NES834 / DEF STAN 02-834 / DGS1044

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Defence Standard 02-834 / NES834 is an aluminium silicon bronze that offers similar properties to other aluminium bronzes including good strength levels and a high corrosion resistance. However, it is primarily recognised and specified by the MoD (Navy) for its controlled low magnetic permeability level of <1.005.

With an aluminium content of ~6% and a ~2% silicon addition the material gives designers a very good impact strength that is maintained down to cryogenic temperatures. The Defence Standard 02-834 also offers a superior machinability rating to other aluminium bronzes providing designers with a superb combination of properties and more options during the material selection process.

Related Specifications

Def Stan 02-834

NES 834 Pt 2

Def Stan 02-879 Annex D

CA107

C64200

DGS 1044

DGS8543

CW301G

Chemical Composition

Copper                                                                

Rem

Aluminium                                         

6.0-6.4%

Nickel                                                   

2.0-2.4%

Iron                                                       

0.5-0.7%

Total Impurities                               

0.50% max

Key Features

  • High Mechanical Strength and Toughness
  • Very low magnetic permeability
  • Good Impact Strength
  • Very Good Corrosion Resistance
  • Non- Sparking
  • Retention of properties at sub-zero temperatures

Mechanical Properties

 

6-15mm

15-50mm

50-100mm 

>100mm 

UTS (N/mm2)

525

525

525

525

Proof (N/mm2)

275

275

235

220

Elongation (%)

20

20

20

20

Impact Strength (J)

-

33

33

33

Physical Properties

Density

7.8 g/m3

Specific Heat                                                     

380 J/Kg K

Melting Range                                                  

1060-1075°C

Coeff. Thermal Expansion (20-300?C)

18 x 10-6

Thermal Conductivity

45 W/m °K

Electrical Conductivity

8 % IACS

Magnetic Permeability   

<1.05

Modulus of Elasticity

110-125 KN/mm2

Fabrication Properties

Annealing Temp

600-700°C

Stress Relieving Temp

300-400°C

Hot Working Temp

850-900°C

Hot Formability

Good

Cold Formability

Fair

Machinability Rating

60% (Free machining brass = 100)

Joining Methods

Soldering

Not Recommended

Brazing

Fair

MIG Welding

Good

TIG Welding

Good

Resistance Welding

Good

Typical Applications

The Def Stan 02-834 is mainly utilised by the MoD Navy for non-magnetic parts and including high strength fasteners and chains, but due to its fantastic blend of properties it is also used for safety tooling, valve components, non-magnetic parts, marine hardware, gears, bearings and bushes and instrumentation components.

This technical information is given by Holme Dodsworth Metals without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.

 

Copper                                                                                          

Rem

Aluminium                                         

6.0-6.4%

Nickel                                                   

2.0-2.4%

Iron                                                       

0.5-0.7%

Total Impurities                               

0.50% max

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Holme Dodsworth Metals Limited.
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