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Industrial Copper-Nickel Tubing
Copper-nickel alloy tubes (commonly available in 90/10 and 70/30 grades) are α-single-phase solid-solution copper alloys that are resistant to seawater and chloride corrosion. They offer excellent resistance to pitting, crevice, and erosion corrosion, as well as resistance to marine biofouling. With good thermal conductivity and ease of welding and bending, they are widely used in ship cooling systems, heat exchangers, seawater desalination, and petrochemical piping. The products comply with the ASTM B111 standard and are available in a variety of specifications, including U-bends.
Core Industrial Advantages
I. Exceptional Corrosion Resistance
It forms a self-healing protective film in situ in seawater and chloride-containing media, effectively resisting uniform corrosion, pitting corrosion, crevice corrosion, and stress corrosion cracking, and is suitable for harsh industrial environments with high flow rates and high salt fog exposure.
II. Resistance to Biofouling and Erosion
It naturally inhibits marine biofouling, reducing pipeline blockages and maintenance frequency; at the same time, it withstands high-velocity erosion, making it particularly suitable for dynamic operating conditions such as condensers and cooling systems.
III. Excellent Processing and Joining Properties
It possesses good cold and hot forming properties, is easy to bend, weld, and braze, and can be fabricated into complex shapes such as U-bends and coiled tubes to meet the diverse installation requirements of industrial equipment.
IV. Combines Thermal Conductivity with Long Service Life
Retains the high thermal conductivity of the copper matrix to ensure efficient heat transfer; with a long design life (up to 30 years or more in seawater environments), it significantly enhances the reliability and operational continuity of industrial equipment.
1. General Information & Standards
|
Parameter |
Details |
|
Product Type |
Seamless Copper-Nickel Alloy Tube / Pipe |
|
Applicable Standards |
ASTM B111 / ASME SB111, ASTM B466, ASTM B359, GB/T 8890, JIS H3300, BS EN 12451, DIN 17664-1-21-11 |
|
Common Grades |
UNS C70600 (90/10 Copper-Nickel), UNS C71500 (70/30 Copper-Nickel)- |
|
Equivalent Grades |
China: BFe10-1-1 (C70600), BFe30-1-1 (C71500)-1 |
2. Chemical Composition (%)
|
Element |
UNS C70600 (90/10) |
UNS C71500 (70/30) |
|
Copper (Cu) |
Remainder (min. 88.6%)- |
Remainder-36 |
|
Nickel (Ni) |
9.0 – 11.0-11 |
29.0 – 33.0-27 |
|
Iron (Fe) |
1.0 – 1.8-27 |
0.40 – 1.0-27 |
|
Manganese (Mn) |
≤ 1.0-11 |
≤ 1.0-27 |
|
Zinc (Zn) |
≤ 1.0-11 |
≤ 1.0-27 |
|
Lead (Pb) |
≤ 0.05-11 |
≤ 0.05-27 |
3. Mechanical Properties (Depending on Temper)
|
Property |
UNS C70600 (90/10) |
UNS C71500 (70/30) |
|
Tensile Strength, Ultimate |
290 – 570 MPa-36 |
380 – 620 MPa-36 |
|
Tensile Strength (Annealed) |
≥ 303 MPa (44 ksi)-11 |
≥ 380 MPa |
|
Yield Strength (Annealed) |
≥ 110 MPa (16 ksi)-11 |
≥ 130 MPa |
|
Yield Strength (H55 Temper) |
≥ 393 MPa (57 ksi)-11 |
— |
|
Elongation (Annealed) |
≥ 42% (in 254 mm)-11 |
≥ 15% (in 50 mm) |
|
Elongation (H55 Temper) |
≥ 10%-11 |
— |
|
Elastic Modulus |
120 GPa-36 |
140 GPa-36 |
|
Poisson's Ratio |
0.34-36 |
0.33-36 |
|
Shear Modulus |
46 GPa-36 |
52 GPa-36 |
|
Hardness (Annealed) |
Rockwell B 15-11 |
— |
|
Hardness (H55 Temper) |
Rockwell B 72-11 |
— |
4. Physical Properties
|
Property |
UNS C70600 (90/10) |
UNS C71500 (70/30) |
|
Density |
8.9 g/cm³-36 |
8.9 g/cm³-36 |
|
Melting Point (Solidus) |
1100 °C-36 |
1170 °C-36 |
|
Melting Point (Liquidus) |
1150 °C-36 |
1240 °C-36 |
|
Specific Heat Capacity |
390 J/kg`K-36 |
400 J/kg`K-36 |
|
Thermal Conductivity |
~44 W/m`K-36- |
