bedra51000
Phosphor Bronze
Characteristics：
bedra51000 is a bronze alloy containing approximately 5% tin and 0.2% phosphorus for deoxidation. The addition of tin increases the strength and corrosion resistance in marine environments. It offers an optimized combination of engineering properties, such as excellent fatigue and spring characteristics, outstanding resistance to stress relaxation, high strength and ductility, coupled with good corrosion resistance.
Typical applications:
This alloy is widely used in spring-loaded conductivity applications, such as springs, contacts, terminals, electrical and electronic connectors. It is also used as fasteners and in wear- and corrosion-resistant parts, such as thrust washers, gears, marine propellers, textile machinery bearings, sleeve bushings, and clutch discs.
Standardization and composition
| UNS | C51000 |
|---|---|
| EN | / |
| JIS | / |
| GB | C51000 (QSn5-0.2) |
| Cu | balance |
| Sn | 4.20-5.80% |
| P | 0.03-0.35% |
| Pb | ≤ 0.05% |
| Fe | ≤ 0.10% |
| Zn | ≤ 0.30% |
Physical properties①
Note①：The testing temperature is 20℃. Note②：The testing temperature range is 20℃ to 300℃.
| Density (g/cm³) | 8.86 |
|---|---|
| Metling temperature (℃) | 1049 |
| Electrical conductivity (%IACS) | 15 |
| Thermal conductivity (W / m x K) | 69.2 |
| Coefficient of thermal expansion② (10-6/K) | 17.1 |
| Modulus of elasticity (GPa) | 110 |
Fabrication Properties
Note③：C36000 = 100%
| Capacity for being cold worked | Excellent |
| Capacity for being hot formed | Poor |
| Brazing | Excellent |
| Resistance welding | Good |
| Machinability rating③ | 20% |
Mechanical Properties
| Temper | Diameter (mm) | Tensile Strength (MPa) | Yield Strength (MPa min.) | Elongation (% min.) | Hardness (HV5 min.) |
|---|---|---|---|---|---|
| H04 | 20≤Φ≤25.4 | 414 | / | 15 | / |
| H04 | 25.4＜Φ≤50 | 380 | / | 18 | / |
Dimension Tolerance and Delivery Form
Note④：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) | Tolerance④ (mm) | Ovality (mm max.) | Length (mm max.) | Straightness (mm/m max.) |
| 20≤Φ＜30 | 0.20 | 0.10 | 3000 | 2.0 |
| 30≤Φ＜50 | 0.30 | 0.15 | 3000 | 3.0 |
| 50≤Φ＜80 | 0.80 | 0.40 | 3000 | 4.0 |
| 80≤Φ≤100 | 1.6 | 0.80 | 2000 | 4.0 |
Other Delivery Forms
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