Key Features

Equivalent Specifications

US
ASTM B 150 C64200
AMS 4631
SAE J461
ASTM B 124 C64200
AMS 4633
SAE 463
ASTM B 171 C64200
AMS 4634
ASTM B 283 C64200
ASM SB 150 C64200
QQ-C-465B (1) C64200

European
BS EN 12420 CW302G
BS EN 12163 CW302G
BS EN 12165 CW302G
BS EN 12167 CW302G

British Defence Specifications
Def Stan 02 834 (was NES 834)

Applications

Typical applications for the C64200 silicon aluminium bronze material include:

Marine Defence / Navy
Specialist instrument applications requiring low magnetic permeability properties such as protective casing and fixings. Marine fasteners, bolts and nuts, on-deck hardware, weapons handling equipment, sonar equipment, radar equipment, various marine valve components.

Industrial Engineering
Non-sparking safety tooling, valve stems and seats, wear plates, welding clamps, valve spindles and components, fasteners and bearing bushes.
Specialist automobile value guides.
Condenser end plates for steam generation equipment and desalination plants.

Tel +44 (0) 1782-816888  
Email sales@copperalloys.net
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C64200

Silicon Aluminum Bronze
CuAl7Si2

An American free machining Silicon aluminium bronze where its unique combined properties of high strength, good fatigue, excellent corrosion resistance in salt water and low magnetic permeability, make it a popular choice for many sea water applications.

C642 aluminium bronze has higher ductility than the nickel aluminium bronzes and can be cold worked to enhance the mechanical properties. The alloy has also excellent anti-galling and bearing properties.

The low magnetic properties enables the alloy to be used in Navy applications such as mine hunters, for instrumentation such as sonar, compasses and other sensitive instruments which may also require good corrosion resistance in a hostile environment.

Composition

ElementCu Al Si
%Bal 6.3-7.6 1.5-2.2

Typical Mechanical Properties

FormSize Range Yield 0.2% UTS Elong % Hardness (HB)
Imperial Metric Ksi MPa Ksi MPa % (HB)
HR50 >2-3” >50-80mm 35-37 240-255 75-90 515-620 15-35 120-150
HR50 >3-4” >80-100mm 30-35 205-241 70-80 485-551 15-40 120-150
M10 >4” >100mm 25-40 170-276 70-80 485-551 15-40 120-150

Tempers:

Copper Alloys Manufacturing Ranges

Copper Alloys produces some of the largest forgings in the industry. C64200 is available as standard in rod, bar, blocks, rings, tubes and discs up to an individual piece weight of 4,500kg/9,900lbs.

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

Copper Alloys Ltd also offers precision machined components in all of its 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

Imperial Metric
Density 0.278lb/³ @ 68º F 7700 kg/m³ @ 20ºC
Specific Gravity 7.69 7.69
Specific Heat 0.09 Btu/lb º F @68º F 377j/kg ºC @20 ºC
Electrical Conductivity 8% IACS @ 68º F 0.047mega Siemens/cm @20 ºC
Thermal Conductivity 26 Btu/ft²/fthr/ º F) @68º F 0.450 W/cm/ ºC @20 ºC
Thermal Expansion 10.0 x10ˉ 6 / º F (68-572 º F) 17.3 x10ˉ 6 /ºC (20-300 ºC)
Electrical Resistivity 129Ωcmil/ft @ 68º F 21.55µ Ωcm@20 ºC
Relative Magnetic Permeability <1.01µ
Machining Index 60 (Based on free machining brass 100%)
Modulus of Rigidity 6000ksi 41370 MPa
Modulus of Elasticity (In Tension) 16000ksi 111000 MPa
Melting Range 1795-1850 ºF 980-1010 ºC
Hot Working Range 1380-1560 ºF 750-850 ºC
Cold Working Good
Cryogenic Retains properties down to – 302 ºF (-190 ºC)
Elevated Temperatures Retains properties to 570 ºF (300 ºC)

Optimised material production

  1. Proof and finish machining capability - Copper Alloys Ltd also produces made-to-print components in all of its alloys.
  2. Complete highly controlled project management is available for full ranges of kit and components.
  3. Tailored and customised mechanical properties beyond those of the specification to meet special requirements.

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)

Copper Alloys Ltd has the ability to modify existing alloys for improved performance. Many customers have benefited from this in the past.

To discuss your requirements, call a member of Copper Alloys Ltd's technical team on +44 (0) 1782-816888, or email sales@copperalloys.net.

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.