Table of Contents
- UNS C70600 & UNS C71500 Round Bars Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- UNS C70600 vs UNS C71500: Key Differences
- Types of Copper Nickel Round Bars
- Key Advantages of UNS C70600 & C71500 Round Bars
- Key Applications of Copper Nickel Round Bars
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
UNS C70600 / UNS C71500 Round Bars Supplier & Exporter
Aurum Overseas is a leading UNS C70600 Round Bars Supplier and UNS C71500 Round Bars Supplier stocking ready-to-ship Copper Nickel 90/10 / 70/30 Round Bars. Built for extreme marine and saltwater environments, our cupronickel bars stop biofouling and fluid erosion without requiring protective coatings—reducing maintenance and preventing costly corrosion shutdowns.
As a trusted UNS C70600 Round Bars Exporter and UNS C71500 Round Bars Exporter, we stock precision-drawn Copper Nickel Bright Bars for close-tolerance machining and heavy Copper Nickel Forged Bars for high thermal and pressure loads. All stock complies with ASTM B151, MIL-C-15726, and DIN standards, complete with EN 10204 3.1 Mill Test Certificates.
We deliver certified Copper Nickel 90/10 / 70/30 Round Bars worldwide with rapid dispatch to key industrial hubs across North America, Europe, the Middle East, and Asia-Pacific, including the USA, Germany, UAE, Saudi Arabia, Singapore, and Australia.
Technical Specifications
| Technical Parameter | Copper Nickel 90/10 (UNS C70600) | Copper Nickel 70/30 (UNS C71500) |
|---|---|---|
| Material Designation | CuNi 90/10 / Cupro Nickel 10% | CuNi 70/30 / Cupro Nickel 30% |
| UNS Number | UNS C70600 | UNS C71500 |
| Werkstoff Number | 2.0872 | 2.0882 |
| Manufacturing Standards | ASTM B151, ASME SB151, MIL-C-15726, BS 2874 | ASTM B151, ASME SB151, MIL-C-15726, BS 2874 |
| Diameter Range | 5 mm to 350 mm (1/4" to 14") | 5 mm to 350 mm (1/4" to 14") |
| Length Options | 1 to 6 Meters, Custom Cut-to-Length | 1 to 6 Meters, Custom Cut-to-Length |
| Dimensional Tolerances | ISO h8, h9, h10, h11, ASTM B151 standards | ISO h8, h9, h10, h11, ASTM B151 standards |
| Delivery Conditions | Annealed (O60), Light Drawn (H55), Hard Drawn (H80) | Annealed (O60), Light Drawn (H55), Hard Drawn (H80) |
Chemical Composition & Mechanical Properties
Equivalent Grades
| Grade | Werkstoff Nr. | UNS | EN Standard | BS Standard |
|---|---|---|---|---|
| Cupro Nickel 90/10 | 2.0872 | C70600 | CuNi10Fe1Mn | CN102 |
| Cupro Nickel 70/30 | 2.0882 | C71500 | CuNi30Mn1Fe | CN106 |
Chemical Composition of Copper Nickel Round Bars
| Chemical Element | UNS C70600 | UNS C71500 |
|---|---|---|
| Copper (Cu) | 88.6 min | Balance (approx. 65.0 min) |
| Nickel (Ni) | 9.0 – 11.0 max | 29.0 – 33.0 |
| Iron (Fe) | 1.0 – 1.8 max | 0.4 – 1.0 |
| Manganese (Mn) | 1.0 max | 1.0 max |
| Zinc (Zn) | 1.0 max | 1.0 max |
| Lead (Pb) | 0.05 max | 0.02 max |
Mechanical Properties of Copper Nickel Round Bars
| Property / Parameter | UNS C70600 | UNS C71500 |
|---|---|---|
| Tensile Strength | 50,000 PSI (345 MPa) | 65,000 PSI (450 MPa) |
| Yield Strength (0.2% Offset) | 20,000 PSI (140 MPa) | 25,000 PSI (170 MPa) |
| Elongation (%) | 30% | 30% |
| Density | 8.89 g/cm³ (0.323 lb/in³) | 8.94 g/cm³ (0.323 lb/in³) |
| Melting Point | 2260°F (1238°C) | 2260°F (1238°C) |
UNS C70600 vs UNS C71500: Key Differences
| Feature | CuNi 90/10 (UNS C70600) | CuNi 70/30 (UNS C71500) |
|---|---|---|
| Composition | 90% Copper, 10% Nickel (with Iron & Manganese additions) | 70% Copper, 30% Nickel |
| Primary Strength | Superior biofouling resistance & high thermal conductivity | Higher mechanical strength & high-velocity fluid resistance |
| Tensile Strength | 50,000 PSI (345 MPa) | 65,000 PSI (450 MPa) |
| Biofouling Defense | Excellent (releases copper ions to prevent barnacles & algae without paint) | Moderate (good corrosion defense, but lower active biofouling resistance) |
| Erosion & Velocity Limits | Resists moderate seawater flow velocities | Superior resistance to severe turbulence, cavitation, and speeds > 3.5 m/s |
| Thermal & Stress Performance | Ideal for standard marine cooling & seawater systems | Best for high-temperature steam condensers & hot brine evaporators |
| Machinability & Formability | High ductility (30% elongation) and easy cold forming | Stronger and harder, built for higher pressure loads |
Types of Copper Nickel Round Bars
Aurum Overseas supplies certified UNS C70600 and UNS C71500 Copper Nickel Round Bars in precision bright and heavy forged conditions for marine and desalination service.
