Table of Contents
- Copper Nickel Fasteners Overview
- Copper Nickel Fasteners Specifications
- What are Copper Nickel Nuts?
- Copper Nickel Fasteners Technical Properties & Composition
- Grade Differentiations: Cu-Ni 90/10 vs. Cu-Ni 70/30
- Why Industries Prefer Copper Nickel Nuts
- Types of Copper Nickel Nuts
- Key Advantages of Copper Nickel Nuts
- Key Applications of Copper Nickel Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Copper Nickel Nuts Suppliers & Exporters
Aurum Overseas is a global Copper Nickel Nuts Supplier and Copper Nickel Nuts Exporter, manufacturing precision cupronickel fasteners designed for marine engineering, offshore oil platforms, seawater desalination plants, and coastal power generation facilities.
Available in both 90/10 and 70/30 formulations, these marine-grade fasteners—frequently designated as UNS C70600 Nuts and UNS C71500 Nuts—provide high thermal conductivity, natural resistance to marine biofouling, and stable anti-galling thread behavior under submerged hydrostatic pressures.
As an international Copper Nickel Nuts Exporter, Aurum Overseas supplies fully certified cupronickel bolting products across major industrial centers throughout North America, Europe, the Middle East, and Asia-Pacific.
Copper Nickel Fasteners Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grades | Cu-Ni 90/10 (C70600) / Cu-Ni 70/30 (C71500) |
| UNS Numbers | UNS C70600 / UNS C71500 |
| Werkstoff Numbers | 2.0872 (90/10) / 2.0882 (70/30) |
| Common Trade Names | Cupro Nickel, Cu-Ni 90/10, Cu-Ni 70/30, 90-10 CuNi, 70-30 CuNi |
| Manufacturing Standards | ASTM B151, ASTM B122, DIN 934, ISO 4032, ANSI/ASME B18.2.2 |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Machined Sizes |
| Thread Standards | ASME B1.1 (UNC, UNF, 8UN Class 2B/3B) & ISO Metric B1.13M |
| Nut Formats | Hex Nuts, Heavy Hex, Square, Nylon Insert Lock, Slotted, Flange, Coupling Nuts |
| Testing Standards | ASTM E8 (Mechanical), PMI Spectroscopy, EN 10204 3.1 |
What are Copper Nickel Nuts?
Copper nickel nuts are specialized non-ferrous fasteners produced from copper-nickel alloys engineered to resist marine biofouling and seawater erosion-corrosion.
Available primarily as Copper Nickel 90/10 Nuts and Copper Nickel 70/30 Nuts, these components form a self-repairing cuprous oxide film in flowing seawater. This barrier prevents barnacle growth, macro-fouling, and crevice corrosion across marine heat exchangers, submerged hull fittings, and offshore piping flanges.
Copper Nickel Fasteners Technical Properties & Composition
Chemical Composition of Cu-Ni 90/10 & 70/30 (%)
| Element | Cu-Ni 90/10 (UNS C70600) | Cu-Ni 70/30 (UNS C71500) |
|---|---|---|
| Copper (Cu) | 88.6 min | 88.6 min |
| Nickel (Ni) | 9.0 – 11.0 | 9.0 – 11.0 max |
| Iron (Fe) | 1.8 max | 1.8 max |
| Manganese (Mn) | 1.0 max | 1.0 max |
| Zinc (Zn) | 1.0 max | 1.0 max |
| Lead (Pb) | 0.05 max | 0.05 max |
Physical & Mechanical Properties
| Property / Parameter | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) |
|---|---|---|
| Density | 8.1 g/cm³ | 8.1 g/cm³ |
| Melting Point | 1443°C (2430°F) | 1443°C (2430°F) |
| Tensile Strength | 551 MPa / 80,000 Psi | 551 MPa / 80,000 Psi |
| Yield Strength (0.2% Offset) | 241 MPa / 35,000 Psi | 241 MPa / 35,000 Psi |
| Elongation (%) | 30% | 30% |
Equivalent Grade Standards
| Grade | Standard | Werkstoff Nr. | UNS | EN / ISO | JIS |
|---|---|---|---|---|---|
| Cu-Ni 90/10 | ASTM B151 | 2.0872 | C70600 | CuNi10Fe1Mn | C7060 |
| Cu-Ni 70/30 | ASTM B151 | 2.0882 | C71500 | CuNi30Mn1Fe | C7150 |
Grade Differentiations: Cu-Ni 90/10 vs. Cu-Ni 70/30
Copper Nickel 90/10 (UNS C70600)
Engineered with 90% copper and 10% nickel, UNS C70600 Nuts deliver maximum thermal conductivity and superior, natural biofouling resistance. They are the cost-effective industry standard for commercial shipbuilding, intake screens, and coastal desalination exchangers where preventing marine growth is critical.
