GNEE's hot-rolled copper-nickel alloy tubing is designed for projects with performance requirements far exceeding those of ordinary metals-renowned for its durability and reliability. These tubings are manufactured using 90/10 (C70600) and 70/30 (C71500) alloys, combining robust structural performance with superior resistance to seawater corrosion.
GNEE's copper-nickel alloy tubing is designed to withstand the world's most demanding environments, making it the material of choice for heavy-duty marine structures, heat exchanger shells, desalination plants, and offshore platforms. Each sheet undergoes rigorous rolling, heat treatment, and precision finishing to ensure consistent thickness, excellent weldability, and predictable batch-to-batch processing performance.
Chemical Composition
The following table shows the typical chemical composition of Cupronickel Hot-Rolled Plates in 90/10 (C70600) and 70/30 (C71500) grades as per ASTM and international specifications.
| Element | 90/10 CuNi (C70600) | 70/30 CuNi (C71500) |
|---|---|---|
| Copper (Cu) | 86.0 – 90.0% | 65.0 – 70.0% |
| Nickel (incl. Cobalt) | 9.0 – 11.0% | 29.0 – 33.0% |
| Iron (Fe) | 1.0 – 1.8% | 0.4 – 1.0% |
| Manganese (Mn) | ≤ 1.0% | ≤ 1.0% |
| Lead (Pb) | ≤ 0.02% | ≤ 0.02% |
| Zinc (Zn) | ≤ 0.5% | ≤ 0.5% |
| Others (each) | ≤ 0.05% | ≤ 0.05% |
| Balance | Copper | Copper |
Mechanical, Physical & Fabrication Properties
The following table summarizes the typical mechanical, physical, and fabrication characteristics of Cupronickel Hot-Rolled Plates in both 90/10 (C70600) and 70/30 (C71500) grades. These values serve as a guide for material selection in marine, offshore, power generation, and process industry applications.
| Property | Unit | 90/10 CuNi (C70600) | 70/30 CuNi (C71500) |
|---|---|---|---|
| Tensile Strength | MPa (ksi) | 300–360 (44–52) | 370–420 (54–61) |
| Yield Strength (0.2% Proof) | MPa (ksi) | 105–150 (15–22) | 125–250 (18–36) |
| Elongation | % | 30–40 | 25–35 |
| Hardness | HV | 80–120 | 100–150 |
| Modulus of Elasticity | GPa | 130–140 | 140–150 |
| Physical Properties | |||
| Density | g/cm³ | 8.9 | 8.9 |
| Melting Point (approx.) | °C | 1100–1140 | 1180–1200 |
| Electrical Conductivity | % IACS | 10 | 6 |
| Thermal Conductivity | W/m·K | 50 | 29 |
| Coefficient of Thermal Expansion | 10⁻⁶ /°C | 17.1 | 16.5 |
| Fabrication Properties | |||
| Machinability Rating (Free Cutting Brass = 100) | – | 20 | 15 |
| Hot Working Temperature Range | °C | 760–870 | 850–950 |
| Cold Working | – | Good | Moderate |
| Weldability | – | Excellent (TIG, MIG, brazing) | Excellent (TIG, MIG, brazing) |
| Brazing / Soldering | – | Good | Good |
| Annealing Temperature | °C | 650–750 | 700–800 |
Applications
GNEE's copper-nickel alloy hot-rolled tubes are widely used in shipbuilding, offshore, power generation, and desalination projects, where extremely high strength, weldability, and seawater corrosion resistance are required.
