C51000 Alloy / C510 Phosphor Bronze
C51000 Alloy / C510 Phosphor Bronze
At conexmetals.com, we supply C51000 Phosphor Bronze (C510 Alloy) – a high-quality copper-tin-phosphorus alloy known for its excellent corrosion resistance, electrical conductivity, and moderate strength. This alloy is ideal for electrical connectors, springs, bearings, bushings, and marine components where reliability and durability are essential.
C51000 is widely used in precision engineering, marine hardware, electrical and industrial equipment, thanks to its balance of machinability, corrosion resistance, and mechanical performance.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Copper (Cu + Named Elements) | 99.5 | Rem |
| Tin (Sn) | 4.0 | 6.0 |
| Phosphorus (P) | 0.03 | 0.35 |
| Lead (Pb) | – | 0.35 |
| Zinc (Zn) | – | 1.0 |
| Iron (Fe) | – | 0.15 |
Key Notes:
Tin enhances corrosion resistance and mechanical strength.
Phosphorus improves wear resistance and fatigue strength.
Small amounts of lead improve machinability, making it suitable for precision components.
Mechanical Properties (Typical at 20°C)
| Form | Temper | Code | Tensile Strength (ksi) | Yield Strength 0.5% (ksi) | Elongation (%) | Hardness |
|---|---|---|---|---|---|---|
| Rod / Wire | Half Hard | H02 | 50 | 35 | 30 | 60 HB |
| Rod / Wire | Hard | H04 | 65 | 50 | 20 | 75 HB |
| Flat Products | Spring | H08 | 90 | 70 | 5 | 85 HB |
Insights:
Suitable for components under moderate mechanical stress.
Retains shape under long-term loading.
Excellent for electrical and precision parts.
Physical Properties
| Property | Value |
|---|---|
| Melting Point | 1750–1800°F |
| Density | 0.32 lb/cu in |
| Specific Gravity | 8.9 |
| Electrical Conductivity | 18–20% IACS |
| Thermal Conductivity | 50 Btu/sq ft/ft/hr/°F |
| Thermal Expansion | 9.6 × 10⁻⁶ /°F |
| Modulus of Elasticity | 15,000 ksi |
| Modulus of Rigidity | 5,500 ksi |
Notes:
Excellent electrical conductivity makes it ideal for connectors.
Thermal stability ensures minimal expansion under temperature variations.
Fabrication & Machining
| Process | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Good |
| Cold Working | Good |
| Machinability | 75–80% Rating |
| Welding | Not Recommended |
Tips:
Use standard bronze machining techniques.
Avoid high-heat welding; brazing is preferred.
Annealing restores ductility after cold working.
Thermal Treatment
| Process | Min Temp (°F) | Max Temp (°F) |
|---|---|---|
| Annealing | 850 | 1200 |
Benefits:
Enhances ductility and workability.
Reduces internal stresses after cold working.
Applications
C51000 Phosphor Bronze is ideal for:
Electrical connectors & contacts
Springs & precision components
Bearings & bushings
Marine components
Industrial machinery
Key Advantages:
Corrosion-resistant in harsh and marine environments
Good electrical conductivity for reliable performance
Moderate strength with excellent machinability
Applicable Standards
ASTM B103/B103M – Plate, Sheet, Strip
ASTM B139/B139M – Rod, Bar, Shapes
SAE J461/J463 – Wrought Copper Alloys
AMS 4520 – Cold Rolled Bronze Strip
MIL-B-13501 – Bearings & Bushings
