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 cover 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% 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 contains casting alloys AB1 and AB2, the wrought alloys CA105, CA104 and Defence Standard (formerly Naval Engineering Standard 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 CA104 is an Aluminium Bronze with high strength. CA104 also has excellent corrosion resistance, abrasion resistance and ability to withstand shock loading.
CW307G/CA104 is typically used in:
~ Valve and pump components
~ Marine equipment
~ Engine components
~ High temperature applications
Bronze CW307G corresponds to the following designations but may not be a direct equivalent:
CW307G/CA104 is typically supplied as Round rod
Corrosion resistance is considered to be excellent in most environments.
CW307G/CA104 has only a fair rating for cold working.
The hot forgeability rating for CW307G/CA104 is quite good at 70, compared to Forging Brass which is rated as 100.
The recommended hot working temperature for this alloy is between 815 and 900°C. The hot working capabilities of CA104 are considered to be good.
Solution treatment or annealing can be done by rapid cooling after heating to 620-800°C.
Bronze alloy CW307G/CA104 has a fairly poor machinability rating of 30 compared to Brass CZ121/CW614N which is rated as 100.
Gas shielded arc welding of CW307G/CA104 is rated as excellent.
Coated metal arc welding, spot welding and butt welding are rated as good.
Soldering, brazing and seam welding are rated as fair.
Oxyacetylene welding is rated as fair.