Copper Nickel Pipes & Tubes (90/10 & 70/30) | UNS C70600 / C71500
Our Products
Our Brochure
Copper Nickel Pipes & Tubes (90/10 & 70/30) | UNS C70600 / C71500 Brochure
Download
Descriptions
Navkar Metal Syndicate supplies premium Cupronickel Pipes & Tubes in 90/10 (UNS C70600) and 70/30 (UNS C71500) grades, engineered for long service life in seawater and chloride-bearing industrial systems.
Our CuNi tubing combines superior seawater corrosion resistance, natural anti-fouling behaviour and excellent weldability — ensuring reduced maintenance costs and extended uptime for condensers, heat exchangers, seawater intakes, shipboard systems and offshore installations.
UNS C70600 (90/10) is ideal for cost-efficient seawater service, while UNS C71500 (70/30) provides enhanced strength and erosion resistance for demanding marine environments.
Every batch supplied by Navkar Metal Syndicate undergoes strict quality control, ships with Mill Test Certificates (MTCs), traceable heat numbers, and export-grade seaworthy packing. We also provide custom cut-to-length supply, application-specific technical guidance, and global logistics support for turnkey industrial and marine projects.
Chemical Composition
The chemical composition of Cupronickel Pipes & Tubes supplied by Navkar Metal Syndicate conforms to international standards such as ASTM B111 / B466 for UNS C70600 (90/10) and UNS C71500 (70/30). These alloys offer excellent resistance to seawater corrosion, stress cracking, and biofouling.
| Element | UNS C70600 (90/10 Cu-Ni) | UNS C71500 (70/30 Cu-Ni) |
|---|---|---|
| Copper (Cu) | 88.6 – 90.0 % | 69.0 – 71.0 % |
| Nickel + Cobalt (Ni + Co) | 9.0 – 11.0 % | 29.0 – 33.0 % |
| Iron (Fe) | 1.0 – 1.8 % | 0.4 – 1.0 % |
| Manganese (Mn) | 1.0 max | 1.0 max |
| Lead (Pb) | 0.02 max | 0.02 max |
| Zinc (Zn) | 0.5 max | 1.0 max |
| Carbon (C) | 0.05 max | 0.05 max |
| Others (each) | 0.02 max | 0.02 max |
| Total Impurities | 0.3 max | 0.3 max |
Note: The composition values comply with ASTM, ASME, and relevant international specifications for marine-grade Copper Nickel Alloys.
Mechanical, Physical & Fabrication Properties
Navkar Metal Syndicate supplies premium Copper Nickel Pipes & Tubes in UNS C70600 (90/10) and UNS C71500 (70/30) compositions, conforming to ASTM B111 / ASME SB111 / B466 standards. These alloys are renowned for seawater corrosion resistance, strength, ductility, and excellent fabrication & welding characteristics—making them ideal for condensers, heat exchangers, and marine piping systems.
UNS C70600 (90/10 Cu-Ni) – Pipes & Tubes
Mechanical Properties
| Property / Temper | Annealed (Soft) | As-Drawn / Cold-Worked | Hard-Drawn / High Hardness |
|---|---|---|---|
| Tensile Strength (UTS) | 300 – 360 MPa (44 – 52 ksi) | 345 – 485 MPa (50 – 70 ksi) | 420 – 520 MPa (61 – 75 ksi) |
| 0.2% Proof / Yield Strength | 100 – 160 MPa (15 – 23 ksi) | 200 – 350 MPa (29 – 51 ksi) | 300 – 400 MPa (typ.) |
| Elongation (%) | 30 – 42 % | 20 – 35 % | 10 – 20 % |
| Hardness (HV) | 85 – 110 | 110 – 200 | 150 + |
| Modulus of Elasticity | 130 – 140 GPa | ||
Physical Properties
| Property | Value |
|---|---|
| Density | 8.9 g/cm³ |
| Melting Range (°C) | 1090 – 1145 °C |
| Thermal Conductivity (W/m·K) | 50 – 60 |
| Electrical Conductivity (% IACS) | 10 – 15 % |
| Coefficient of Thermal Expansion (20–300 °C) | 17.1 × 10-6/°C |
| Specific Heat | 377 J/kg·K |
Fabrication Properties
| Process | Property / Performance |
|---|---|
| Cold Workability | Excellent – easily drawn, bent, and expanded |
| Hot Formability Range | 800 – 950 °C |
