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UNS C71500 Copper Nickel, also known as 70/30 Copper-Nickel, C71500 CuNi30Fe1Mn, or CW354H, is a high-strength copper-nickel alloy containing approximately 70% copper and 30% nickel, with controlled additions of iron and manganese to enhance mechanical strength and seawater corrosion resistance.
It offers superior resistance to stress-corrosion cracking, erosion, and biofouling, even in turbulent or polluted seawater, making it ideal for heat exchangers, condensers, marine piping, and offshore oil & gas systems.
Manufactured in accordance with ASTM B111, ASTM B466, ASTM B122, ASTM B171, and EN 12451, C71500 Copper Nickel Alloy is supplied in tubes, plates, rods, fittings, and coils, with ISO 9001 / ASTM-compliant quality certifications for global export.
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What is UNS C71500 Copper Nickel?
UNS C71500 Copper Nickel Alloy (Copper Nickel 70/30 / CuNi30Fe1Mn) is a high-performance seawater copper nickel alloy widely used in demanding marine and offshore environments. Known for its excellent resistance to corrosion, biofouling, and erosion in seawater systems, C71500 is the preferred material for ASTM B111 copper nickel tube, copper nickel 70/30 pipe, and C71500 condenser tube applications. It is extensively applied in shipbuilding, desalination plants, and heat exchangers where long service life is critical. As a leading copper nickel supplier, manufacturer, and exporter, we provide high-quality marine copper nickel pipe and tubing solutions that meet international standards and support global industrial projects.
Keywords: UNS C71500, Copper Nickel 70/30, CuNi30Fe1Mn, CW354H, ASTM B111 Copper Nickel Tube, 70-30 Cu-Ni Pipe, Marine Condenser Tube, Offshore Seawater System Alloy, Copper Nickel Plate Supplier.
Chemical Composition (Typical %)
| Element | Cu | Ni | Fe | Mn | Pb | Zn | Others |
|---|---|---|---|---|---|---|---|
| Content (%) | 66.0 – 70.0 | 29.0 – 33.0 | 0.4 – 1.0 | 0.5 – 1.0 | ≤0.02 | ≤0.50 | Balance |
Mechanical Properties (Typical)
| Property | Annealed | Cold Worked (H55) | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 380 – 480 | 480 – 550 | ASTM B111 |
| Yield Strength (MPa) | 130 – 180 | 170 – 220 | ASTM B111 |
| Elongation (%) | ≥30 | ≥15 | ASTM B111 |
| Hardness (HV) | 90 – 120 | 120 – 150 | ASTM B111 |
| Density | 8.95 g/cm³ | - | - |
| Thermal Conductivity | 29 W/m·K | - | - |
| Electrical Conductivity | ~4% IACS | - | - |
| Max Working Temp | 350°C (662°F) | - | - |
International Standards
| Standard System | Grade / Specification |
|---|---|
| UNS | C71500 |
| ASTM | B111 (Tube), B122 (Plate/Sheet), B466 (Pipe), B467 (Seamless Pipe & Tube) |
| ASME | SB111, SB122, SB466, SB467 |
| EN (Europe) | CuNi30Mn1Fe (EN 1652 / EN 12451) |
| DIN (Germany) | 2.0882 |
| ISO | CuNi30Fe1Mn |
| JIS (Japan) | C7150 |
Applications of UNS C71500 in Seawater Systems
UNS C71500 Copper Nickel Alloy (Copper Nickel 70/30 / CuNi30Fe1Mn) is widely recognized as a premium seawater copper nickel alloy due to its exceptional resistance to corrosion, biofouling, and erosion in marine environments. It is extensively used in critical seawater systems where reliability and long service life are essential.
🌊 Seawater Piping Systems
C71500 copper nickel 70/30 pipe is commonly used in marine piping networks for transporting seawater in ships, offshore platforms, and coastal facilities. Its resistance to chloride-induced corrosion ensures stable performance even under high flow rates.
⚙️ Heat Exchangers & Condensers
ASTM B111 copper nickel tube and C71500 condenser tube are widely applied in power plants and desalination systems, where continuous exposure to seawater requires materials with excellent thermal conductivity and corrosion resistance.
