Introduction to C71500 Material
Copper Nickel Alloy UNS C71500, widely recognized as copper nickel 70/30, is a premium copper alloy offering outstanding resistance to corrosion and erosion. While standard copper alloys perform well in general applications, the c71500 material is specifically engineered for severe marine environments and high-temperature industrial applications.
By alloying approximately 70% copper and 30% nickel with the addition of iron and manganese, this material provides superior performance against impingement attack and stress corrosion cracking. Whether you are sourcing for heat exchangers, condensers, or offshore piping systems, the c71500 copper pipe is the industry standard for reliability.
Manufacturing Standards & Specifications
For procurement professionals and engineers, adherence to international standards is critical. We manufacture and supply c71500 copper nickel pipes and tubes strictly according to the following major specifications:
Seamless Condenser Tubes: ASTM B111 / sb111 c71500 / asme sb111 c715
Seamless Pipe and Tube: ASTM B466 / asme sb466 c715
Welded Pipe: ASTM B467
(Note: For projects requiring lower nickel content, we also supply ASTM b111 C70600 - Copper Nickel 90/10).
Key Procurement Dimensions:
Outer Diameter (OD): 6.0mm to 350mm
Wall Thickness (WT): 0.5mm to 30mm
Length: Up to 12 meters (Custom lengths available upon request)
Condition: Annealed (O61) or Light Drawn (H55)
Technical Specifications
C71500 Chemical Composition
| Element | Symbol | Composition Range (%) |
| Copper | Cu | Remainder (Min 65.0) |
| Nickel | Ni | 29.0 - 33.0 |
| Iron | Fe | 0.40 - 1.0 |
| Manganese | Mn | 1.0 Max |
| Zinc | Zn | 1.0 Max |
| Lead | Pb | 0.05 Max |
C71500 Mechanical Properties
| Property | Value (Annealed Condition) |
| Tensile Strength | ≥ 345 MPa (50,000 psi) |
| Yield Strength (0.5% Ext.) | ≥ 125 MPa (18,000 psi) |
| Elongation in 2 inches | ≥ 30% |
| Hardness (Rockwell) | B65 Max |
Physical Properties
| Property | Metric Value | Imperial Value |
| C71500 Density | 8.94 g/cm³ | 0.323 lb/in³ |
| Melting Point | 1170 - 1240 °C | 2140 - 2260 °F |
| Thermal Conductivity | 29 W/m·K | 17 Btu/sq ft/ft hr/°F |
| Coefficient of Thermal Expansion | 16.2 µm/m·K (20-300°C) | 9.0 x 10⁻⁶ in/in·°F |
Machinability and Fabrication
The 70/30 copper nickel machinability rating is approximately 20% compared to free-cutting brass (100%). While it requires lower machining speeds and adequate lubrication, the alloy exhibits excellent cold working and hot working capacities.
c71500 copper pipe can be easily bent, flanged, and flared for condenser tube sheet installations. For welding, Gas Tungsten Arc Welding (GTAW/TIG) and Gas Metal Arc Welding (GMAW/MIG) are highly recommended, using AWS A5.7 ERCuNi filler metals to ensure weld integrity matches the base material.
Key Applications
Marine & Shipbuilding: Seawater cooling systems, ballast piping, and sanitary systems.
Power Generation: Heat exchangers and condenser tubes in nuclear and fossil-fuel plants.
Desalination Plants: Multi-stage flash (MSF) desalination evaporators.
Offshore Oil & Gas: Fire water systems and splash-zone sheathing.
Testing & Inspection
To guarantee 100% reliable products for mission-critical applications, every batch of tubes undergoes rigorous testing:
Non-Destructive Testing (NDT): Eddy Current Testing (ECT) and Ultrasonic Testing (UT).
Pressure Testing: Hydrostatic Testing and Pneumatic Testing.
Mechanical Testing: Tensile, Yield, Elongation, Flattening, and Flaring tests.
Chemical Analysis: Direct Reading Optical Emission Spectroscopy (OES) and Positive Material Identification (PMI).
Professional Packaging
To prevent damage during sea and air freight, our packaging standards include:
Plastic end caps on both sides of the pipes to prevent internal contamination.
Bundles wrapped in waterproof PVC packaging.
Securely packed in fumigated wooden cases or wooden crates reinforced with steel straps.
Factory Equipment
Our manufacturing facility is equipped with state-of-the-art machinery, including:
High-tonnage Extrusion Presses.
Precision Cold Pilger Mills and Cold Drawing Benches.
Bright Annealing Roller Hearth Furnaces (oxygen-free environment).
CNC Machining centers for custom tube sheets and flanges.
FAQ
1. What is the equivalent grade for C71500 copper nickel pipe in European standards?
The European equivalent for C71500 copper nickel pipe is generally EN 12449 / EN 12451 grade CW354H, also commonly referred to as CuNi30Mn1Fe.
2. How does C71500 copper nickel pipe compare to ASTM B111 C70600 pipe?
While both are marine-grade alloys, C71500 copper nickel pipe (70/30) has a higher nickel content than ASTM B111 C70600 pipe (90/10). This makes C71500 more resistant to high-velocity seawater and corrosion, but it is also generally more expensive.
3. What are the main applications of C71500 copper pipe?
C71500 copper pipe is primarily used in harsh marine environments, including heat exchangers, ship condensers, offshore platform piping, and desalination plant evaporators.
4. What is the recommended welding process for Copper Nickel Alloy UNS C71500 tubes?
For Copper Nickel Alloy UNS C71500 tubes, Gas Tungsten Arc Welding (GTAW) or TIG welding is highly recommended, utilizing AWS ERCuNi filler wire to maintain the alloy's anti-corrosive properties at the weld joint.
5. Why is the C71500 density important for marine engineering designs?
The C71500 density is 8.94 g/cm³. Engineers must use this specific density value when calculating the total weight of C71500 copper nickel piping systems on ships or offshore rigs to ensure accurate buoyancy and structural load management.
6. Can ASME SB111 C715 seamless tubes be used in high-temperature desalination plants?
Yes, ASME SB111 C715 seamless tubes are highly recommended for multi-stage flash (MSF) desalination plants because they maintain excellent structural integrity and resist brine corrosion at elevated temperatures.
7. How does the 70/30 copper nickel machinability affect the manufacturing of C71500 pipe fittings?
Because the 70/30 copper nickel machinability is rated at 20%, manufacturing C71500 pipe fittings requires rigid tooling, slower cutting speeds, and abundant sulfur-free cutting fluids to prevent work hardening and tool wear.
8. What is the difference between ASME SB111 C715 and ASME SB466 C715 pipes?
ASME SB111 C715 specifically governs seamless copper and copper-alloy condenser tubes and ferrule stock, whereas ASME SB466 C715 covers general seamless copper-nickel pipe and tube requirements.
9. What are the key C71500 mechanical properties that make it suitable for high-pressure condensers?
The critical C71500 mechanical properties include a minimum tensile strength of 345 MPa and a yield strength of 125 MPa in the annealed condition, which ensures the C71500 copper pipe can withstand the high internal pressures of industrial condensers without rupturing.
10. Are sb111 c71500 copper nickel pipes suitable for high-velocity seawater applications?
Yes, sb111 c71500 copper nickel pipes perform exceptionally well in high-velocity seawater (up to 4.5 meters per second), as their high nickel and iron content prevents the erosion-corrosion (impingement attack) commonly seen in standard copper pipes.
