ASTM B111 C70600 Extruded Finned Tubes
ASTM B111 C70600 Extruded Finned Tubes are premium heat transfer components manufactured from seamless 90/10 copper-nickel alloy tubes. Through a precision cold extrusion process, the base tube material is plastically formed into integral fins without mechanical bonding or welding. This manufacturing method produces a continuous one-piece fin structure that offers excellent thermal conductivity, outstanding corrosion resistance, and exceptional mechanical integrity.
C70600 copper-nickel alloy combines high resistance to seawater corrosion, biofouling, erosion, and chloride-containing environments with excellent thermal performance, making it one of the preferred materials for marine condensers, offshore platforms, desalination plants, shipbuilding, power generation, and chemical processing industries.
Extruded finned tubes maximize external surface area while maintaining superior heat transfer efficiency, providing longer service life and reduced maintenance costs compared with conventional finned tube constructions.
Features & Benefits
- Integral fin construction with no fin-to-tube interface resistance
- Excellent thermal conductivity for high-efficiency heat transfer
- Outstanding resistance to seawater corrosion and chloride attack
- Superior resistance to erosion caused by high-velocity fluids
- Excellent resistance to marine biofouling
- High mechanical strength and long fatigue life
- No galvanic corrosion between fin and tube
- Excellent dimensional accuracy and fin uniformity
- Suitable for continuous service in harsh marine environments
- Low maintenance and extended operational life
Typical Applications
ASTM B111 C70600 Extruded Finned Tubes are widely used in:
- Marine heat exchangers
- Seawater condensers
- Offshore oil & gas platforms
- Shipbuilding cooling systems
- Desalination plants
- Power station condensers
- Petrochemical heat exchangers
- LNG terminals
- HVAC seawater cooling systems
- Industrial cooling equipment
Manufacturing Process
Extruded finned tubes are manufactured by plastically deforming the outer surface of the copper-nickel tube using specialized rolling equipment. During extrusion, the tube wall is displaced outward to form continuous integral fins.
Since both the fins and tube are produced from the same parent material, the finished product provides:
- Excellent fin adhesion
- No risk of fin separation
- Minimal thermal contact resistance
- Superior vibration resistance
- Long-term reliability under cyclic loading
Standard Specifications
| Item |
Specification |
| Base Tube Standard |
ASTM B111 |
| Material Grade |
C70600 (90/10 Copper Nickel) |
| Manufacturing Process |
Cold Extruded Integral Fin |
| Tube Type |
Seamless Copper-Nickel Tube |
| Fin Type |
Extruded Integral Fin |
| Surface Finish |
Bright or Mill Finish |
| Delivery Condition |
Straight Lengths |
Common Size Range
Base Tube Outside Diameter
- 12.70 mm (1/2")
- 15.88 mm (5/8")
- 19.05 mm (3/4")
- 22.23 mm (7/8")
- 25.40 mm (1")
- 31.75 mm (1-1/4")
- 38.10 mm (1-1/2")
Tube Wall Thickness
Tube Length
- Up to 18 meters
- Custom lengths available
Fin Height
Fin Thickness
Fin Pitch
- 8–20 fins per inch (FPI)
- Approximately 1.3–3.2 mm fin spacing
Custom fin geometries can be manufactured according to customer thermal design requirements.
Chemical Composition (ASTM B111 C70600)
| Element |
Composition (%) |
| Copper (Cu) |
Balance |
| Nickel (Ni) |
9.0–11.0 |
| Iron (Fe) |
1.0–1.8 |
| Manganese (Mn) |
1.0 max |
| Zinc (Zn) |
1.0 max |
| Lead (Pb) |
0.05 max |
| Carbon (C) |
0.05 max |
| Sulfur (S) |
0.02 max |
Mechanical Properties
| Property |
Typical Value |
| Tensile Strength |
≥310 MPa |
| Yield Strength (0.5% Extension) |
≥105 MPa |
| Elongation |
≥30% |
| Hardness |
Typically 70–100 HRB (temper dependent) |
| Thermal Conductivity |
Approximately 50 W/m·K |
| Density |
8.94 g/cm³ |
Mechanical properties may vary depending on temper, tube dimensions, and manufacturing condition.
Inspection & Testing
Every batch of ASTM B111 C70600 Extruded Finned Tubes undergoes comprehensive quality inspection to ensure compliance with international standards.
Typical inspections include:
- Raw material verification
- Chemical composition analysis
- Mechanical property testing
- Dimensional inspection
- Fin geometry measurement
- Visual surface examination
- Eddy current testing
- Hydrostatic pressure testing
- Air leakage testing
- Ultrasonic testing (UT) upon request
- Positive Material Identification (PMI)
- Flattening test
- Flaring test
- Expansion test
- Hardness testing
- Straightness inspection
- Tube end inspection
- Packing inspection
Third-party inspections by SGS, TÜV, Bureau Veritas (BV), DNV, Lloyd's Register (LR), ABS, and Intertek are available upon customer request.
Quality Assurance
Our manufacturing process follows stringent quality management procedures throughout production. Each finned tube is produced using precision extrusion technology and inspected to ensure:
- Uniform fin height and spacing
- Excellent concentricity
- Strong integral fin structure
- High heat transfer efficiency
- Outstanding corrosion resistance
- Reliable long-term performance
Material traceability is maintained from raw material procurement through final inspection and shipment.
Packaging
Products are carefully packed to prevent fin damage during transportation.
Available packaging options include:
- Wooden cases
- Plywood export crates
- Steel frame bundles
- Protective plastic wrapping
- End caps
- Waterproof packaging
- Custom export packaging
Why Choose Our ASTM B111 C70600 Extruded Finned Tubes?
- Manufactured from premium ASTM B111 C70600 seamless tubes
- Precision cold-extruded integral fin technology
- Excellent seawater corrosion resistance
- High heat transfer efficiency
- Long operational service life
- Strict dimensional control
- Comprehensive quality testing
- Custom sizes and fin configurations available
- Fast production and worldwide delivery
- Technical support for OEM and EPC projects
Our ASTM B111 C70600 Extruded Finned Tubes are engineered for demanding heat exchange applications where superior corrosion resistance, thermal efficiency, and long-term reliability are critical. They are an ideal solution for marine, offshore, desalination, power generation, and industrial cooling systems requiring dependable performance under aggressive operating conditions.
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