DEF STAN 02-834 / NES 834 Bronze – High‑Strength, Low‑Magnetism Aluminium‑Silicon Bronze
This aluminium silicon bronze has similar attributes to the other aluminium bronzes, with a 2% silicon addition to enhance the material strength, corrosion resistance and impact strength whilst also improving the alloy machinability. As an MoD (Navy) specification, this material is subject to special requirements including impact properties and a controlled low magnetic permeability level of <1.05. It shows the following features and properties:
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 23.0 °C | 7.8 g/cm³ |
Mechanical
| Property | Temperature | Value |
|---|---|---|
Charpy impact energy, V-notch | 23.0 °C | 33 J |
Elongation | 23.0 °C | 9 - 20 % |
Tensile strength | 23.0 °C | 515 - 620 MPa |
Yield strength Rp0.2 | 23.0 °C | 220 - 310 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 1.8E-5 1/K | for 0-300°C |
Melting point | 980 - 1010 °C | ||
Thermal conductivity | 23.0 °C | 45 W/(m·K) |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical conductivity | 23.0 °C | 4.06E+6 - 5.22E+6 S/m |
Specific Electrical conductivity | 7 - 8 % IACS |
Magnetic
| Property | Temperature | Value |
|---|---|---|
Relative magnetic permeability | 23.0 °C | 1 [-] |
Chemical properties
| Property | Value | Comment | |
|---|---|---|---|
Aluminium | 6 - 6.4 % | ||
Copper | Balance | ||
Iron | 0.5 - 0.7 % | ||
Manganese | 0.5 % | max. | |
Silicon | 2 - 2.4 % | ||
Technological properties
| Property | ||
|---|---|---|
| Application areas | Offshore & marine: High strength and non-magnetic fasteners and components;Other: Fasteners, safety tooling, valve components, non-magnetic parts, marine hardware, gears, bearings and bushes and instrumentation components | |
| Corrosion properties | Excellent corrosion resistance | |
| General machinability | Good machinability | |
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