Bronzes are Copper-based alloys with the major alloying element being Tin. They offer a combination of properties such as high strength, hardness, corrosion resistance and wear resistance.
Copper-Aluminium alloys are commonly known as Aluminium Bronzes. These alloys are a range of Copper-based alloys in which the primary alloying element is up to 14% Aluminium. The four major groups of Aluminium Bronze are:
~ Single phase alloys containing less than 8% of Aluminium.
~ Two-phase (duplex) alloys containing 8 to 11% Aluminium. These alloys also frequently have additions of Iron and Nickel to increase strength. This group’s contains casting alloys AB1 and AB2, the wrought alloys CA105, CA104 and Defence Standard alloys (formerly Naval Engineering Standard, NES - NES 747 when cast and the wrought form NES 833).
~ The low magnetic permeability Aluminium-Silicon alloys.
~ The Copper-Manganese-Aluminium alloys with good castability.
Alloy Defence Standard (NES) 833 is an Aluminium Bronze with good ductility and impact strength. It also has superior corrosion resistance.
Applications
Aluminium Bronze to Defence Standard (NES) 833 is typically used in:
~ Marine Valves
~ Pumps
~ Weapons handling systems
~Couplings
~ Fasteners
~ Gears
~ Marine propeller shafts
Alloy Designations
Def-Stan (NES) 833 corresponds to the following designations:
DEF STAND 833
NES 833
DGS 1043
CW307G (not an exact equivalent)
Corrosion Resistance
Defence Standard (NES) 833 has high corrosion resistance, particularly in marine environments.
It is immune to chloride stress corrosion cracking.
This alloy also has excellent resistance to cavitation erosion.
Temperature Resistance
Defence Standard (NES) 833 largely retains its strength and hardness up to 400°C.
It is also resistant to high temperature scaling at up to 1000°C
Weldability
Defence Standard (NES) 833 is fully weldable by common welding methods.
Machinability
Machinability is poor rated at 30 compared to Brass CZ121 / CW614N which is rated as 100.
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 temper, 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 is 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.