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Copper Nickel 95/5 (CuNi 95/5) / 66-30-2-2 Alloy Pipes & Tubes
Product Overview
Copper Nickel 95/5 (CuNi 95/5) and Copper Nickel 66-30-2-2 alloy pipes and tubes offered by R V Metal Corporation are engineered for high-performance applications involving aggressive seawater, brine, and corrosive industrial environments. These copper-nickel alloys are specifically developed to deliver exceptional resistance to seawater corrosion, biofouling, erosion, and stress corrosion cracking, making them a preferred material choice in marine, offshore, desalination, shipbuilding, power generation, and chemical processing industries. CuNi 95/5 is widely used in low-to-moderate flow seawater systems where long service life and thermal stability are critical, while the 66-30-2-2 alloy—containing nickel, iron, and manganese—offers superior mechanical strength, enhanced erosion resistance, and excellent performance under high-velocity seawater conditions. Manufactured with strict dimensional control and metallurgical precision, these pipes and tubes ensure reliable weldability, consistent wall thickness, and compliance with international standards, meeting the expectations of EPC contractors, naval architects, and industrial consultants worldwide.
Technical Specifications
| Parameter | Copper Nickel 95/5 (CuNi 95/5) | Copper Nickel 66-30-2-2 |
|---|---|---|
| Alloy Designation | CuNi 95/5 | CuNi 66-30-2-2 |
| UNS Number | C70600 | C71500 |
| Nickel Content (%) | 4.0 – 5.5 | 29.0 – 33.0 |
| Iron (Fe) Content (%) | 0.4 – 1.0 | 0.4 – 1.0 |
| Manganese (Mn) Content (%) | ≤ 1.0 | 0.5 – 1.0 |
| Manufacturing Process | Seamless / Welded | Seamless / Welded |
| Available Forms | Pipes, Tubes, Coils, U-Bends | Pipes, Tubes, Coils, U-Bends |
| Outside Diameter Range | 6 mm to 508 mm | 6 mm to 508 mm |
| Wall Thickness Range | 0.8 mm to 25 mm | 1.0 mm to 30 mm |
| Standard Lengths | 6 m, 12 m, or Cut-to-Length | 6 m, 12 m, or Cut-to-Length |
| Heat Treatment | Annealed | Annealed |
| Maximum Service Temperature | Up to 300°C | Up to 350°C |
| Pressure Rating | As per ASTM / EN / ASME | As per ASTM / EN / ASME |
| Corrosion Resistance | Excellent in Seawater & Brine | Superior in High-Velocity Seawater |
| Weldability | Excellent | Excellent |
| Surface Finish | Bright Annealed / Pickled | Bright Annealed / Pickled |
| Applicable Standards | ASTM B466, B467, B111 | ASTM B466, B467, B111 |
| Typical Applications | Seawater Piping, Heat Exchangers | Condensers, Offshore & Marine Systems |
Chemical Composition
| Element | CuNi 95/5 (UNS C70400) (%) | CuNi 66-30-2-2 (UNS C71500) (%) |
|---|---|---|
| Copper (Cu) | Balance (≈ 93.5 – 95.5) | Balance (≈ 64.0 – 68.0) |
| Nickel (Ni) | 4.0 – 6.0 | 29.0 – 33.0 |
| Iron (Fe) | 0.5 – 1.0 | 1.0 – 2.5 |
| Manganese (Mn) | ≤ 1.0 | 0.5 – 2.0 |
| Carbon (C) | ≤ 0.05 | ≤ 0.05 |
| Lead (Pb) | ≤ 0.02 | ≤ 0.02 |
| Sulphur (S) | ≤ 0.02 | ≤ 0.02 |
| Zinc (Zn) | ≤ 0.50 | ≤ 0.50 |
| Other Impurities (Total) | ≤ 0.30 | ≤ 0.30 |
UNS Codes & Grades
| Alloy Designation | UNS No. | Common Name | ASTM Grades | EN / DIN Equivalent | ISO / Other References | Typical Product Form |
|---|---|---|---|---|---|---|
| CuNi 95/5 | C70400 | 90/10 is often misquoted – correct is 95/5 Copper Nickel | ASTM B466, ASTM B467, ASTM B552 | EN CW402J | ISO CuNi5Fe1Mn | Pipes, Tubes, Condenser Tubes |
| CuNi 66-30-2-2 | C71500 | 70/30 Copper Nickel | ASTM B466, ASTM B467, ASTM B552 | EN CW354H | ISO CuNi30Mn1Fe | Pipes, Tubes, Heat Exchanger Tubes |
Mechanical, Physical & Fabrication Properties
| Property | CuNi 95/5 (UNS C70400) | CuNi 66-30-2-2 / 70-30 (UNS C71500) | Remarks (Engineering Use) |
|---|---|---|---|
