C69400
C69400 Spec SheetAlloy C69400, known as Silicon Red Brass, is a high-strength, corrosion-resistant copper-zinc-silicon alloy widely used in plumbing, marine, and industrial applications. It offers excellent resistance to dezincification, good machinability, and durability in harsh environments.
Chemical Composition
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 80.00 | 83.00 |
| Si | 3.50 | 4.50 |
| Pb | 0.00 | 0.30 |
| Fe | 0.00 | 0.20 |
| Zn | Remainder | |
Mechanical properties according to ASTM B371 C69400 (as per temper HO4)
| Range (inch) | UTS Min (ksi) |
UTS Max (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness | ||
|---|---|---|---|---|---|---|---|
| Hardness Min (HRB) |
Hardness Max (HRB) |
||||||
| Round (Dia) | 0.250 – 1.000 | 85 | – | 40 | 15 | – | – |
| 1.000 – 2.000 | 70 | – | 35 | 15 | – | – | |
| 2.000 – 3.000 | 65 | – | 35 | 15 | – | – | |
| Hex (A/F) | 0.250 – 1.000 | 85 | – | 40 | 15 | – | – |
| 1.000 – 2.000 | 70 | – | 35 | 15 | – | – | |
| 2.000 – 3.000 | 65 | – | 35 | 15 | – | – | |
| Square (A/F) | 0.250 – 1.000 | 85 | – | 40 | 15 | – | – |
| 1.000 – 2.000 | 70 | – | 35 | 15 | – | – | |
| 2.000 – 3.000 | 65 | – | 35 | 15 | – | – | |
| Rectangle | Thickness: 0.250 – 1.000 | 85 | – | 40 | 15 | – | – |
| Width: 1.000 – 2.000 | |||||||
| Thickness: 1.000 – 2.000 | 70 | – | 35 | 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) | 6 | 25 | 550 | – | 250 | 15 | – | – |
| 25 | 50 | 515 | – | 240 | 15 | – | – | |
| 50 | 75 | 450 | – | 240 | 15 | – | – | |
| Hex (A/F) | 6 | 25 | 550 | – | 250 | 15 | – | – |
| 25 | 50 | 515 | – | 240 | 15 | – | – | |
| 50 | 75 | 450 | – | 240 | 15 | – | – | |
| Square (A/F) | 6 | 25 | 550 | – | 250 | 15 | – | – |
| 25 | 50 | 515 | – | 240 | 15 | – | – | |
| 50 | 75 | 450 | – | 240 | 15 | – | – | |
| Rectangle | Thickness | 6 – 25 | 550 | – | 250 | 15 | – | – |
| Width | 25 – 50 | |||||||
| Thickness | 25 – 50 | 515 | – | 240 | 15 | – | – | |
| Width | 50 – 75 | |||||||
| PHYSICAL PROPERTIES | |
|---|---|
| Melting Point – Liquidus °F | 1685 °F |
| Melting Point – Solidus °F | 1510 °F |
| Density | 0.296 lb/in³ at 68 °F / 8.19 g/cm³ |
| Electrical Conductivity | 6.2% IACS at 68 °F |
| Thermal Conductivity | 15 Btu/sq. ft/ft hr/°F at 68 °F |
| Coefficient of Thermal Expansion 68–572 | 11.2 · 10⁻⁶ per °F (68–572 °F) |
| Specific Heat Capacity | 0.09 Btu/lb/°F at 68 °F |
| Modulus of Elasticity in Tension | 16000 ksi |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Hot Forming | Excellent |
| Soldering | Excellent |
| Brazing | Excellent |
| Forgeability | Good |
| Machinability | Fair |
| Cold Working | Poor |
Typical Uses
Valves
Faucets
Propellers
shafts
fasteners
Plumbing
Sanitary Fittings
