CW721R
DESCRIPTION
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) |
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 |
Typical Uses
- Gas valves and fittings
- Fasteners
- Pump trim
- Gears
- Locks
- Heavy-duty electrical connectors
- Transmission components
- Marine hardware
- Safety tools and decorative metalwork
- Marine
