Table of Contents
- Copper Nickel 90/10 & 70/30 Square & Hex Bars Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- UNS C70600 (90/10) vs UNS C71500 (70/30)
- Types of Cupro Nickel Bars: Hexagonal & Square Profiles
- Key Advantages of Cupro Nickel 90/10 & 70/30 Bars
- Key Applications of Cupro Nickel 90/10 & 70/30 Bars
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Copper Nickel 90/10 & 70/30 Square & Hex Bars Overview
High-performance marine alloy bars are supplied globally by Aurum Overseas, a premier stockist and exporter. As a trusted Copper Nickel 90/10 Square Bars and Copper Nickel 90/10 Hex Bars Supplier, our stock meets ASTM B151 and MIL-C-15726 standards. Our Cupro Nickel 90/10 Square Bars and Cupro Nickel 90/10 Hex Bars provide natural biofouling resistance for seawater hardware and piping systems.
For high-turbulence fluid environments, Aurum Overseas serves as a reliable Copper Nickel 70/30 Square Bars and 70/30 Hex Bars Supplier. Our Cupro Nickel 70/30 Square Bars and Cupro Nickel 70/30 Hex Bars feature higher nickel content to deliver exceptional resistance to impingement attack and stress corrosion cracking.
Engineered for long service in ship hulls, desalination plants, and offshore cooling loops, our UNS C70600 Square Bars and UNS C71500 Hex Bars deliver superior durability. Contact Aurum Overseas today for fast factory quotes and certified mill test reports.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B151, ASME SB151, MIL-C-15726, DIN 17664, EN 12163, BS 2874 |
| UNS Designations | UNS C70600 (90/10) / UNS C71500 (70/30) |
| Length Options | 1,000 mm to 6,000 mm, Custom Sawing and Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Turned, Hot Rolled, Smooth Finished |
| Temper States | Soft Annealed (O60), Light Drawn (H55), Hard Drawn (H80) |
| Dimensional Tolerances | ASTM B249 / ISO 286-2 (h9, h10, h11 profile tolerances) |
| HSN Code | 74072920 / 74072990 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | Werkstoff Nr. | UNS | EN Standard |
|---|---|---|---|---|
| Copper Nickel 90/10 | ASTM B151 | 2.0872 | C70600 | CuNi10Fe1Mn |
| Copper Nickel 70/30 | ASTM B151 | 2.0882 | C71500 | CuNi30Mn1Fe |
Chemical Composition (%)
| Chemical Element | Cu-Ni 90/10 (UNS C70600) | Copper Nickel 70/30 (UNS C71500) |
|---|---|---|
| Copper (Cu) | 88.6 min | 65.0 min |
| Nickel (Ni) | 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 |
| Zinc (Zn) | 1.0 max | 1.0 max |
| Lead (Pb) | 0.05 max | 0.05 max |
Mechanical & Physical Properties
| Property Parameter | UNS C70600 (CuNi 90/10) | UNS C71500 (CuNi 70/30) |
|---|---|---|
| Density | 0.323 lb/in³ (8.94 g/cm³) | 0.323 lb/in³ (8.94 g/cm³) |
| Melting Point | 2260 °F (1238 °C) | 2260 °F (1238 °C) |
| Tensile Strength (Min) | 50,000 Psi (345 MPa) | 50,000 Psi (345 MPa) |
| Yield Strength (0.2% Offset, Min) | 20,000 Psi (140 MPa) | 20,000 Psi (140 MPa) |
| Elongation (Min) | 30 % | 30 % |
UNS C70600 (90/10) vs UNS C71500 (70/30)
| Feature | UNS C70600 (90/10) | UNS C71500 (70/30) |
|---|---|---|
| Alloy Balance | High Copper matrix with 10% Nickel and 1.4% Iron | Enhanced 30% Nickel matrix with 0.7% Iron |
| Corrosion & Velocity Resistance | Natural anti-biofouling layer; suited for water velocities up to 3.5 m/s | High impingement and cavitation resistance; suited for fluid velocities above 4.5 m/s |
| Temperature Capability | Ideal for ambient seawater and low-pressure cooling lines | Maintains creep and oxidation resistance at elevated temperatures |
| Best Used For | Marine hardware, bio-sheathing, intake hex fittings, and seawater valves | High-pressure marine condensers, salt-evaporator bodies, and offshore hydraulic blocks |
Types of Cupro Nickel Bars: Hexagonal & Square Profiles
Aurum Overseas supplies Copper Nickel 90/10 and 70/30 bars in precision hexagonal and square profiles for marine and desalination applications.
