Description
C69430, known as silicon red brass, is a preferred choice for underground service lines due to its exceptional corrosion resistance in various potable water conditions. This brass alloy possesses moderate strength and maintains excellent spring properties over time. It falls within the category of high-strength brasses. Silicon brasses like C69430 contain less than 20% zinc and less than 6% silicon. They are solid solution strengthened, making them a reliable option for applications that demand both high strength and reasonably high corrosion resistance.
Chemical Composition
Mechanical Properties According To ASTM B371 (As Per Temper HO2)
| Range (Inch) |
From |
To |
UTS Min (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 0.059 | 1.000 | 80 | 40 | 15 | – | – |
| 1.000 | 2.000 | 75 | 35 |
15 | – | – |
| 2.000 | 2.953 | 65 | 35 | 15 | – | – |
| Hex (A/F) | 0.118 | 1.000 | 80 | 40 | 15 | – | – |
| 1.000 | 2.000 | 75 | 35 | 15 | – | – |
| 2.000 | 2.755 | 65 | 35 | 15 | – | – |
| Square (A/F) | 0.118 | 1.000 | 80 | 40 | 15 | – | – |
| 1.000 | 2.000 | 75 | 35 | 15 | – | – |
| 2.000 | 2.362 | 65 | 35 | 15 | – | – |
| Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 | 25 | 550 | 250 | 15 | – | – |
| 25 | 50 | 515 | 240 | 15 | – | – |
| 50 | 75 | 450 | 240 | 15 | – | – |
| Hex (A/F) | 3 | 25 | 550 | 250 | 15 | – | – |
| 25 | 50 | 515 | 240 | 15 | – | – |
| 50 | 70 | 450 | 240 | 15 | – | – |
| Square (A/F) | 3 |
25 | 550 | 250 | 15 | – | – |
| 25 | 50 | 515 | 240 | 15 | – | – |
| 50 | 60 | 450 | 240 | 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 |
70 |