| Tensile Strength (MPa) | 350 – 450 | 380 – 480 | 70/30 has higher strength for high-pressure marine systems |
| Yield Strength (0.2% Proof) (MPa) | 120 – 180 | 150 – 220 | Important for pressure & vibration resistance |
| Elongation (%) | 30 – 40 | 25 – 35 | Higher elongation = better forming & flaring |
| Hardness (HV) | 80 – 110 | 90 – 130 | Annealed condition unless specified |
| Density (g/cm³) | 8.90 | 8.95 | Used for accurate weight calculations |
| Melting Range (°C) | 1170 – 1240 | 1170 – 1250 | Relevant for brazing & welding procedures |
| Thermal Conductivity (W/m·K) | 50 – 60 | 40 – 50 | 90/10 preferred where heat transfer matters |
| Electrical Conductivity (% IACS) | 8 – 10 | 5 – 7 | Not used for electrical duty — marine focus only |
| Modulus of Elasticity (GPa) | 140 | 150 | Higher modulus = better stiffness under load |
| Corrosion Resistance | Excellent | Outstanding | 70/30 superior in high-velocity seawater |
| Erosion-Corrosion Resistance | Very Good | Excellent | 70/30 used for condenser & cooler tubes |
| Maximum Recommended Seawater Velocity (m/s) | 3.5 – 4.0 | 4.5 – 5.0 | Critical for long-term service life |
| Weldability | Excellent | Excellent | GTAW / GMAW preferred; matching filler mandatory |
| Brazability | Good | Good | Use nickel-compatible brazing alloys |
| Cold Workability | Very Good | Good | 95/5 easier for bending & expansion |
| Hot Workability | Excellent | Excellent | Hot forming range ~750–900 °C |
| Typical Supply Condition | Annealed / Stress Relieved | Annealed / Stress Relieved | Mandatory for marine & heat exchanger tubes |
Common Names & International Identifiers
| Category | Copper Nickel 95/5 (CuNi 95/5) | Copper Nickel 66-30-2-2 / 70-30 (CuNi 70/30) |
|---|---|---|
| UNS Number | C70400 | C71500 |
| ASTM Designation | ASTM B466 / B467 / B552 | ASTM B466 / B467 / B552 |
| EN / DIN Designation | CuNi5Fe1Mn (EN CW352H) | CuNi30Mn1Fe (EN CW354H) |
| ISO Designation | CuNi5Fe1Mn | CuNi30Mn1Fe |
| BS (British Standard) | BS 3074 CN 1 | BS 3074 CN 3 |
| DIN (Germany) | DIN 86019 – CuNi5Fe | DIN 86019 – CuNi30Fe |
| JIS (Japan) | JIS H3300 C7060 | JIS H3300 C7150 |
| ISO Numeric Code | ISO 6207 | ISO 6208 |
| Common Industry Name | Cupronickel 90/10 (Marine Grade) | Cupronickel 70/30 (High Velocity Grade) |
| Alternate Trade Names | 90-10 CuNi, Copper-Nickel Alloy 90/10 | 70-30 CuNi, Copper-Nickel Alloy 70/30 |
| Marine Classification Reference | DNV / ABS / Lloyd’s Approved | DNV / ABS / Lloyd’s Approved |
| Typical EPC / Tender Naming | CuNi 90/10 Seamless Pipes & Tubes | CuNi 70/30 Seamless Pipes & Tubes |
| Heat Exchanger Naming | 90/10 CuNi Condenser Tubes | 70/30 CuNi Condenser & Cooler Tubes |
Standards & International Equivalents
| Standard Body | Copper Nickel 95/5 (CuNi 95/5) | Copper Nickel 66-30-2-2 / 70-30 (CuNi 70/30) |
|---|---|---|
| UNS (Unified Numbering System) | C70400 | C71500 |
| ASTM (USA) | ASTM B466 / B467 / B552 | ASTM B466 / B467 / B552 |
| ASME | ASME SB-466 / SB-467 / SB-552 | ASME SB-466 / SB-467 / SB-552 |
| EN (European Standard) | EN 12451 – CW352H (CuNi5Fe1Mn) | EN 12451 – CW354H (CuNi30Mn1Fe) |
| DIN (Germany) | DIN 86019 – CuNi5Fe | DIN 86019 – CuNi30Fe |
| BS (British Standard) | BS 3074 CN 1 | BS 3074 CN 3 |
| ISO | ISO 6207 | ISO 6208 |
| JIS (Japan) | JIS H3300 – C7060 | JIS H3300 – C7150 |
| GOST (Russia) | GOST 492-2006 (CuNi5Fe) | GOST 492-2006 (CuNi30Fe) |
| Marine Classification | ABS / DNV / Lloyd’s / BV Approved | ABS / DNV / Lloyd’s / BV Approved |
| Heat Exchanger Standards | ASTM B111 (Special Order) | ASTM B111 |
| Typical EPC / Tender Naming | CuNi 90/10 Seamless Pipes & Tubes | CuNi 70/30 Seamless Pipes & Tubes |
Applications