Copper Nickel 90/10 / 70/30 Bright Bars
Copper Nickel 90/10 / 70/30 Forged Bars
Key Advantages of UNS C70600 & C71500 Round Bars
Natural Biofouling Defense
Copper content prevents marine growth like barnacles and algae without needing special coatings.
Resists Fast-Flowing Seawater
Prevents surface erosion and pitting caused by high-velocity marine turbulence.
Zero Saltwater Stress Cracking
Immune to chloride-induced stress cracking in warm, high-salinity water.
Easy Welding & Joining
Easily welded using standard TIG and MIG methods without post-weld heat treatment.
Key Applications of Copper Nickel Round Bars
| Industry Sector | Typical Components | Main Benefit |
|---|---|---|
| Marine & Shipbuilding | Propeller shafts, rudder stocks, and seawater valves | Prevents marine organism buildup without protective paints. |
| Desalination Plants | Brine pumps, evaporator shafts, and heavy flanges | Stops pitting and crevice corrosion in hot, concentrated salt brine. |
| Offshore Oil & Gas | Splash-zone pins, riser clamps, and underwater lines | Resists marine atmospheric corrosion and deepwater pressure. |
| Power Generation | Condenser shafts, intake rods, and heat exchangers | Maintains structural integrity under continuous thermal cycles. |
Quality Testing & Inspection
Every shipment of UNS C70600 Round Bars and UNS C71500 Round Bars supplied by Aurum Overseas undergoes strict verification:
- Chemical Verification via XRF/PMI: Confirms exact copper-to-nickel ratios along with precise iron (Fe) and manganese (Mn) control.
- Mechanical Strength Testing: Validates tensile strength (50,000 to 65,000 PSI), 0.2% yield strength, and 30% elongation limits.
- Ultrasonic Examination: Volumetric scanning per ASTM A388 detects any internal voids, inclusions, or forging discontinuities.
- Dimensional Precision Measurement: Laser micrometers verify strict outer-diameter (OD) tolerances across the entire bar length.
Global Export Markets
As an established UNS C70600 and UNS C71500 Round Bars Exporter, Aurum Overseas supplies fully certified Copper Nickel round bars to global marine, desalination, and offshore engineering centers:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
UNS C70600 (90/10) contains 10% nickel and offers superior biofouling resistance and higher thermal conductivity. UNS C71500 (70/30) contains 30% nickel, providing higher tensile strength (65,000 PSI) and greater resistance to high-velocity fluid erosion.
No. Both grades form a protective cuprous oxide film upon contact with seawater that provides long-term corrosion protection and prevents marine biofouling.
Yes. Precision centerless ground Copper Nickel 90/10 / 70/30 Bright Bars feature h8–h11 tolerances, providing accurate chucking and minimal tool wear during turning.
Our stock complies with ASTM B151, ASME SB151, MIL-C-15726, DIN 17664, and BS 2874 standards.
Contact Aurum Overseas
Aurum Overseas provides fully certified UNS C70600 and UNS C71500 Copper Nickel Round Bars engineered for severe marine and industrial service.
Contact our sales engineering team for stock availability, cut-to-size options, or instant pricing: