CW724R
CW724R: The silicon red brass is specified for underground service lines since it offers great corrosion resistance to all types of potable waters, and has moderate strength and good retention of spring properties. Silicon brasses are part of the subgroup of high strength brasses. Silicon Brass contain less than 20% zinc and less than 6% silicon. The silicon brasses are solid solution strengthened. Silicon brasses are typically chosen because of their high strength and moderately high corrosion resistance.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 75.00 | 77.00 |
| Pb | - | 0.10 |
| Fe | - | 0.30 |
| Sn | - | 0.30 |
| Ni | - | 0.20 |
| Mn | - | 0.05 |
| Al | - | 0.05 |
| P | 0.02 | 0.10 |
| Si | 2.70 | 3.50 |
| Total Others | - | 0.20 |
| Zn | Remainder | |
Mechanical Properties According To CW724R EN12164 (As Per Temper R500)
| Range (mm) | From | To | UTS Min (MPa) | UTS Max (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max | |
|---|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 35 | 75 | 500 | 450 | - | 15 | - | - | |
| Hex (A/F) | 35 | 70 | 500 | 450 | - | 15 | - | - | |
| Square (A/F) | 35 | 60 | 500 | 450 | - | 15 | - | - | |
| Rectangle | Thickness | 35 | 50 | 500 | 450 | - | 15 | - | - |
| PHYSICAL PROPERTIES | |
|---|---|
| Melting Point – Liquidus °F | 1685 |
| Melting Point – Solidus °F | 1510 |
| Density lb/cu in. at 68°F | 0.26 |
| Specific Gravity | 8.19 |
| Electrical Conductivity % IACS at 68°F | 6.2 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 15 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.2 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 16000 |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Spot Weld | Good |
| Seam Weld | Good |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Good |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 80 |
| Machinability Rating | 30 |
TYPICAL USES
- Valve Items