🚢 Shipbuilding & Marine Engineering
In the shipbuilding industry, marine copper nickel pipe made from C71500 is used for:
Cooling water systems
Firewater systems
Ballast water systems
Its strong anti-biofouling properties help reduce maintenance and improve operational efficiency.
🛢️ Offshore Oil & Gas Platforms
C71500 is ideal for offshore seawater handling systems, including:
Seawater lift lines
Injection systems
Platform cooling circuits
Its higher strength compared to CuNi 90/10 makes it suitable for high-pressure and high-velocity seawater conditions.
💧 Desalination Plants
In desalination facilities, copper nickel 70/30 alloy is used for:
Intake and discharge pipelines
Evaporator and condenser tubing
Its durability ensures long-term operation with minimal scaling and fouling.
Thanks to its superior performance, UNS C71500 is one of the most trusted materials for seawater copper nickel alloy applications, including ASTM B111 copper nickel tube, marine copper nickel pipe, and copper nickel 70/30 piping systems. It remains the preferred choice for industries requiring high corrosion resistance, reliability, and extended service life in seawater environments.
Product Forms & Standard Sizes
1. Seamless Tube / Pipe (ASTM B111 / B466 / EN 12451)
| OD (inch) | OD (mm) | Wall Thickness (mm) | Length | Temper | Application |
|---|---|---|---|---|---|
| 1/4″ | 6.35 | 0.7 | 3 – 6 m | Annealed (O60) | Condenser tubing |
| 3/8″ | 9.52 | 0.9 | 3 – 6 m | Light drawn | Seawater coolers |
| 1/2″ | 12.7 | 1.0 | 3 – 6 m | O61 | Heat exchangers |
| 3/4″ | 19.05 | 1.5 | 3 – 6 m | Cold worked | Power plant pipelines |
| 1″ – 4″ | 25.4 – 101.6 | 1.5 – 6.0 | 3 – 6 m | Annealed / H55 | Marine systems |
| Up to 12″ | 300 mm | 1.5 – 8.0 | 6 m custom | Annealed | Offshore oil cooling |
2. Plate & Sheet (ASTM B122 / B171)
| Thickness (mm) | Width (mm) | Length (mm) | Finish | Application |
|---|---|---|---|---|
| 1.0 – 3.0 | 600 – 1200 | 2000 – 3000 | Mill Finish | Condenser plates |
| 4.0 – 25.0 | 600 – 1500 | 2000 – 6000 | Hot Rolled | Tube sheet & structural plates |
| 30.0 – 50.0 | 600 – 1200 | Custom | Machined | Pressure-resistant base plates |
3. Rod & Bar (ASTM B151)
| Diameter (mm) | Length | Temper | Application |
|---|---|---|---|
| 6 – 150 | 3 m | H55 / M30 | Valves, flanges, connectors |
4. Coil / Strip (ASTM B122)
| Thickness (mm) | Width (mm) | Coil Weight | Finish | Application |
|---|---|---|---|---|
| 0.3 – 2.0 | 10 – 400 | 50 – 250 kg | Bright / Smooth | Flexible tube forming, shielding |
5. Fittings & Flanges (ASTM B466 / B467)
| Type | Size Range | Standard | Application |
|---|---|---|---|
| Elbow / Tee / Reducer | 1/2″ – 12″ | ASTM B466 / B467 | Seawater pipelines |
| Flange (Slip-on / Weld Neck) | 1/2″ – 24″ | ASTM B151 | Shipbuilding & desalination systems |
Key Features & Advantages
Excellent corrosion resistance in seawater and brackish environments
High mechanical strength and resistance to erosion & stress cracking
Outstanding fabrication, welding, and forming properties
Low biofouling tendency; ideal for long-term marine exposure
Excellent thermal conductivity for heat transfer equipment
Compatible with C70600 (90/10 Cu-Ni) and titanium in multi-metal systems
Certified to ASTM / EN / ISO standards for global export
Applications
Marine condensers and heat exchangers
Desalination plant tubing and evaporators
Offshore oil & gas platforms
Power plant feedwater heaters
Seawater pipelines and fire protection systems
Chemical process and refinery heat exchangers
Shipboard cooling and ballast systems
C71500 vs C70600
| Property | C71500 (70/30 CuNi) | C70600 (90/10 CuNi) |
|---|---|---|
| Nickel Content | ~30% | ~10% |
| Strength | Higher | Lower |
| Corrosion Resistance | Excellent (more aggressive seawater) | Very good (milder seawater) |
| Biofouling Resistance | Superior | Good |
| Cost | Higher | More economical |
| Fabrication | Good | Excellent (easier to form) |
Why Choose 70/30 CuNi Over 90/10?
