CW721R / CZ114 is a high tensile brass consisting of a duplex structure. Developed for more exacting applications where strength and corrosion resistance are required. Also referred to as a manganese bronze the CW721R / CZ114 has additions of aluminium, iron, tin and manganese that are added to the basic 60/40 brass matrix, creating a variety of properties to benefit the designer.
The aluminium and tin content gives the CW721R / CZ114 a brighter finish and is the main reason for the increase in corrosion resistance. The iron and manganese additions also improve the strength level, with the iron also acting a grain refiner. Some of the other benefits of the CW721R / CZ114 grade are a very good hot working capacity to allow for hot stamping and a good machinability rating.
Related Specifications
| CZ114 | CuZn39AlFeMn |
| CW721R |
Chemical Composition
| Copper | 56.5-58.5% |
| Tin | 0.2-0.8% |
| Lead | 0.5-1.5% |
| Iron | 0.3-1.0% |
| Aluminium | 1.5% max |
| Manganese | 0.5-2.0% |
| Zinc | Rem |
Key Features
Typical Physical Properties
| Melting Point | 910°C |
| Density | 8.36 g/cm³ |
| Specific Heat | 380 J/Kg°K |
| Thermal conductivity (RT) | 88 W/m°K |
| Thermal expansion coefficient (20-200°C) | 20 x 10-6 |
| Electrical conductivity | 21% IACS |
| Electrical Resistivity | 0.082 ohm mm2/m |
| Magnetic Permeability | 1.07 |
| Young’s Modulus | 97 x 103 N/mm2 |
Fabrication Properties
| Hot Working Temperature Range | 700-750°C |
| Hot Formability | Very Good |
| Cold Formability | Poor |
| Machinability rating
(free cutting brass = 100) |
75% |
| Annealing Temp. Range | 425-600°C |
| Stress Relieving Temp. Range | 225-350°C |
Joining Methods
| Soldering |
Joining can be restricted
|
| Brazing | |
| Oxy-acetylene welding | |
| Gas-shielded arc welding | |
| Resistance welding: Spot and Seam | |
| Butt |
Typical Uses:
Due to the enhanced properties of CW721R / CZ114 brass it is commonly used in gas valves and fittings, fasteners, pump trim, gears, locks, heavy-duty electrical connectors, transmission components, marine hardware, safety tools and decorative metalwork.CZ112 / CW712R Naval Brass Extruded and Rolled
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