| Machinability Rating (Free-Cutting Brass = 100) | 25 % |
| Weldability / Brazing / Soldering | Excellent – suitable for GTAW, GMAW, brazing and soft soldering |
| Stress Relief Temperature | 250 – 350 °C |
UNS C71500 (70/30 Cu-Ni) – Pipes & Tubes
Mechanical Properties
| Property / Temper | Annealed (Soft) | As-Drawn | Hard / Cold-Worked |
|---|---|---|---|
| Tensile Strength (UTS) | 370 – 420 MPa (54 – 61 ksi) | 420 – 520 MPa (61 – 75 ksi) | 520 + MPa (typ.) |
| 0.2% Proof / Yield Strength | 120 – 250 MPa (17 – 36 ksi) | 220 – 380 MPa | 300 + MPa |
| Elongation (%) | 30 – 45 % | 20 – 35 % | 10 – 25 % |
| Hardness (HV) | 95 – 140 | 130 – 220 | 160 + |
| Modulus of Elasticity | 140 – 150 GPa | ||
Physical Properties
| Property | Value |
|---|---|
| Density | 8.9 g/cm³ |
| Melting Range (°C) | 1170 – 1240 °C |
| Thermal Conductivity (W/m·K) | 29 – 35 |
| Electrical Conductivity (% IACS) | 4 – 6 % |
| Coefficient of Thermal Expansion (20–300 °C) | 16.7 × 10-6/°C |
| Specific Heat | 377 J/kg·K |
Fabrication Properties
| Process | Property / Performance |
|---|---|
| Cold Workability | Good – moderate forming capability |
| Hot Formability Range | 850 – 975 °C |
| Machinability Rating (Free-Cutting Brass = 100) | 20 % |
| Weldability / Brazing / Soldering | Excellent – suitable for all conventional methods (GTAW, GMAW, brazing) |
| Stress Relief Temperature | 250 – 350 °C |
Note: Values shown are typical averages from tested mill lots of seamless and welded Cu-Ni Pipes & Tubes. For design or certification, refer to ASTM B111 / ASME SB111 or equivalent standards.
Applications
Navkar Metal Syndicate supplies Copper Nickel Pipes & Tubes (UNS C70600 & C71500) to industries that demand exceptional resistance to seawater, high mechanical integrity, and long service life. Our Cu-Ni tubing is trusted worldwide in marine, offshore, power, and process industries.
- Marine Engineering & Shipbuilding – seawater piping, ballast systems, and shipboard cooling lines.
- Desalination Plants – evaporator tubing, brine heaters, and salt-water handling pipelines.
- Power Generation – cooling water systems, condensers, and heat exchanger tubes.
- Offshore Oil & Gas Platforms – firewater systems, riser pipes, and subsea equipment.
- Hydraulic Lines & Condenser Tubes – high-pressure, corrosion-resistant fluid transport lines.
- Chemical & Petrochemical Processing – acid-resistant tubing and seawater cooling networks.
Designed for performance in seawater and brine service, these Cu-Ni alloys deliver long-term reliability, reduced maintenance, and excellent weldability in demanding marine, power, and process environments.
Standards & International Equivalents:
Navkar Metal Syndicate supplies Copper Nickel Pipes & Tubes that conform to globally recognized standards for quality, strength, and corrosion resistance. Our products meet or exceed the requirements of ASTM, ASME, EN, DIN, BS, and ISO specifications.
| Grade / Alloy | UNS No. | ASTM / ASME | EN / DIN | BS (British) | ISO / Others |
|---|---|---|---|---|---|
| Copper Nickel 90/10 | C70600 | B111 / SB111, B466 / SB466 | CuNi10Fe1Mn / CW352H (DIN 2.0872) | CN102, NES 780 | ISO 16330 CuNi10Fe1Mn |
| Copper Nickel 70/30 | C71500 | B111 / SB111, B466 / SB466 | CuNi30Mn1Fe / CW354H (DIN 2.0882) | CN107, NES 781 | ISO 16330 CuNi30Mn1Fe |
Note: All Cu-Ni Pipes & Tubes are supplied with full Mill Test Certificates (EN 10204 3.1), clearly indicating heat number, chemical composition, and mechanical test results. Custom specifications and equivalent grades can be supplied upon request.
