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Def Stan 02-833

Nickel Aluminium Bronze
CuAl9Ni5Fe5
Available with enhanced mechanical properties

A British Defence Standard, nickel-aluminium bronze which has unique combination of properties of high strength, good fatigue and good corrosion (about ten-times that of 316 stainless steel) resistance in sea water. Not least because of its immunity to bio-fouling, Def Stan 02-833 also possesses extremely good wear resistance and anti galling properties.

Def Stan 02-833 is a high tensile wrought alloy, which has a proven track record of being used throughout the British submarine build program since the 1980s and is now being used for wider applications, within commercial marine and petrochemical industries.

Superseding Def Stan 02-747 for all components, for the same chemistry Def Stan 02-833 offers significantly higher mechanical strength and improved integrity. Furthermore, the finer grain structure of the Def Stan 02-833 allows for ultrasonic inspection, which is a fraction of the cost of x-ray radiographic examination required for castings.

This is a wrought alloy that benefits from extreme consistency in properties, fine equiaxed grain structure and low cost volumetric inspection. Furthermore representative test pieces are taken giving accurate analysis of properties from material to component.

Composition

Element	Cu	Al	Ni*	Fe
%	Bal	8.5-10.0	4.0-5.5	4.0-5.5

Typical Mechanical Properties

Form	Size Range Metric	Yield 0.2% MPa	UTS MPa	Elong %	Izod (Joules)	Hardness HB
Rod	25-100mm	295-400	635-700	20-30	27-40	165-200
Rod	>100mm	245-360	620-700	20-30	23-40	165-200
Forgings	All sizes	245-365	245-360	20-30	23-38	165-190

Procurement Recommendations

1. Buy components direct from the material manufacturer – where possible, due to the specialist nature of this alloy, it is normally lower risk and much more cost effective to buy finished components from the mill.
2. Project management is available for full ranges of kit and components. Harnessing the Copper Alloys quality management system guarantees delivery on-time and in full.
3. Tailored and customised properties (physical and mechanical) beyond those of the material specification to enhance performance.

Manufacturing Ranges

With very little limitation on size, Def Stan 02-833 is available as standard in rod, bar, blocks, rings, tubes and discs up to a piece weight of 4,500kg/9,900lbs.

Copper Alloys is also regularly making customised shaped forgings and can increase piece weight up to 20,000kg/44,000lbs.

Copper Alloys Ltd also offers finished machined components in all alloys, complete project management and tailored mechanical properties beyond those of the specification to meet special requirements.

All information is supplied for guidance only and gives no guarantee for end applications.

Typical Physical Properties

(Courtesy Def Stan 02-879)

	Metric
Density	7590 kg/m³
Specific Gravity	7.59
Specific Heat	420J/kg K
Electrical Conductivity	0.041mega Siemens/cm @20 ºC
Thermal Conductivity	42 W/mK
Thermal Linear Expansion	17.1 µstain/K Range (20-200 ºC)
Electrical Resistivity	0.13 µ Ωm.m
Relative Magnetic Permeability	1.5µ
Machining Index	40 (Based on free machining brass 100%)
Modulus of Rigidity	49 GPa
Modulus of Elasticity	125 GPa
Shear Strength	415MPa
Poisson’s Ratio	0.32
Fatigue Limit in air (rotating)	1x107 cycles +/- MPa (278-293)
Melting Range	1060-1075 ºC
Hot Working	700-925 ºC
Cold Working	Poor
Cryogenic	Retains properties down to – 302 ºF (-190 ºC)
Elevated Temperatures	Retains properties to 662 ºF (350 ºC)

Joining

Recommended Welding Processes

1. Tungsten inert gas (TIG) or gas tungsten arc(GTAW)
2. Metal inert gas (MIG) or gas metal arc (GMAW)
3. Manual arc (MMA)
4. Friction welding
5. Laser welding
6. Soldering or brazing or oxy-acetylene (not recommended)