C12200 Inner Groove and U Bending Tube
The C12200 inner groove and u-bending tube represents a pinnacle of engineering in the heat exchanger industry. C12200 (also known as DHP copper – Deoxidized High Phosphorus) is a phosphorus-deoxidized copper alloy renowned for its exceptional weldability, corrosion resistance, and thermal conductivity. When combined with inner groove technology and precise U-bending, this tube becomes an indispensable component for high-performance condensers, evaporators, oil coolers, and heat pump systems.
What Makes C12200 the Ideal Material?
- Excellent Thermal Conductivity – Approx. 340–380 W/(m·K), maximizing heat transfer efficiency.
- Superior Corrosion Resistance – Resists pitting, stress corrosion, and galvanic corrosion in HVAC environments.
- High Weldability – Ideal for brazing, soldering, and automated U-bending without cracking.
- Phosphorus Content (0.015%–0.040%) – Improves deoxidation and strengthens grain structure for bending durability.
What Is an Inner Groove Tube?
An inner groove tube (or internally enhanced tube) features spiral or cross-hatched grooves on its inner surface. These micro-channels increase the turbulence of the fluid inside, significantly boosting the heat transfer coefficient compared to smooth bore tubes.
C12200 Inner Groove and U Bending Tube
Key Benefits of Inner Groove Technology:
- 30–50% Higher Heat Transfer Efficiency – Reduces required tube length and material cost.
- Enhanced Nucleate Boiling – Ideal for evaporators where refrigerant phase change occurs.
- Lower Pressure Drop – Optimized groove geometry balances turbulence and flow resistance.
- Compact System Design – Allows smaller footprint heat exchangers without performance loss.
Precision U-Bending for Heat Exchanger Assemblies
U-bending transforms straight inner groove tubes into U-shaped configurations, allowing compact, multi-pass flow arrangements in shell-and-tube or coil heat exchangers.
Manufacturing Excellence:
- Mandrel Bending – Prevents wrinkling or collapse of inner grooves.
- Annealing After Bending – Relieves stress and restores ductility.
- Tight Radius Control – Achieves bend radii as low as 1.5× tube OD without compromising internal groove geometry.
Why U-Bending Matters:
- Space Savings – U-bends double the flow path length within a given shell length.
- Thermal Expansion Management – Allows natural expansion and contraction without stress fractures.
- Simplified Header Design – Reduces the number of external connections compared to multiple straight tubes.
Applications of C12200 Inner Groove U-Bent Tubes
| Industry | Equipment | Role of the Tube |
|---|---|---|
| HVAC & Refrigeration | Chillers, Condensers | Enhances refrigerant-side heat transfer |
| Power Generation | Oil Coolers, Steam condensers | Improves cooling water efficiency |
| Automotive | EV battery thermal management systems | Uniform temperature control via U-bent coils |
| Marine | Freshwater/distillers | Resists seawater corrosion |
| Industrial | Air dryers, Hydraulic oil coolers | Compact, high-duty heat exchange |
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Material | C12200 (UNS C12200, DIN 2.0090) |
| Outer Diameter | 6 mm – 16 mm (customizable) |
| Wall Thickness | 0.5 mm – 2.0 mm |
| Inner Groove Pattern | Helical / Cross / Herringbone |
| Number of Grooves | 8 – 60 (depends on diameter) |
| Groove Depth | 0.15 – 0.35 mm |
| Bend Radius (R) | 1.5×OD – 3×OD |
| Leg Length | 50 mm – 3000 mm |
| Temper | Annealed (O60) |
| Standard | ASTM B359 |
Quality Control & Testing
To ensure reliability in critical applications, each batch undergoes:
- Eddy Current Testing – Detects internal flaws or groove deformities.
- Hydrostatic Pressure Test – Verifies leak tightness up to 10 MPa.
- Metallographic Examination – Confirms grain structure and groove integrity after bending.
- Dimensional Inspection – Laser-based profile measurement for inner grooves.
Why Choose Our C12200 Inner Groove U-Bent Tubes?
- OEM/ODM capabilities – custom diameters, groove patterns, and U-leg lengths.
- Strict compliance with ASTM B359 standard.
- Fast lead times with anti-corrosion packaging for sea or air freight.
- Technical support for brazing and coil assembly.
Frequently Asked Questions (FAQ)
Q1: Can the inner groove pattern be customized for specific refrigerants?
A1: Yes – groove geometry (lead angle, rib height) can be optimized for R410A, R32, or CO₂ systems.
Q2: Is there any performance loss due to U-bending?
A2: No. With proper mandrel bending and heat treatment, the inner grooves remain fully functional.