C64200 - Copper Alloys

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.

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)

Key Features

Low magnetic permeability
Very easy to machine
Resistant to dynamic stresses
Corrosion resistant

Typical Uses

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.

Description	Silicon Aluminium Bronze
Nominal Composition	CuAl7Si2
Alloy Type	wrought

Typical Mechanical Properties

Tensile Strength (N/mm²)	580
Proof/Yield Strength (N/mm²)	265
Elongation (%)	30
Hardness Brinell	120
Impact Izod J20°C

Typical Physical Properties

Density g/cm³	7.7
Melting Temperature Range °C	985 - 1005
Thermal Conductivity W/mK	45
Electrical Resistivity μΩ.m15°C
Coefficient of Thermal Expansion 0-250°C	18
Relative Magnetic Permeability
Coefficient of Friction

Copper Alloys 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’s technical team on +44 (0) 1782-816888, or email [email protected].

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 accepted 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.