Common Names & International Identifiers
Copper Nickel Alloys are widely known under various trade names and specifications across international markets. The following list summarizes the most recognized identifiers for both 90/10 (C70600) and 70/30 (C71500) grades.
| Alloy Type | UNS / CDA No. | Common / Trade Names | EN / DIN Equivalents | Other Identifiers |
|---|---|---|---|---|
| 90/10 Copper Nickel | C70600 / CDA 706 | 90-10 Cupronickel, Cupro Nickel 90/10, CuNi10Fe1Mn | EN CW352H / DIN 2.0872 | CN102, NES 780, ISO CuNi10Fe1Mn |
| 70/30 Copper Nickel | C71500 / CDA 715 | 70-30 Cupronickel, Cupro Nickel 70/30, CuNi30Mn1Fe | EN CW354H / DIN 2.0882 | CN107, NES 781, ISO CuNi30Mn1Fe |
These identifiers are commonly used across the marine, power, offshore, and process industries to specify material grade, ensuring compatibility with international standards such as ASTM B111 / ASME SB111 and EN 12451.
Common Product Forms & Dimensions
Below is the standard dimensional chart for Copper Nickel Pipes (90/10 & 70/30) showing outside diameter (OD), wall thickness, and theoretical weight per foot and per meter. All dimensions conform to ASTM B111 / ASME SB111 specifications.
| Nominal Size (inch) | Outside Diameter (OD) | Wall Thickness | Theoretical Weight | |||
|---|---|---|---|---|---|---|
| inch | mm | inch | mm | lb/ft | kg/m | |
| 1/8 | 0.405 | 10.29 | 0.049 | 1.24 | 0.19 | 0.28 |
| 1/4 | 0.540 | 13.72 | 0.065 | 1.65 | 0.33 | 0.49 |
| 3/8 | 0.675 | 17.15 | 0.065 | 1.65 | 0.42 | 0.63 |
| 1/2 | 0.840 | 21.34 | 0.083 | 2.11 | 0.67 | 1.00 |
| 3/4 | 1.050 | 26.67 | 0.083 | 2.11 | 0.86 | 1.28 |
| 1 | 1.315 | 33.40 | 0.109 | 2.77 | 1.40 | 2.09 |
| 1-1/4 | 1.660 | 42.16 | 0.109 | 2.77 | 1.81 | 2.70 |
| 1-1/2 | 1.900 | 48.27 | 0.109 | 2.77 | 2.09 | 3.11 |
| 2 | 2.375 | 60.32 | 0.109 | 2.77 | 2.64 | 3.93 |
| 2-1/2 | 2.875 | 73.03 | 0.120 | 3.05 | 3.53 | 5.26 |
| 3 | 3.500 | 88.90 | 0.120 | 3.05 | 4.33 | 6.45 |
| 3-1/2 | 4.000 | 101.60 | 0.120 | 3.05 | 4.97 | 7.40 |
| 4 | 4.500 | 114.30 | 0.120 | 3.05 | 5.61 | 8.36 |
| 5 | 5.563 | 141.30 | 0.134 | 3.40 | 7.77 | 11.57 |
| 6 | 6.625 | 168.30 | 0.134 | 3.40 | 9.29 | 13.84 |
| 8 | 8.625 | 219.10 | 0.148 | 3.76 | 13.40 | 19.96 |
| 10 | 10.750 | 273.05 | 0.165 | 4.19 | 18.65 | 27.78 |
| 12 | 12.750 | 323.90 | 0.180 | 4.57 | 24.17 | 36.00 |
Note: Custom diameters, wall thicknesses, and coil forms can be manufactured on request. All Cu-Ni pipes are supplied with MTC (EN 10204 3.1), traceable heat numbers, and export seaworthy packaging.
Tell Us What You Need
30+
Years of Experience
Trusted Worldwide | Supplying Copper & Alloys to 1000+ clients
We usually respond within 24 working hours.