Equivalent Specifications
Def Stan 02 824
Key Features
Def Stan 824 is a Copper Nickel Chrominm alloy with the addition of silicon, manganese, iron, titanium zirconium. The alloy was developed by the MOD to replace Nickel Aluminium Bronze castings which on occasions suffered from selective phase corrosion.
This cast specification is now being manufactured in the wrought condition with enhanced properties - see our Elite Alloys section.
Typical Uses
Trials in submarine service over a period of 15 years
has proved the excellent corrosion resistance of this
alloy extending the service life of components.
The alloy has certainly fulfilled its potential, with excellent crevice corrosion measured at < 0.02mm per year and general corrosion at 0.02mm per year. The wrought properties will enable design engineers to consider a 60% increase in their design parameters giving scope to reduce the size and weight of components. The alloy has high strength and excellent toughness with impact values in excess of 100 Joules.
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Def Stan 02-824 Part 1
A UK Defence Standard for CuNi30Cr2, which is a 70/30 cupro nickel containing 2 % Chromium and small additions of Zirconium and Titanium. The alloy is
close in composition to the American alloy C71900. This alloy can be supplied in the wrought condition and has the highest corrosion resistance in sea water of all the copper based defence alloys.
| Description |
Copper Nickel Chromium
|
| Nominal Composition |
CuNi30Cr2 |
| Alloy Type |
Cast |
Typical Mechanical Properties
| Tensile Strength (N/mm²) |
480 |
| Proof/Yield Strength (N/mm²) |
300 [215] |
| Elongation (%) |
18 |
| Hardness Brinell |
170 |
| Impact Izod J20°C |
60 |
Typical Physical Properties
| Density g/cm³ |
8.8 |
| Melting Temperature Range °C |
1180-1230 |
| Thermal Conductivity W/mK |
23 |
| Electrical Resistivity μΩ.m15°C |
35 |
| Coefficient of Thermal Expansion 0-250°C |
18 |
| Relative Magnetic Permeability |
1.01 |
| Coefficient of Friction |
|
This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with tempeter, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be acepted by the Company in respect of any action taken by any third party in reliance thereon.
As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.
Any advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the Company's Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions, a copy of which is available on request.