• Hull and deck plates for ship and offshore structures
• Condenser shells, pressure vessel panels, and heat exchanger shells
• Structural plates for seawater platforms and supports
• Large components: flanges, weldable shells, and heavy-duty marine fittings
• Plate assemblies and seawater pressure shells for desalination plants
• Piping for construction and heavy-duty marine applications requiring high rigidity and corrosion resistance
Standards & International Equivalents:
| Standard / Specification | 90/10 Cupronickel (C70600) | 70/30 Cupronickel (C71500) |
|---|---|---|
| UNS Designation | C70600 | C71500 |
| ASTM / ASME | ASTM B122 / ASME SB122 ASTM B171 / ASME SB171 |
ASTM B122 / ASME SB122 ASTM B171 / ASME SB171 |
| EN / DIN | CW352H / CuNi10Fe1Mn (EN 1652, EN 1653) | CW354H / CuNi30Mn1Fe (EN 1652, EN 1653) |
| BS (British Standard) | CN102 | CN107 |
| ISO | Cu-Ni10Fe1Mn | Cu-Ni30Mn1Fe |
| JIS (Japanese) | C7060T (JIS H3300) | C7150T (JIS H3300) |
| Military Specification | MIL-C-15726 | MIL-C-15726 |
| Indian Standard (IS) | IS 4408 – Cupronickel 90/10 Plates, Sheets & Strips | IS 4408 – Cupronickel 70/30 Plates, Sheets & Strips |
Common Names & International Identifiers
| Type | 90/10 Cupronickel (C70600) | 70/30 Cupronickel (C71500) |
|---|---|---|
| Common Trade Names | Cupronickel 90/10, Copper-Nickel Alloy 706, CuNi10Fe1Mn | Cupronickel 70/30, Copper-Nickel Alloy 715, CuNi30Mn1Fe |
| CDA / UNS Designation | CDA 706 / UNS C70600 | CDA 715 / UNS C71500 |
| EN / DIN Equivalent | CW352H (EN 1652) / CuNi10Fe1Mn | CW354H (EN 1652) / CuNi30Mn1Fe |
| BS Equivalent | CN102 | CN107 |
| ISO Equivalent | CuNi10Fe1Mn | CuNi30Mn1Fe |
| JIS Equivalent | C7060T (JIS H3300) | C7150T (JIS H3300) |
Our spot inventory
| ASME SB111 C71500 |
C71500 seamless condenser tube |
C71500 welded copper nickel pipe |
| ASTM B111 C71500 |
ASTM B466 C71500 pipe |
C71500 cupronickel boiler tube |
| 70/30 copper nickel pipe |
C71500 heat exchanger tube |
C71500 welded copper nickel pipe |
| SB111 UNS C71500 |
70/30 cupronickel condenser tube |
ASTM B111 C71500 heat exchanger tube |
|
C71500 copper nickel pipe |
ASTM B111 C71500 heat exchanger tube |
ASME SB111 C71500 copper nickel pipe |
About us
Gnee is a premier manufacturer and international supplier of comprehensive copper and copper alloy products, committed to delivering excellence in copper tubes, copper sheets, copper plates, copper bars, copper rods, copper wires, and copper strips.
Our Extensive Product Portfolio & Specifications:
Copper Tubes & Pipes:
We supply a full range including **Capillary Tubes, Thin-Walled Copper Tubes, Thick-Walled Copper Tubes, Round Pipes, Square Pipes, Rectangular Pipes, Welded Pipes, Seamless Pipes, Heat Exchanger Tubes, and Condenser Tubes.
Copper Sheets, Plates:
Our flat-rolled products cover Copper Foils, Thin Sheets, Thick Plates, and Circles (Round Plates) in various tempers (O, H) for diverse applications.
Copper Bars, Rods & Profiles:
We offer Round Bars, Square Bars, Hexagonal Bars, and Flat Bars with excellent machinability and strength.
Copper Wires & Strips:
Our lineup includes high-conductivity Bare Copper Wires, Stranded Wires, and precisely manufactured Copper Strips.
Common Alloys & International Standards:
We master a wide array of materials compliant with ASTM, EN, JIS, and GB standards:
Pure Copper: C11000 (ETP Copper), C10200 (Oxygen-Free Copper), C12000 (DLP)
Brass Alloys: C26000 (Cartridge Brass), C27200 (Brass), C28000 (Muntz Metal)
Copper-Nickel: C70600 (CuNi90/10), C71500 (CuNi70/30)
Phosphor Bronze: C51900, C52100, C54400
Serving industries from HVAC/R and plumbing to electrical, automotive, and marine engineering, Gnee provides OEM support, competitive pricing, and reliable bulk supply for your global projects.
