A naturally anti bio-fouling UK Defence Standard High Strength Cupro Nickel which has unique excellent corrosion resistance with general corrosion rates of <0.025mm/year, does not suffer from hydrogen embrittlement, has excellent anti-galling properties, has good resistance to erosion corrosion and is almost insensitive to stress corrosion.
Def Stan 02-835 retains its strength well at moderately elevated temperatures, has good hot-working properties and is readily weldable. Def Stan 02-835 can also be used in cryogenic applications down to -196ºc with no loss in impact strength. The most commonly used wrought forms are individual forgings, and long products such as rod and bar.
This wrought high strength cupro nickel alloy has a higher tensile strength and impact strength than nickel aluminium bronze and has a proven track record having been incorporated in to various submarine build programs for many decades. It is galvanically compatible with other copper alloys and stainless steel. Def Stan 02-835 is also being used for wider applications in a variety of industries around the world, predominantly within commercial marine and petrochemical industries, which benefit from the attractive blend of physical and mechanical properties.
| Element |
Cu |
Ni |
Mn |
Fe |
Al |
Cr |
Impurities |
| % |
Bal |
13.5-16.5 |
3.5-5.5 |
0.7-1.2 |
1-2 |
0.5 Max |
0.3 Max |
| Form |
Cross sectional area
Metric mm |
Yield 0.2% MPa |
UTS
MPa |
Elong % |
Izod (Joules) |
| Rod |
>>15-125 |
430-600 |
725-770 |
18-23 |
40-70 |
| Rod |
>125 |
400-500 |
710-740 |
18-25 |
40-80 |
| Forgings |
All sizes |
400-500 |
710-740 |
18-24 |
40-76 |
With very little limitation on size, Def Stan 02-835 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 |
8500 kg/m³ |
| Specific Gravity |
8.5 |
| Specific Heat |
435J/kg K |
| Electrical Conductivity |
5% IACS 2.85mΩ/mm² @ 20ºC |
| Thermal Conductivity |
25 W/mK |
| Thermal Linear Expansion |
16 µstain/K Range (20-200 ºC) |
| Electrical Resistivity |
0.35 µ Ωm |
| Relative Magnetic Permeability |
<1.01 µ |
| Machining Index |
20% (Based on free machining brass 100%) |
| Modulus of Rigidity |
52 GPa |
| Modulus of Elasticity (In Tension) |
145 GPa |
| Fatigue Limit in air (rotating) |
108 cycles +/- 230 MPa |
| Melting Range |
1030-1090 ºC |
| Hot Working |
850-1000ºC |
| Cold Working |
fair |
| Cryogenic |
Retains properties down to -169 ºC |
| Elevated Temperatures |
Retains properties to 350 ºC |
Optimised material production
- Precision machining – Copper Alloys Ltd. has a deep understanding of machining in all of its alloys. Buying components direct from the material producer will be cost effective and risk-free for the customer.
- 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.
- Tailored and customised properties (physical and mechanical) beyond those of the specification to meet special requirements
Joining
(BS EN 150 156114-G (welding specification) ) Recommended Welding Processes
- Tungsten inert gas (TIG) or gas tungsten arc(GTAW)
- Metal inert gas (MIG) or gas metal arc (GMAW)
- Manual arc (MMA)
- Friction welding
- Laser welding
Equivalent Specifications
UK
Def Stan 02-835 Issue 2(Class 1-4,Grade 1-2)
NES 780
Def Stan 02-729 (Non destructive testing)
DGS 357
US
DOD-C-24676
C72400
Key Features
- Highly corrosion resistant
- Immune to Hydrogen embrittlement
- Immune to bio-fouling
- Excellent combination of strength and ductility
Typical Uses
Specialist applications requiring the ability to withstand dynamic stresses and extreme environmental corrosion are most suitable for Def Stan 02-835 to be used. Much more cost effective than some of the highly processed nickel-based alloys, it is a low cost alternative material option that will last well in aggressive environments.
Marine Defence
Weapons handling equipment, sump block, high pressure marine actuation systems, components in sonar devices, hose couplings, gears, mechanical seals and washers, actuators, winch components, pump and propeller shafts.
Petrochemical
Subsea fasteners and bolting, shafts for pumps and valves, valve spindles, hydraulic pistons and cylinders, sub sea connectors. Process control equipment.