| Application Area | Copper Nickel 95/5 (CuNi 95/5 – UNS C70400) | Copper Nickel 66-30-2-2 / 70-30 (UNS C71500) |
|---|---|---|
| Seawater Piping Systems | Low to moderate velocity seawater lines, ballast systems | High-velocity seawater piping, main intake & discharge lines |
| Heat Exchangers & Condensers | Freshwater & mildly corrosive cooling media | Marine condensers, seawater-cooled heat exchangers |
| Desalination Plants | Brine transfer at lower flow rates | MSF / MED desalination units, brine heaters |
| Shipbuilding & Marine Engineering | Auxiliary seawater circuits, overflow lines | Firefighting lines, bilge, ballast & seawater services |
| Offshore Oil & Gas Platforms | Utility piping, non-critical seawater services | Seawater injection, cooling, splash-zone piping |
| Power Plants | Cooling water lines with controlled chemistry | Once-through condenser tubes & seawater cooling circuits |
| Naval & Defense Applications | Secondary piping, corrosion-resistant auxiliaries | Warship seawater systems, high-reliability circuits |
| HVAC & District Cooling (Marine Zones) | Chilled water piping near coastal installations | Seawater-cooled chillers & district cooling intakes |
| Petrochemical & Chemical Plants | Non-oxidizing, mildly corrosive fluids | Aggressive chloride-bearing process fluids |
| Water Treatment & Intake Systems | Raw water transfer, low erosion risk | High-flow intake screens & discharge headers |
Standard Copper Nickel 95/5 (CuNi 95/5) / 66-30-2-2 Alloy Pipes & Tubes Dimensional Chart
| Standard Copper Nickel 95/5 (CuNi 95/5) / 66-30-2-2 Alloy Pipes & Tubes – Dimensional & Theoretical Weight Chart | ||||||
|---|---|---|---|---|---|---|
| Nominal Size | Outside Diameter (OD) (mm) | Wall Thickness (WT) (mm) | Inside Diameter (ID) (mm) | Theoretical Weight (kg/m) | Theoretical Weight (lb/ft) | Typical Supply Form |
| 1/2" | 12.70 | 1.00 | 10.70 | 0.327 | 0.220 | Straight / Coil (as feasible) |
| 1/2" | 12.70 | 1.20 | 10.30 | 0.388 | 0.260 | Straight / Coil (as feasible) |
| 1/2" | 12.70 | 1.50 | 9.70 | 0.475 | 0.319 | Straight / Coil (as feasible) |
| 3/4" | 19.05 | 1.00 | 17.05 | 0.498 | 0.335 | Straight |
| 3/4" | 19.05 | 1.20 | 16.65 | 0.594 | 0.399 | Straight |
| 3/4" | 19.05 | 1.50 | 16.05 | 0.734 | 0.493 | Straight |
| 1" | 25.40 | 1.00 | 23.40 | 0.669 | 0.449 | Straight |
| 1" | 25.40 | 1.20 | 23.00 | 0.801 | 0.538 | Straight |
| 1" | 25.40 | 1.50 | 22.40 | 0.993 | 0.667 | Straight |
| 1-1/4" | 31.75 | 1.20 | 29.35 | 1.008 | 0.677 | Straight |
| 1-1/4" | 31.75 | 1.50 | 28.75 | 1.253 | 0.842 | Straight |
| 1-1/4" | 31.75 | 2.00 | 27.75 | 1.650 | 1.109 | Straight |
| 1-1/2" | 38.10 | 1.20 | 35.70 | 1.211 | 0.814 | Straight |
| 1-1/2" | 38.10 | 1.50 | 35.10 | 1.513 | 1.017 | Straight |
| 1-1/2" | 38.10 | 2.00 | 34.10 | 2.008 | 1.350 | Straight |
| 2" | 50.80 | 1.20 | 48.40 | 1.622 | 1.090 | Straight |
| 2" | 50.80 | 1.50 | 47.80 | 2.037 | 1.369 | Straight |
| 2" | 50.80 | 2.00 | 46.80 | 2.722 | 1.829 | Straight |
| 2-1/2" | 63.50 | 1.50 | 60.50 | 2.555 | 1.717 | Straight |
| 2-1/2" | 63.50 | 2.00 | 59.50 | 3.420 | 2.297 | Straight |
| 2-1/2" | 63.50 | 2.50 | 58.50 | 4.270 | 2.869 | Straight |
| 3" | 76.20 | 1.50 | 73.20 | 3.081 | 2.070 | Straight |
| 3" | 76.20 | 2.00 | 72.20 | 4.138 | 2.780 | Straight |
| 3" | 76.20 | 2.50 | 71.20 | 5.184 | 3.483 | Straight |
| 4" | 101.60 | 2.00 | 97.60 | 5.555 | 3.733 | Straight |
| 4" | 101.60 | 2.50 | 96.60 | 6.952 | 4.672 | Straight |
| 4" | 101.60 | 3.00 | 95.60 | 8.337 | 5.603 | Straight |
Note: All weights are theoretical for estimation only (Cu-Ni density typically ~8.94 g/cm³). Actual supplied weight may vary with tolerance, ovality, and finishing. Confirm project-critical take-off with MTC/inspection.
