Copper Pipes, Tubes, Coils & Fittings
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Copper Nickel 70/30 Pipes & Tubes
Product Overview
Copper Nickel 70/30 Pipes & Tubes (CuNi 70/30) are high-performance copper-nickel alloy products engineered for demanding marine, offshore, and industrial fluid-handling applications. With approximately 70% copper and 30% nickel, along with controlled additions of iron and manganese, this alloy offers superior mechanical strength, exceptional resistance to seawater corrosion, erosion corrosion, biofouling, and stress corrosion cracking.
Compared to Copper Nickel 90/10, the 70/30 grade delivers enhanced durability and erosion resistance at higher flow velocities, making it the preferred choice for critical systems such as shipbuilding, naval engineering, desalination plants, offshore oil & gas coolers, power plant condensers, and coastal industrial installations. The alloy maintains stable performance across a wide range of pressures and temperatures, ensuring long service life in aggressive environments.
R V Metal Corporation supplies Copper Nickel 70/30 Pipes & Tubes in seamless form, manufactured through hot extrusion and cold drawing, and delivered in annealed, stress-relieved, or as-drawn conditions as per application requirements. Products are available in a wide range of diameters, wall thicknesses, and cut-to-length options, conforming to ASTM, EN, BS, DIN, IS, and other international standards, supported by comprehensive testing and certified mill test documentation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | Copper Nickel Alloy 70/30 (CuNi 70/30) |
| Copper (Cu) | Balance (~68.5 – 71.5%) |
| Nickel (Ni) | 29.0 – 32.0% |
| Iron (Fe) | 0.4 – 1.0% (for erosion resistance) |
| Manganese (Mn) | 0.5 – 1.0% |
| Manufacturing Process | Seamless – Hot Extruded & Cold Drawn |
| Supply Condition | Annealed (O61), Stress Relieved, As-Drawn |
| Outside Diameter Range | 6 mm to 324 mm (Custom sizes on request) |
| Wall Thickness Range | 0.7 mm to 20 mm |
| Standard Length | 6 m, 12 m, or Random Lengths |
| Maximum Working Temperature | Up to 300°C (application dependent) |
| Design Pressure Capability | Suitable for high-pressure seawater & brine systems |
| Corrosion Resistance | Excellent resistance to seawater, biofouling, erosion corrosion |
| Surface Finish | Bright Drawn / Mill Finish / Pickled |
| Non-Destructive Testing | Eddy Current Test (ECT) / Ultrasonic Test (UT) |
| Pressure Testing | Hydrostatic Testing as per applicable standards |
| Dimensional Tolerance | As per ASTM / EN / BS standards |
| Standards Compliance | ASTM B466 / B467, EN 12451, BS 2871, DIN 86019, IS equivalents |
| Certification | Mill Test Certificate (EN 10204 3.1) |
| Typical Applications | Marine piping, offshore platforms, heat exchangers, desalination plants |
Chemical Composition
| Element | Chemical Symbol | Composition (% by Weight) |
|---|---|---|
| Copper | Cu | Balance (Approx. 68.5 – 71.5%) |
| Nickel | Ni | 29.0 – 32.0% |
| Iron | Fe | 0.4 – 1.0% |
| Manganese | Mn | 0.5 – 1.0% |
| Carbon | C | Max 0.05% |
| Silicon | Si | Max 0.15% |
| Sulphur | S | Max 0.02% |
| Lead | Pb | Max 0.02% |
| Zinc | Zn | Max 0.50% |
| Phosphorus | P | Max 0.02% |
UNS Codes & Grades
| Standard / System | Grade / Designation | UNS Code | Description / Notes |
|---|---|---|---|
| UNS (Unified Numbering System) | Cu-Ni 70/30 | C71500 | Standard Copper Nickel 70/30 alloy with Fe & Mn for seawater service |
| ASTM | B466 / B467 | C71500 | Seamless & welded pipes and tubes for condensers, heat exchangers |
| EN | CuNi30Mn1Fe | C71500 | European designation for 70/30 copper-nickel alloy |
| DIN | 2.0882 | C71500 | DIN material number for CuNi30Mn1Fe alloy |
| BS | CN107 / CN108 | C71500 | British Standard grades for marine condenser tubes |
| ISO | ISO 1634 – CuNi30Mn1Fe | C71500 | International ISO designation for 70/30 Cu-Ni alloy |
| JIS | C7150T | C71500 | Japanese Industrial Standard for Cu-Ni 70/30 tubes |
| Naval / Marine | 70/30 Cu-Ni (Marine Grade) | C71500 | Used in naval shipbuilding, offshore platforms, desalination plants |