Copper Nickel 70/30 (UNS C71500)
Formulated with 30% nickel, UNS C71500 Nuts provide higher mechanical strength and resistance to turbulent seawater velocity, impingement, and extreme pressure. They are built for critical applications, including naval submarine systems, high-pressure hydraulic lines, and offshore oil platforms.
Why Industries Prefer Copper Nickel Nuts
Naval architects and offshore engineers select cupronickel bolting over traditional stainless steels because copper-nickel alloys do not suffer from chloride-induced stress corrosion cracking or tight-gap crevice corrosion in stagnant seawater.
As a dedicated Copper Nickel Nuts Supplier, Aurum Overseas manufactures fasteners that naturally inhibit marine organism attachment, preventing structural weight accumulation and thread seizing on subsea hardware without requiring external cathodic protection or anti-fouling paints.
Types of Copper Nickel Nuts
Aurum Overseas supplies a comprehensive range of Copper Nickel nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Copper Nickel Hex Head Nuts
Copper Nickel Square Nuts
Copper Nickel Lock Nuts
Copper Nickel Eye Nuts
Copper Nickel Wing Nuts
Copper Nickel T Nuts
Copper Nickel Panel Nuts
Copper Nickel Coupling Nuts
Copper Nickel Dome Nuts
Key Advantages of Copper Nickel Nuts
Inherent Anti-Fouling
Copper-rich oxide layers continuously leach trace copper ions that prevent algae, barnacles, and mussels from colonizing thread assemblies.
Erosion & Impingement Resistance
Maintains structural integrity in high-velocity seawater piping systems and turbulent cooling water discharges.
Immunity to Chloride SCC
Completely immune to chloride-induced stress corrosion cracking that commonly affects standard austenitic stainless steels in warm marine air.
Non-Galling Thread Engagement
Excellent natural lubricity reduces thread seizing and galling during installation and maintenance torquing.
Low Temperature Ductility
Retains impact strength and mechanical toughness without embrittlement in sub-zero polar maritime conditions.
Key Applications of Copper Nickel Nuts
| Industry Sector | Primary Fastener Application | Key Service Environment |
|---|---|---|
| Marine & Shipbuilding | Hull penetration fittings, sea chests, propulsion mountings | Submerged raw seawater, tidal zones, and high-salinity harbor waters |
| Seawater Desalination | Brine heater flanges, flash evaporator bolting | High-temperature concentrated brine streams and raw seawater feeds |
| Offshore Oil & Gas | Splash zone structural joints, subsea manifold piping | Severe salt spray, wave action, and high-salinity marine atmospheres |
| Power Generation | Condenser tube sheet bolting, coastal cooling intakes | Flowing cooling water, estuarine brackish water, and chlorinated intake streams |
Quality Testing & Inspection
As a quality-driven Copper Nickel Nuts Supplier and Copper Nickel Nuts Exporter, Aurum Overseas subjects every manufacturing lot to strict quality assurance protocols.
- Positive Material Identification (PMI): Non-destructive XRF analysis to confirm precise copper, nickel, iron, and manganese composition ratios.
- Mechanical Tensile Testing: Proof load, yield, tensile, and elongation verification per ASTM E8 standards.
- Dimensional Inspection: Go/No-Go thread gauge testing per ASME B1.2 and ISO metric standards to ensure accurate thread fit.
- Material Certification: Complete EN 10204 3.1 Material Test Reports provided with every shipment for full heat traceability.
Global Export Markets
As an international Copper Nickel Nuts Exporter, Aurum Overseas provides fast delivery and complete export documentation to clients worldwide.
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Copper Nickel 90/10 Nuts offer superior biofouling resistance and higher thermal conductivity, while Copper Nickel 70/30 Nuts provide higher strength and better resistance to high-velocity seawater erosion.
UNS C70600 Nuts slowly release copper ions through a natural oxide film, creating a surface environment that prevents barnacles and algae from attaching.
Yes, UNS C71500 Nuts do not suffer from chloride stress corrosion cracking, making them reliable for warm, high-salinity marine environments.
It is recommended to match cupronickel nuts with compatible copper-nickel or high-nickel bolts to eliminate galvanic corrosion risks in submerged seawater service.
Cupronickel nuts are typically manufactured from bar stock complying with ASTM B151, with dimensions conforming to ASME B18.2.2 or ISO 4032 standards.
Contact Aurum Overseas
Aurum Overseas manufactures high-performance Copper Nickel Nuts engineered for marine and industrial applications with global delivery options.
Contact our technical sales team today for product specifications, stock availability, and instant pricing quotes.