~28 W/m`K-36- |
|
Coefficient of Thermal Expansion |
17 µm/m`K-36 |
16 µm/m`K-36 |
|
Electrical Conductivity |
9.8 % IACS-36 |
4.6 % IACS-36 |
|
Electrical Resistivity |
0.34 Ω`mm²/m- |
— |
5. Dimensions & Tolerances
|
Parameter |
Range / Details |
|
Outside Diameter (OD) |
5 – 419 mm-1- (Typical: 6.35 – 152.4 mm) |
|
Wall Thickness (WT) |
0.5 – 10 mm-1- |
|
Length |
Customized as per buyer's requirements-1 |
|
OD Tolerance (OD ≤ 50 mm) |
±0.05 mm |
|
OD Tolerance (OD > 50 mm) |
±0.1 mm |
|
Wall Thickness Tolerance |
Per ASTM B111 Table 11 / 12 |
|
Straightness |
Good straightness, with clean surface inside and outside-1 |
6. Fabrication Properties
|
Joining Technique |
UNS C70600 (90/10) |
UNS C71500 (70/30) |
|
Soldering |
Excellent-27 |
Excellent-27 |
|
Brazing |
Excellent-27 |
Excellent-27 |
|
Oxyacetylene Welding |
Fair-27 |
Good-27 |
|
Gas Shielded Arc Welding |
Excellent-27 |
Excellent-27 |
|
Coated Metal Arc Welding |
Good-27 |
Excellent-27 |
|
Spot Weld |
Good-27 |
Excellent-27 |
|
Seam Weld |
Good-27 |
Excellent-27 |
|
Butt Weld |
Excellent-27 |
Excellent-27 |
|
Cold Working Capacity |
Good-27 |
Good-27 |
|
Hot Forming Capacity |
Good-27 |
Good-27 |
|
Machinability Rating |
20 (ASTM)-27 |
20 (ASTM)-27 |
7. Tempers / Supply Condition
|
Temper |
Description |
|
O61 |
Annealed (Soft)- |
|
H55 |
Drawn and stress-relieved-11 |
|
H80 |
Hard Drawn- |
|
Custom |
Other tempers available upon request-1 |
8. Applications
|
Industry |
Typical Uses |
|
Marine & Offshore |
Seawater piping systems, shipbuilding, offshore platforms, underwater tubing-27 |
|
Power Generation |
Surface condensers, turbine oil coolers, gland steam condensers-1- |
|
Heat Exchangers |
Condensers, evaporators, boilers, air coolers-1- |
|
Desalination |
|
|
Oil & Gas |
Fuel oil heaters, compressed air inter/after coolers-1 |
|
General Industrial |
Ferrules, oil well pump liners, fire sprinkler systems, refrigeration-1-21 |
9. Pressure Ratings
|
Grade |
Condition |
Max. Working Pressure |
|
C71500 |
Annealed (O) |
500 psi @ 100°F (3.45 MPa)- |
|
C71500 |
Hard Drawn (H80) |
500 psi @ 100°F (3.45 MPa)- |
|
C70600 |
High-Pressure Application |
Engineered for high-pressure services |
Shipbuilding and Ocean Engineering
Electric Power and Energy Industry
Seawater Desalination and Water Treatment
Petrochemicals and Process Industries
We provide full-lifecycle technical support covering material selection, welding, installation, and maintenance, including corrosion analysis, welding process recommendations, and design optimization consulting, to help customers mitigate project risks.
We support on‑demand customization of outer diameter, wall thickness, length, and surface treatment. We offer a full range of processing services, including bending, U‑bends, coiling, cutting, and welding, to meet both cut‑to‑length retail and bulk purchase needs.
Each batch is accompanied by a complete Material Test Certificate (MTC), ensuring full traceability throughout the process. We comply with international standards such as ASTM B111 and ASME SB111, and support classification society certification and third‑party testing.
We maintain a stock of standard specifications in our domestic and international warehouses and implement a proactive inventory preparation mechanism to effectively shorten delivery lead times and ensure rapid response to urgent orders.
We provide technical installation guidance and rapid after‑sales response. For product quality issues, we are responsible for returns, replacements, or compensation in accordance with the contract. Some suppliers also offer supplementary support such as sample tubes and engineering consulting.
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