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| Property | Value |
|---|---|
| UNS Number | C71500 |
| ASTM Standard | ASTM B171 / B122 |
| Tensile Strength | 370-450 MPa |
| Density | 8.94 g/cm³ |
| Max Service Temp | 300°C |
| Corrosion Rating | Excellent in seawater |
| Element | Composition (%) |
|---|---|
| Cu | bal |
| Ni | 29.0–33.0 |
| Fe | 0.40–1.0 |
| Mn | 0.50–1.5 |
| Pb | ≤0.05 |
| Zn | ≤1.0 |
| C | ≤0.05 |
Cupro Nickel 70/30 fasteners derive their properties from a copper matrix alloyed with 30% nickel, along with small controlled additions of iron and manganese. Nickel enhances strength and imparts exceptional resistance to seawater corrosion, while iron improves resistance to impingement attack and manganese aids deoxidation and hot workability. This balanced composition results in a single-phase solid solution alloy that retains ductility across a wide temperature range while offering superior stability in aggressive marine environments.
These fasteners deliver outstanding resistance to biofouling, crevice corrosion and stress corrosion cracking, making them ideal for marine hardware, shipbuilding, offshore platforms and seawater piping systems. Their good thermal conductivity, moderate strength and excellent ductility allow reliable performance under cyclic loading and elevated temperatures up to 300°C. The alloy’s non-magnetic nature and weldability further extend its suitability for critical fastening applications where long-term corrosion resistance and mechanical reliability are essential.
Specifications
Cupro Nickel 70/30 Fasteners are defined by precise dimensional specifications, mechanical properties, and technical data suited for corrosion-resistant service in marine environments. Their performance is typically evaluated through strength, hardness, and size tolerances, making them a reliable fastening solution for demanding industrial applications.
| Property | Value |
|---|---|
| Tensile Strength | 370-450 MPa |
| Yield Strength (0.2%) | 145-205 MPa |
| Elongation | 30-45% |
| Hardness | 65-90 HRB |
| Modulus of Elasticity | 152 GPa |
| Thermal Conductivity | 29 W/m·K |
| Density | 8.94 g/cm³ |
| Melting Range | 1170-1240°C |
| Max Service Temperature | 300°C |
| Standard Type | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B18.31, DIN 976 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | DIN 125, ASME B18.22.1 |
| Thread Form | UNC, UNF, Metric (ISO) |
| Diameter Range | M3 - M100 / 1/8" - 4" |
| Length Range | 10mm - 500mm |
| Available Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
Applications