Copper Nickel 90/10 & 70/30 Hex Bars
Copper Nickel 90/10 & 70/30 Square Bars
Key Advantages of Cupro Nickel 90/10 & 70/30 Bars
Natural Marine Life Defense
Copper-rich oxides naturally prevent barnacle, algae, and mussel growth without needing toxic chemical coatings.
High-Flow Erosion Protection
Iron and manganese additions create a tough surface film that stops erosion in turbulent, fast-moving seawater.
Complete Saltwater Rust Protection
Immune to chloride stress corrosion cracking, making both grades far superior to standard stainless steel in brackish waters.
Pre-Shaped Machining Efficiency
Ready-to-machine square and hex profiles cut down shop hours, lower tool wear, and reduce raw material scrap.
Key Applications of Cupro Nickel 90/10 & 70/30 Bars
| Industry | Applications | Operational Benefit |
|---|---|---|
| Marine & Naval Hardware | Valve bodies, pump shafts, sea-chest fasteners | Prevents marine bio-fouling and saltwater pitting without anti-fouling paint. |
| Desalination Plants | Brine heater components, evaporator tie-rods, hex plugs | Resists severe thermal shock and hot brine impingement corrosion. |
| Offshore Oil & Gas | Hydraulic tubing blocks, splash zone clamps, hex fittings | Eliminates chloride stress corrosion cracking in high-humidity salt spray zones. |
| Power Generation | Heat exchanger tie-bars, condenser support rods | Maintains long-term structural reliability under continuous cooling water velocity. |
Quality Testing & Inspection
As a top Copper Nickel 90/10 Square Bars and Copper Nickel 70/30 Hex Bars Supplier, Aurum Overseas conducts rigorous testing on all material batches:
- Positive Material Identification (PMI): 100% XRF spectral analysis verifying Ni, Fe, and Mn elemental bounds per ASTM B151 specifications.
- Mechanical & Hardness Testing: Tensile, yield, elongation, and Rockwell B hardness verification to ensure structural integrity under load.
- Eddy Current & Ultrasonic Testing: Non-destructive testing per ASTM E243 to guarantee freedom from internal inclusions, cracks, or drawing seams.
- Dimensional & Surface Inspection: Precision micrometer measurement confirming strict h9 to h11 profile tolerances and surface defect clearance.
Global Export Markets
As an established Copper Nickel Square & Hex Bar Exporter, Aurum Overseas supplies fully certified ASTM B151 UNS C70600 and UNS C71500 bars to global marine, desalination, offshore, and power generation facilities:
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
CuNi 90/10 (UNS C70600) offers maximum resistance to marine biofouling at a lower cost. CuNi 70/30 (UNS C71500) contains more nickel, offering higher resistance to fluid turbulence, impingement, and elevated temperatures.
No. Copper nickel alloys naturally form a thin, protective surface oxide film in seawater that resists corrosion and prevents marine growth without needing paint or protective plating.
Small controlled additions of iron (Fe) and manganese (Mn) significantly enhance erosion-corrosion resistance, reinforcing the oxide film against high-velocity fluid flow.
Yes. Both UNS C70600 and UNS C71500 feature excellent weldability using TIG, MIG, and shielded metal arc welding (SMAW) processes without requiring pre-heat or post-weld heat treatment.
All shipments are supplied with complete EN 10204 3.1 Mill Test Certificates detailing heat chemistry analysis, mechanical test results, NDT clearances, and specification compliance.
Contact Aurum Overseas
Contact a dedicated Copper Nickel 90/10 Hex Bars and Copper Nickel 70/30 Square Bars Exporter for certified alloy bar stock, custom length cutting, and prompt global shipping.