Mechanical, Physical & Fabrication Properties
| Property Category | Property | Typical Value | Unit | Remarks / Engineering Notes |
|---|---|---|---|---|
| Mechanical Properties | Tensile Strength (Annealed) | 360 – 450 | MPa | Used for condenser & heat exchanger tubing |
| Tensile Strength (Cold Worked) | 480 – 620 | MPa | Higher pressure & structural tubing | |
| Yield Strength (0.2% Proof) | 120 – 260 | MPa | Depends on temper and % cold work | |
| Elongation | 25 – 40 | % | Excellent ductility even at higher strengths | |
| Hardness | 80 – 150 | HB | Wide range due to temper variation | |
| Physical Properties | Density | 8.94 | g/cm³ | Used for accurate weight calculations |
| Melting Range | 1170 – 1240 | °C | Higher than pure copper due to nickel | |
| Thermal Conductivity | 29 – 35 | W/m·K | Lower than Cu, but stable in seawater | |
| Electrical Conductivity | 5 – 7 | % IACS | Not intended for electrical applications | |
| Coefficient of Thermal Expansion | 16.5 | µm/m·°C | Low thermal movement in long pipe runs | |
| Fabrication Properties | Formability | Excellent | — | Cold bending possible without cracking |
| Weldability | Excellent | — | TIG / MIG / SMAW suitable | |
| Brazability | Good | — | Requires correct filler alloys | |
| Machinability | Moderate | % (Relative) | Harder than brass, slower cutting speeds | |
| Hot Workability | Good | — | Preferred forging range: 850–950°C | |
| Corrosion Resistance | Outstanding | — | Excellent resistance to seawater, biofouling, erosion |
Common Names & International Identifiers
| Category | Identifier / Name | Standard / Authority | Description / Usage Context |
|---|---|---|---|
| UNS Designation | C71500 | Unified Numbering System (UNS) | Primary international material designation for Cu-Ni 70/30 |
| ASTM Designation | Cu-Ni 70/30 | ASTM | Used in ASTM B466 / B467 for pipes & tubes |
| ISO Designation | CuNi30Mn1Fe | ISO 1634 / ISO 9722 | European / international material identification |
| EN Designation | CW354H | EN 12451 / EN 12449 | European wrought copper-nickel alloy designation |
| DIN Designation | 2.0882 | DIN | Legacy German standard reference |
| BS Designation | CN107 | British Standard (BS) | Marine & condenser tubing applications |
| JIS Designation | C7150T | JIS H3300 | Japanese industrial copper-nickel tubing |
| Trade / Industry Name | 70/30 Copper Nickel | Industry Common Name | Widely used in shipbuilding & offshore projects |
| Alternate Industry Name | Cu-Ni 70-30 Alloy | Industry / EPC Usage | Commonly referenced in EPC tender documents |
| Marine Industry Name | Marine Copper Nickel 70/30 | Shipbuilding / Offshore | Specifically denotes seawater service suitability |
| Heat Exchanger Name | Cu-Ni 70/30 Condenser Tubes | Power & Process Industry | Used in condensers, coolers, evaporators |
| Oil & Gas Reference | Seawater-Resistant Cu-Ni Alloy | Oil & Gas EPC Specs | Firewater, ballast, cooling & injection lines |
Standards & International Equivalents
| Standard Body | Standard Number | Material Designation | Product Form Covered | Typical Application |
|---|---|---|---|---|
| ASTM | ASTM B466 | UNS C71500 | Seamless Copper-Nickel Pipe | Marine, seawater, condenser & heat exchanger piping |
| ASTM | ASTM B467 | UNS C71500 | Welded Copper-Nickel Pipe | Large diameter marine & offshore piping |
| ASTM | ASTM B111 | UNS C71500 | Condenser & Heat Exchanger Tubes | Power plants, refineries, desalination |
| ASME | ASME SB-466 | UNS C71500 | Seamless Pipe | Pressure systems under ASME Boiler Code |
| ASME | ASME SB-467 | UNS C71500 | Welded Pipe | ASME pressure piping & process lines |
| EN | EN 12451 | CW354H (CuNi30Mn1Fe) | Seamless Tubes | Marine, offshore, seawater service |
| EN | EN 12449 | CW354H | Wrought Copper-Nickel Products | General industrial & marine applications |
| ISO | ISO 1634 / ISO 9722 | CuNi30Mn1Fe | Pipes & Tubes | International marine & heat exchanger use |
| DIN | DIN 86019 / DIN 1785 | 2.0882 | Pipes & Tubes | Legacy German marine installations |
| BS | BS 2871 / BS 2872 | CN107 | Pipes & Tubes | Naval, shipbuilding, seawater lines |
| JIS | JIS H3300 | C7150T | Pipes & Tubes | Japanese industrial & marine systems |
| Indian Standard | IS 1545 / IS 410 | Cu-Ni 70/30 | Pipes & Tubes | Marine, condenser & industrial use in India |
| Lloyd’s Register | LR Rules | Cu-Ni 70/30 | Marine Pipes & Tubes | Ship classification & offshore certification |
| DNV / ABS | DNV-GL / ABS Rules | Cu-Ni 70/30 | Marine & Offshore Piping | Seawater, ballast & firewater systems |
Applications
| Industry / Sector | System / Equipment | Operating Medium | Why Cu-Ni 70/30 is Specified | Typical Standards Referenced |
|---|---|---|---|---|
| Marine & Shipbuilding | Seawater cooling lines | Raw seawater | Excellent resistance to erosion-corrosion, bio-fouling, and cavitation at high flow velocities | ASTM B466 / B467, EN 12451 |
| Marine & Shipbuilding | Ballast water systems | Seawater | High strength and corrosion resistance under stagnant and flowing seawater conditions | ASTM B466, BS 2871 |
| Marine & Offshore | Firewater piping systems | Seawater / treated seawater | Maintains integrity during long idle periods and emergency high-velocity discharge | ASTM B466, DNV / ABS Rules |
| Offshore Platforms | Desalination plant piping | Seawater / brine | Superior resistance to chloride attack and erosion in high-salinity environments | ASTM B466, ISO 1634 |
| Power Generation | Condenser tubes & piping | Cooling seawater | High thermal conductivity with long service life under aggressive cooling conditions | ASTM B111, ASME SB-466 |
| Oil & Gas | Heat exchanger piping | Seawater / cooling fluids | Resists sulfide-induced corrosion and high-velocity erosion | ASTM B466, ASME Section II |
| Naval Defense | Submarine & naval vessel piping | Seawater | High mechanical strength and fatigue resistance in dynamic marine conditions | DEF STAN, ASTM B466 |
| Ship Repair & Retrofit | Replacement seawater lines | Seawater | Compatibility with existing Cu-Ni systems and long-term corrosion stability | ASTM B466, BS 2871 |
| Desalination Plants | Brine circulation pipelines | High-salinity brine | High resistance to pitting, crevice corrosion, and erosion at elevated temperatures | ASTM B466, EN 12451 |
| Industrial Cooling | Cooling water distribution networks | Seawater / recycled water | Stable performance under continuous high flow and temperature variations | ASTM B466, ISO 9722 |
Standard Copper Nickel 70/30 Pipes & Tubes Dimensional Chart
| Copper Nickel 70/30 (CuNi 70/30) Pipes & Tubes – Standard Dimensional & Theoretical Weight Chart (NPS) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| NPS (in.) |
OD (mm) |
SCH 10 | SCH 40 | SCH 80 | ||||||
| WT (mm) | ID (mm) | Wt (kg/m) | WT (mm) | ID (mm) | Wt (kg/m) | WT (mm) | ID (mm) | Wt (kg/m) | ||
| 1/2 | 21.34 | 1.65 | 18.04 | 0.91 | 2.77 | 15.80 | 1.44 | 3.73 | 13.88 | 1.84 |
| 3/4 | 26.67 | 1.65 | 23.37 | 1.16 | 2.87 | 20.93 | 1.91 | 3.91 | 18.85 | 2.52 |
| 1 | 33.40 | 1.65 | 30.10 | 1.47 | 3.38 | 26.64 | 2.98 | 4.55 | 24.30 | 3.93 |
| 1-1/4 | 42.16 | 1.65 | 38.86 | 1.87 | 3.56 | 35.04 | 3.93 | 4.85 | 32.46 | 5.25 |
| 1-1/2 | 48.26 | 1.65 | 44.96 | 2.14 | 3.68 | 40.90 | 4.66 | 5.08 | 38.10 | 6.31 |
| 2 | 60.33 | 1.65 | 57.03 | 2.69 | 3.91 | 52.51 | 6.07 | 5.54 | 49.25 | 8.36 |
| 2-1/2 | 73.03 | 2.11 | 68.81 | 4.09 | 5.16 | 62.71 | 9.71 | 7.01 | 59.01 | 12.95 |
| 3 | 88.90 | 2.11 | 84.68 | 4.99 | 5.49 | 77.92 | 12.64 | 7.62 | 73.66 | 17.03 |
| 4 | 114.30 | 2.11 | 110.08 | 6.42 | 6.02 | 102.26 | 17.98 | 8.56 | 97.18 | 25.08 |
| 5 | 141.30 | 2.77 | 135.76 | 10.67 | 6.55 | 128.20 | 24.46 | 9.53 | 122.24 | 34.87 |
| 6 | 168.28 | 2.77 | 162.74 | 12.76 | 7.11 | 154.06 | 32.29 | 10.97 | 146.34 | 48.34 |
| 8 | 219.08 | 3.76 | 211.56 | 22.48 | 8.18 | 202.72 | 47.07 | 12.70 | 193.68 | 71.20 |
Note (Theoretical Weight Basis):
- Weights are theoretical and calculated from OD & wall thickness using a density of 8.94 g/cm³ (≈ 8940 kg/m³).
- Actual supply weight may vary due to manufacturing tolerances, ovality, straightness, and finishing/inspection requirements.
- Common standards followed for CuNi 70/30 include ASTM/ASME/EN specifications; confirm project schedule class, test requirements, and end-prep before ordering.
