CZ115 / CW722R - High Tensile Brass
CZ115 / CW722R consists of of a duplex structure and is a high tensile brass with a restricted aluminium content, enabling it to be soldered and brazed. Similar in composition to the CW721 / CZ114 (aluminium content aside) this grade it was developed to allow high strength brass components to be joined. Sometimes referred to as a manganese bronze the CW722R / CZ115 has additions of iron, tin and manganese that benefit the physical and mechanical attributes of the alloy.
The tin and iron additions impart higher strength levels, while the tin also improves the corrosion resistance. The CW722R / CW115 also offers good fabrication properties with a very good machinability rating, ease of hot forging and the ability to lend itself to finish plating.
Related Specifications
|
CZ115 |
CuZn39AlFeMn |
|
CW722R |
|
Chemical Composition
|
Copper |
56.5-58.5% |
|
Tin |
0.2-0.8% |
|
Lead |
0.5-1.5% |
|
Iron |
0.3-1.0% |
|
Aluminium |
0.1% max |
|
Manganese |
0.5-2.0% |
|
Zinc |
Rem |
|
Others |
0.5% max |
Mechanical Properties (Specification minima 18-80mm)
|
Tensile Strength |
440N/mm2 |
|
0.2% Proof Strength
|
210N/mm2 |
|
Elongation √5.65
|
15% |
Key Features
- Enhanced Strength Levels
- Good corrosion resistance
- Suitable for brazing and soldering
- Excellent hot forming properties
- Very Good machinability rating
- Non-sparking
Typical Physical Properties
|
Melting Point |
940°C |
|
Density |
8.42 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 |
18% IACS |
|
Electrical Resistivity |
0.082 ohm mm2/m |
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 |
Very Good |
|
Brazing |
Very Good |
|
Oxy-acetylene welding |
Not Recommended |
|
Gas-shielded arc welding |
Not Recommended |
|
Resistance welding: Spot and Seam |
Not Recommended |
|
Butt |
Fair |
Typical Uses:
Due to the enhanced mechanical properties and joining properties of CW722R / CZ115 it is utilised in gas valves and fittings, fasteners, pump trim, gears, locks, heavy-duty electrical connectors, transmission components, marine hardware, safety tools and decorative metalwork.
This technical information is given by John Hood & Co.without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.