Impact
| Parameter | Typical Range | Effect on Strength |
| Fin Height | 0.8-1.5 mm | ↑ Height → ↓ Burst Pressure |
| Fin Pitch | 19-40 fins/inch | Denser fins → Slightly weaker |
| Base Wall Thickness | 1.2-3.0 mm | Thicker → Higher pressure rating |
Burst Pressure: Typically 20-30% lower than smooth tubes due to fin formation.
Collapse Strength: Fins add rigidity but reduce internal pressure resistance.
Performance Comparison: Low Fin vs. Smooth Tubes
| Property | Low Fin Tube | Smooth Tube |
| Tensile Strength | Similar | Similar |
| Burst Pressure | ~70-80% of smooth | 100% (reference) |
| Fatigue Resistance | Slightly lower | Higher |
| Corrosion Resistance | Similar (but fins trap deposits) | Better for clean fluids |
Recommended Applications
✓ Heat Exchangers (oil coolers, condensers)
✓ Boiler Economizers (improved heat transfer)
✓ Low-Pressure Steam Systems
Usage Limitations
✗ High-Pressure Steam (>1000 psi)
✗ Highly Corrosive Fluids (fins trap deposits)
✗ High-Vibration Environments (risk of fin fatigue)
Key Takeaways
- Strength approximately 70-90% of smooth tubes (depends on fin design)
- Optimal for heat transfer efficiency, not extreme pressure applications
- Material selection (A179/A192/A210) significantly affects performance
