Copper and Copper Alloys - Brass - CW721R High Tensile Brass ~ Manganese Bronze

CW721R High Tensile Brass ~ Manganese Bronze

Brasses are alloys of Copper and Zinc. They may also contain small amounts of other alloying elements to impart advantageous properties. Brasses have high corrosion resistance and high tensile strength. They are also suited to fabrication by hot forging. Free machining grades of brass set the standard for machining by which other metals are compared.
Brasses are divided into two classes. The alpha alloys, with less than 37% Zinc, and the alpha/beta alloys with 37-45% zinc. Alpha alloys are ductile and can be cold worked. Alpha/beta or duplex alloys have limited cold ductility and are harder and stronger. CZ114 /CW721R is a duplex or alpha/beta alloy.
Brass alloy CZ114/CW721R is a versatile high strength, hot workable, machinable engineering alloy sometimes referred to as a Manganese Bronze or High Tensile Brass.

CZ114 / CW721R is typically used in:
~ Architectural applications
~ High strength components
~ Valves
~ Valve stems
~ Fittings
~ Marine fittings

Chemical Composition

Spec: EN 12164:2011

CW721R Brass

Chemical Element % Present
Lead (Pb) 0.80 - 1.60
Tin (Sn) 0.20 - 1.00
Iron (Fe) 0.20 - 1.20
Aluminium (Al) 0.30 - 1.30
Copper (Cu) 57.00 - 59.00
Manganese (Mn) 0.80 - 1.80
Others (Total) 0.0 - 0.30
Nickel (Ni) 0.0 - 0.30
Zinc (Zn) Balance


Physical PropertyValue
Density 8.63 g/cm³
Melting Point 865 °C
Modulus of Elasticity 96.5 GPa
Thermal Conductivity 88.3 W/m.K
Electrical Resistivity 0.090 x10^-6 Ω .m

Spec: EN 12164:2011

Bar - From 5mm to 40mm Dia.

Mechanical PropertyValue
Proof Stress 180-270 MPa
Tensile Strength 440-500 MPa
Hardness Brinell 100-140 Max HB
Elongation A 20-12 %

Alloy Designations

CW721R/CZ114 Brass corresponds to the following designations but may not be a direct equivalent:

UNS C67500   

CZ114 is also sometimes called Manganese Bronze.

Supplied Forms

CZ114 / CW721R Brass is typically supplied as Round Bar

  • Bar

Corrosion Resistance

The addition of Tin to the composition of CZ114/CW721R increases this alloys’ resistance to corrosion in marine and mildly acidic environments.

Cold Working

CZ114/CW721R has a poor rating for cold working.

Hot Working

Hot working of CZ114/CW721R is excellent.

The hot forgeability rating is very good, rated at 80 compared to forging brass which rated as 100. The recommended hot working temperature for this alloy is between 625 and 750°C.

Heat Treatment

The annealing temperature of CZ114/CW721R is between 425°C and 600°C.


CZ114/CW721R has a poor machinability rating of 30 compared to Brass CZ121/CW614N which is rated as 100.


Soldering and brazing of CZ114/CW721R are rated as excellent.

Oxyacetylene welding, butt welding and spot welding are rated as good.

Gas shielded arc welding and seam welding are rated as fair.

Coated metal arc welding is not recommended.

Datasheet Search

Last Datasheet Revision

18 July 2019


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.