When comparing Copper Nickel 70/30 (UNS C71500 / CuNi30Fe1Mn) with Copper Nickel 90/10 (UNS C70600), the 70/30 alloy offers superior performance in demanding seawater environments, making it the preferred choice for critical marine and offshore applications.
🔥 1. Superior Corrosion Resistance in Harsh Seawater
70/30 CuNi provides enhanced resistance to:
High-velocity seawater
Polluted or oxygenated seawater
Chloride-induced corrosion
👉 Ideal for seawater copper nickel alloy systems and offshore installations
⚙️ 2. Higher Strength & Erosion Resistance
Compared to 90/10, C71500 delivers:
Higher tensile strength
Better resistance to erosion-corrosion
Longer service life under high flow conditions
👉 Best for copper nickel 70/30 pipe and heavy-duty piping systems
🌊 3. Better Anti-Biofouling Performance
70/30 CuNi naturally resists:
Marine organism growth
Biofouling buildup in pipes and tubes
👉 Reduces maintenance cost in marine copper nickel pipe systems
🛢️ 4. Preferred for Offshore & Power Plant Applications
Used extensively in:
Offshore oil & gas platforms
Desalination plants
Power plant condensers (C71500 condenser tube)
👉 Performs reliably in extreme marine environments
💰 5. When NOT to Choose 70/30
Despite its advantages, 70/30 CuNi:
Is more expensive than 90/10
May be unnecessary for low-flow or clean seawater systems
👉 In such cases, 90/10 CuNi (C70600) is a more cost-effective option
FAQ - Frequently Asked Questions
Q1: What's the main difference between C71500 (70/30 Cu-Ni) and C70600 (90/10 Cu-Ni)?
A1: C71500 has higher nickel content (30%), offering greater strength, corrosion, and erosion resistance, especially suitable for polluted seawater or high-pressure systems.
Q2: Is C71500 resistant to biofouling?
A2: Yes. Its copper content prevents marine organism growth, while the nickel enhances oxide film stability, minimizing fouling.
Q3: Can C71500 be welded easily?
A3: Yes. It can be welded using TIG, MIG, or brazing with matching filler metals (AWS A5.7 Class ERCuNi or CuNi30). Cleaning and argon shielding are essential.
Q4: What is the maximum seawater flow velocity for C71500 tubes?
A4: Up to 4.5 m/s in clean seawater - higher than C70600's 3.5 m/s limit, due to its improved impingement resistance.
Q5: Does C71500 require special maintenance in marine service?
A5: Only minimal cleaning is needed. The self-protective oxide layer ensures long-term stability without continuous treatment.
Q6: What certificates and testing are available?
A6:
Mill Test Certificate (EN 10204 3.1 / 3.2)
Eddy Current, Hydrostatic & PMI Testing
Dimensional and Mechanical Inspection Reports
ASTM B111, B466, B122, B171 Compliance
Q7: Is C71500 suitable for high-pressure or offshore systems?
A7: Yes. Its high strength and seawater resistance make it ideal for offshore oil & gas platforms, power stations, and heat recovery systems.
Q8: Can C71500 be used with titanium or stainless steel?
A8: Yes, provided dielectric insulation is used to prevent galvanic corrosion between dissimilar metals.
Supply & Packaging Details
Length: 3 m / 6 m standard, or custom cut
Surface Finish: Mill, polished, or annealed
Marking: Grade + size + heat number + ASTM standard
Packaging: Plastic-capped bundles or seaworthy wooden crates
Certifications: ASTM / EN / ISO 9001 with MTC 3.1
Looking for a dependable UNS C71500 Copper Nickel 70/30 Alloy supplier or exporter?
We provide tubes, plates, rods, fittings, and coils manufactured to ASTM B111, B171, and EN 12451 standards - ideal for marine and offshore industries.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
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