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Copper-nickel alloys, commonly known as cupronickel, are composed primarily of copper with varying percentages of nickel, along with small amounts of other elements such as iron and manganese. These alloys are highly valued for their excellent corrosion resistance, especially in seawater and marine environments.
Copper-nickel is widely used in applications such as marine hardware, seawater piping, desalination plants, heat exchangers, and shipbuilding. Its resistance to biofouling and stress corrosion cracking, combined with good thermal conductivity and mechanical strength, make it a preferred choice in both industrial and naval sectors. Common grades include 90/10 and 70/30 copper-nickel, which meet international standards such as ASTM B122, B466, and B467.
Standard: ASTM / ASME SB 111 / 151 / 466
Size: 1/2" to 6" OD & NB in various SWG & SCH
Grade: Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500)
Standard: ASTM B122, B171, B466, B467
Size: 1/2" to 6" OD & NB in various SWG & SCH
Grade: Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500)
Standard: ASTM / ASME SB 171, SB 151
Size: 1 mm to 100 mm
Grade: Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500)
Standard: ASTM / ASME SB 151, SB 152
Size: M4 to M100
Length: 3 mm to 200 mm
Grade: Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500)
Standard: ASTM / ASME SB 61 / 62 / 151 / 152
Size: 1/2" to 36"
Class: 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64
Grade: Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500)
Range: 5 mm to 500 mm thick, length 100 mm to 6000 mm
Standards: AMS 4650, AMS 4534, AMS 4651, AMS 4533, ASTM B196, MIL C 21657, SAE J463, SAE J461
Size: 1 mm to 250 mm width, 100 mm to 6000 mm length
Grade: UNS No. C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30)
Size: 1/2" to 48" in NB & OD (15 NB to 600 NB)
Standard: ASTM B122, B171, B466, B467
Grade: C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30)
Dimensions: API, BS, EN, ASME
Specifications: API 600/BS1414, API 598/BS EN 12266-1, ASME B16.10, B16.5, B16.25, B16.34
Grade: Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500), UNS C71640
Size: 1/8” to 16”
| Element | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) |
|---|---|---|
| Copper (Cu) | 88.6% min | 65.0% min |
| Nickel (Ni) | 9.0 – 11.0% | 29.0 – 33.0% |
| Iron (Fe) | 1.0% 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 | 0.05% max |
| Others (Impurities) | 0.3% max | 0.3% max |
| Property | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) |
|---|---|---|
| Tensile Strength | 275 – 380 MPa (40 – 55 ksi) | 310 – 480 MPa (45 – 70 ksi) |
| Yield Strength (0.2% offset) | 105 – 150 MPa (15 – 22 ksi) | 125 – 210 MPa (18 – 30 ksi) |
| Elongation (%) | 30% min | 30% min |
| Hardness (Brinell HB) | 60 – 120 HB | 80 – 150 HB |
| Modulus of Elasticity | ~ 140 GPa | ~ 150 GPa |
| Melting Point | 1090 – 1170°C | 1170 – 1240°C |
| Density | 8.94 g/cm³ | 8.95 g/cm³ |
| Thermal Conductivity | ~50 W/m·K | ~30 W/m·K |
| Electrical Conductivity | ~10% IACS | ~4% IACS |