High Tensile Brass are alloys of Copper and Zinc. CW721R is a duplex or alpha/beta alloy. Brass alloy CW 721R is a versatile high strength, hot workable, machinable engineering alloy sometimes referred to as a Manganese Bronze or High Tensile Brass.
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) |
UTS Max (N/mm2) |
PS Min (N/mm2) |
Elongation 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 |
| Technique |
Suitability |
| Capacity for being Cold formed |
Poor |
| Capacity for Being Hot Worked |
Good |
| Machinability Ration |
30% |
| Resistance to Corrosion |
Excellent |
| Suitability for Soldering |
Excellent |
