bedra 69300
Silicon Brass
Characteristics：
bedra 69300 is a high-performance, lead-free silicon brass alloy，its strength is comparable to stainless steel, and it is resistant to stress corrosion cracking and dezincification. It is an environmentally friendly material that fully complies with the RoHS and ELV directives, and is widely recognized as an ideal substitute for conventional lead-containing machining brass.
Typical applications:
It is widely used for faucet components, automotive parts, and electrical components, including faucet fittings and sprinkler heads, turbocharger bearings, relief valves, temperature sensors, insert nuts, 2- or 3-way valves, flare nuts, and terminals for air conditioners.
Standardization and composition
| UNS | C69300 |
|---|---|
| EN | CuZn21Si3P (CW724R) |
| GB | HSi75-3 |
| Cu | 73.0-77.0% |
| Si | 2.7-3.4% |
| P | ≤ 0.05-0.1% |
| Pb | < 0.005% |
| Others | < 0.4% |
| Zn | balance |
Physical properties①
Note①：The testing temperature is 20℃. Note②：The testing temperature range is 20℃ to 300℃.
| Density (g/cm³) | 8.3 |
|---|---|
| Metling temperature (℃) | 880 |
| Electrical conductivity (%IACS) | 8 |
| Thermal conductivity (W / m x K) | 38 |
| Coefficient of thermal expansion② (10-6/K) | 18 |
| Modulus of elasticity (GPa) | 104 |
| Dezincification Depth (max.) | 100 |
Fabrication Properties
Note③：C36000 = 100%
| Cold workability | Fair |
| Hot workability | Good |
| Brazing | Forbidden |
| Resistance welding | Good |
| Machinability rating③ | 85% |
Mechanical Properties④
Note④：bedra technical standards
| Diameter (mm) | Temper | Tensile Strength (MPa min.) | Yield Strength (MPa min.) | Elongation (% min.) | Hardness (HV5 min.) |
|---|---|---|---|---|---|
| 3.0 ≤ Ф < 25 | H02 | 515 | 240 | 5 | 160 |
| 25 ≤ Ф ≤ 50 | H02 | 480 | 205 | 10 | 155 |
| 3.0 ≤ Ф < 15 | H04 | 670 | 400 | 6 | 170 |
| 15 ≤ Ф ≤ 40 | H04 | 600 | 300 | 8 | 165 |
Dimension Tolerance and Delivery Form
Note⑤：The tolerances listed in the table are specified as all plus or all minus. When tolerances are specified as plus and minus (±), half the values given.
| Straight bar | ||||
| Diameter (mm) | Tolerance⑤(mm) | Ovality (mm) | Length (mm. max.) | Straightness (mm/m max.) |
| 3.0 ≤ Φ < 10 | 0.04 | 0.020 | 3600 | 0.5 |
| 10 ≤ Φ < 16 | 0.05 | 0.025 | 3600 | 0.5 |
| 16 ≤ Φ < 25 | 0.10 | 0.050 | 4000 | 0.8 |
| 25 ≤ Φ < 35 | 0.12 | 0.060 | 4000 | 0.8 |
| 35 ≤ Φ < 45 | 0.15 | 0.075 | 4000 | 1.0 |
| 45 ≤ Φ < 55 | 0.20 | 0.100 | 4000 | 1.0 |
| 55 ≤ Φ < 80 | 0.30 | 0.150 | 3000 | 1.5 |
| 80 ≤ Φ < 120 | 3.00 | 1.500 | 1500 | 5.0 |
Other Delivery Forms
Profiles
Further product information
PDF Datasheet | EN PDF Datasheet | VI PDF Datasheet | ZH
Please contact us
Sales Asia-Pacific (Excluding-India)
Sales India
Sales North America
Sales Europe
Berkenhoff GmbH (headquarters)
- Kinzenbach plant
- Berkenhoffstrasse 14
- 35452 Heuchelheim
- Germany
- +49 641 601 0
- +49 641 601 222
- info(at)bedra.com
Berkenhoff GmbH
- Merkenbach plant
- Rehmühle 1
- 35745 Herborn
- Germany
- +49 2772 5002 0
- +49 2772 5002 155
- info(at)bedra.com
bedra Vietnam Alloy Material Co., Ltd
- Lot CN-06, Hoa Phu Industrial Park,
Mai Dinh Commune,
Hiep Hoa District, Bắc Ninh Province,
Vietnam
- +84 2043900104
- +84 2043900110
- info-asia(at)bedra.com
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