C69240
C69240 Spec SheetC69240 silicon red brass is a copper-based alloy strengthened with silicon, offering excellent corrosion resistance, high strength, and good wear properties, making it ideal for heavy-duty mechanical components such as pump parts, valve stems, and bearings.
Chemical Composition
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 71.00 | 72.50 |
| Si | 1.80 | 2.20 |
| Pb | 0.00 | 0.25 |
| Fe | 0.00 | 0.20 |
| Sn | 0.00 | 0.30 |
| Ni | 0.10 | 0.50 |
| Mn | 0.60 | 1.20 |
| P | 0.06 | 0.12 |
| Zn | Remainder | |
Mechanical properties according to ASTM B371 C69240 (as per temper HO2)
| Range (inch) | UTS Min (ksi) |
UTS Max (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness | ||
|---|---|---|---|---|---|---|---|
| Hardness Min (HRB) |
Hardness Max (HRB) |
||||||
| Round (Dia) | 0.059 – 0.500 | 85 | – | 50 | 5 | – | – |
| 0.500 – 1.000 | 70 | – | 35 | 15 | – | – | |
| 1.000 – 2.000 | 70 | – | 30 | 15 | – | – | |
| Hex (A/F) | 0.300 – 0.500 | 85 | – | 50 | 5 | – | – |
| 0.500 – 1.000 | 70 | – | 35 | 15 | – | – | |
| 1.000 – 2.000 | 70 | – | 30 | 15 | – | – | |
| Square (A/F) | 0.300 – 0.500 | 85 | – | 50 | 5 | – | – |
| 0.500 – 1.000 | 70 | – | 35 | 15 | – | – | |
| 1.000 – 2.000 | 70 | – | 30 | 15 | – | – | |
| Rectangle | Thickness: 0.250 – 0.500 | 85 | – | 50 | 5 | – | – |
| Width: 0.5000 – 1.000 | |||||||
| Thickness: 0.500 – 1.000 | 70 | – | 35 | 15 | – | – | |
| Width: 1.000 – 2.000 | |||||||
| Thickness: 1.000 – 2.000 | 70 | – | 30 | 15 | – | – | |
| Width: 2.000 – 3.000 | |||||||
| Range (mm) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 1.5 | 12 | 585 | – | 345 | 5 | – | – |
| 12 | 25 | 480 | – | 240 | 15 | – | – | |
| 25 | 50 | 480 | – | 205 | 15 | – | – | |
| Hex (A/F) | – | 12 | 585 | – | 345 | 5 | – | – |
| 12 | 25 | 480 | – | 240 | 15 | – | – | |
| 25 | 50 | 480 | – | 205 | 15 | – | – | |
| Square (A/F) | – | 12 | 585 | – | 345 | 5 | – | – |
| 12 | 25 | 480 | – | 240 | 15 | – | – | |
| 25 | 50 | 480 | – | 205 | 15 | – | – | |
| Rectangle | Thickness | 6 – 12 | 585 | – | 345 | 5 | – | – |
| Width | 12 – 25 | |||||||
| Thickness | 12 – 25 | 480 | – | 240 | 15 | – | – | |
| Width | 25 – 50 | |||||||
| Thickness | 25 – 50 | 480 | – | 205 | 15 | – | – | |
| Width | 50 – 75 | |||||||
| PHYSICAL PROPERTIES | |
|---|---|
| Density | ~8.4 g/cm³ |
| Melting Range | ~950–1000 °C |
| Elastic (Young’s) Modulus | ~110 GPa (16 × 10⁶ psi) |
| Shear Modulus | ~42 GPa (6.1 × 10⁶ psi) |
| Thermal Conductivity | Lower than pure copper (~50–150 W/m K) |
| Electrical Conductivity | Moderately low compared to pure copper |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Strength & Wear Resistance | Excellent |
| Corrosion Resistance | Excellent |
| Machinability | Moderate (~75% relative to free-cutting brass) |
| Hot Working | Excellent |
| Cold Working | Poor |
Typical Uses
Pump components (impellers, housings)
Valve stems and fittings
Bearings and bushings
