Copper and Copper Alloys - Phosphor & Leaded Bronze - CW307G Rod and Bar

CW307G Rod and Bar

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
~ Fasteners
~ Engine components
~ High temperature applications

Chemical Composition

Spec: EN 12163:2011


Chemical Element % Present
Iron (Fe) 3.00 - 5.00
Aluminium (Al) 8.50 - 11.00
Manganese (Mn) 0.0 - 1.00
Nickel (Ni) 4.00 - 6.00
Lead (Pb) 0.0 - 0.05
Others (Total) 0.0 - 0.20
Silicon (Si) 0.0 - 0.20
Tin (Sn) 0.0 - 0.10
Zinc (Zn) 0.0 - 0.40
Copper (Cu) Balance


Physical PropertyValue
Density 7.58 g/cm³
Melting Point 1035 °C
Modulus of Elasticity 115 GPa
Thermal Conductivity 37.7 W/m.K

Spec: EN 12163:2011

Rod & Bar - 10mm to 120mm Dia / AF

Mechanical PropertyValue
Proof Stress 320-400 Min MPa
Tensile Strength 680-740 Min MPa
Hardness Brinell 170 to 210 HB
Elongation A 8-10 Min %

Alloy Designations

Bronze CW307G corresponds to the following designations but may not be a direct equivalent:

UNS C63200


Supplied Forms

CW307G/CA104 is typically supplied as Round Bar

  • Bar

Corrosion Resistance

Corrosion resistance is considered to be excellent in most environments.

Cold Working

CW307G/CA104 has only a fair rating for cold working.

Hot 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.

Heat Treatment

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.

Datasheet Search

Last Datasheet Revision

11 January 2016


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

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, whether expressed or implied.

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. All transactions are subject to the Company’s current 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.