NES 780 Copper–Nickel 70/30 Alloy: Superior Corrosion Resistance & Strength
2.0882 (CuNi30Mn1Fe) is a 70% copper, 30% nickel alloy with additions of iron and manganese. These elemental additions make it somewhat more resistant to corrosion and erosion and with slightly improved strength level than 90/10, making it suitable for more demanding applications. In particular, its corrosion resistance is notably improved in high-velocity waters (up to 4.5m/s) and polluted seawater. It shows the following features and properties:
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 23.0 °C | 8.95 g/cm³ |
Mechanical
| Property | Temperature | Value |
|---|---|---|
Elastic modulus | 23.0 °C | 152 GPa |
Elongation | 23.0 °C | 27 - 30 % |
Hardness, Brinell | 23.0 °C | 80 - 120 [-] |
Shear modulus | 23.0 °C | 56 GPa |
Tensile strength | 23.0 °C | 310 - 330 MPa |
Yield strength Rp0.2 | 23.0 °C | 125 MPa |
Thermal
| Property | Temperature | Value |
|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 1.6E-5 1/K |
Specific heat capacity | 23.0 °C | 377 J/(kg·K) |
Thermal conductivity | 23.0 °C | 29 W/(m·K) |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical conductivity | 23.0 °C | 2.90E+6 S/m |
Electrical resistivity | 23.0 °C | 3.4E-7 Ω·m |
Specific Electrical conductivity | 5 % IACS |
Chemical properties
| Property | Value |
|---|---|
Copper | Balance |
Iron | 0.7 % |
Manganese | 1 % |
Nickel | 30 % |
Technological properties
| Property | ||
|---|---|---|
| Application areas | Offshore & marine: Salt water flanges, salt water piping and pipe fittings, valve bodies, sea water intakes, pipe fittings, water boxes, propeller sleeves, pump bodies and parts;Chemical processing: Heat exchanger and cooling plant, evaporator tubes, distiller tubes, refrigerator and condenser components;Other: Welding backing rings, flexible metal hose, weld wire and boiler parts | |
| Cold Forming | Good cold formability | |
| Corrosion properties | Excellent corrosion and pitting resistance in marine environments | |
| General machinability | Easily machined, Machinability rating: 20 | |
| Hot forming | Good hot formability with hot working temperature between 925-1025°C. | |
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