Description
High Tensile Brass alloys are compositions of Copper and Zinc. CW721R, in particular, belongs to the category of duplex or alpha/beta alloys. This specific brass alloy, CW721R, is recognized for its versatility, offering high strength, excellent hot workability, and machinability, which has led to it occasionally being referred to as either Manganese Bronze or High Tensile Brass in the realm of engineering materials.
Chemical Composition
| Elements |
Min (%) |
Max (%) |
| Cu |
57.00 |
59.00 |
| Pb |
0.80 |
1.60 |
| Sn |
0.20 |
1.00 |
| Fe |
0.20 |
1.20 |
| Al |
0.30 |
1.30 |
| Mn |
0.80 |
1.80 |
| Ni |
– |
0.30 |
| Total others |
– |
0.30 |
| Zn |
Remainder |
Mechanical Properties According To EN12164 CW721R (As Per Temper R440)
| Range (mm) |
From |
To |
UTS Min (N/mm²) |
PS Min (N/mm²) |
ELo Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 40 | 75 | 440 | 180 | 20 | – | – |
| Hex (a/F) | 40 | 60 | 440 | 180 | 20 | – | – |
| Square (A/F) | 40 | 60 | 440 | 180 | 20 | – | – |
| Rectangle (Thickness) | 40 | 50 | 440 | 180 | 20 | – | – |
Physical Properties
| Melting Point | 865°C |
| Density | 8.63g/cm3 |
| Electrical Conductivity | 0.09 x 10-6 Ω.m |
| Thermal Conductivity | 88.3W/m.K |
| Modulus of Elasticity | 96.5 GPa |
Fabrication Properties
| Capacity for being Cold formed | Poor |
| Capacity for being Hot worked | Good |
| Machinability Ration | 30% |
| Resistance to Corrosion | Excellent |
| Suitability for soldering | Excellent |
