DEF STAN 02-835 Cupronickel: High‑Strength, Corrosion‑Resistant Alloy for Marine & Offshore Use
DEF STAN 02-835 Copper Alloy is a hot forged, stress relieved high strength cupronickel developed primarily for marine and offshore applications. The alloy contains around 14.5% nickel, 4.5% manganese and smaller additions of aluminium and iron to increase the overall material strength and corrosion resistance. Specified as an MoD (Navy) grade, it combines the inherent corrosion resistance and antibiofouling benefits of traditional cupronickels whilst offering higher strength and toughness levels than the aluminium bronzes. It shows the following features and properties:
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 23.0 °C | 8.53 g/cm³ |
Mechanical
| Property | Temperature | Value |
|---|---|---|
Charpy impact energy, V-notch | 23.0 °C | 40 J |
Elongation | 23.0 °C | 18 - 22 % |
Tensile strength | 23.0 °C | 710 - 725 MPa |
Yield strength Rp0.2 | 23.0 °C | 400 - 430 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 1.6E-5 1/K | for 0-400°C |
Melting point | 1030 - 1085 °C | ||
Thermal conductivity | 23.0 °C | 25 W/(m·K) |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical resistivity | 23.0 °C | 3.5E-7 Ω·m |
Magnetic
| Property | Temperature | Value | Comment |
|---|---|---|---|
Relative magnetic permeability | 23.0 °C | 1.01 [-] | max. |
Chemical properties
| Property | Value | Comment | |
|---|---|---|---|
Aluminium | 1 - 2 % | ||
Chromium | 0.5 % | ||
Copper | Balance | ||
Iron | 0.7 - 1.2 % | ||
Manganese | 3.5 - 5.5 % | ||
Nickel | 13.5 - 16.5 % | ||
Other | 0.3 % | max., Inosinic acid (IMP) | |
Technological properties
| Property | ||
|---|---|---|
| Application areas | Offshore & marine: Critical marine fasteners, gears, shafts, pipe couplings, sonar equipment, connectors, flanges and subsea components | |
| Corrosion properties | Excellent corrosion and pitting resistance in marine environments | |
| General machinability | Easily machined | |
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