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C51000 (UNS C51000, ASTM B103/139/159, ISO CuSn5)
Commonly known as phosphor bronze alloy 510, containing 5% tin and a trace of phosphorus.
High strength, excellent fatigue resistance, and corrosion resistance.
Superior electrical and thermal conductivity.
Good formability and spring properties.
Resistant to wear and stress relaxation.
Suitable for precision machining and cold working.
Product Form | Thickness/Diameter (mm) | Width (mm) | Length (mm) |
Sheet/Strip | 0.1 – 6.0 | 10 – 600 | Custom |
Rod | 3.0 – 50.0 | - | 1000 – 6000 |
Wire | 0.5 – 12.0 | - | Custom |
Tube | OD: 5.0 – 100.0 | - | Custom |
Element | Cu | Sn | P | Zn | Pb | Fe | Others |
Content | Bal. | 4.2–5.8 | 0.03–0.35 | ≤0.30 | ≤0.05 | ≤0.10 | ≤0.15 |
Property | Value |
Density (g/cm³) | 8.86 |
Melting Range (°C) | 1010 – 1045 |
Thermal Conductivity (W/m·K) | 75 |
Electrical Conductivity (% IACS) | 15 |
Coefficient of Thermal Expansion (10⁻⁶/°C) | 18.2 (20–300°C) |
Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HV) |
Annealed (O) | 325 – 380 | 125 – 180 | 45 – 60 | 70 – 90 |
Cold Worked (H04) | 520 – 620 | 450 – 550 | 10 – 20 | 150 – 180 |
Retains mechanical properties under cyclic loads.
Excellent resistance to corrosion in marine/chemical environments.
Ideal for high-stress, high-flex applications.
Low friction coefficient and anti-galling properties.
Electronics: Connectors, terminals, relay springs.
Automotive: Bushings, bearings, clutch components.
Industrial: Bellows, diaphragms, fasteners.
Marine: Corrosion-resistant fittings and valves.
Machining: Use sharp tools with slow speeds and adequate lubrication.
Forming: Anneal before severe cold working to prevent cracking.
Welding: Not recommended due to phosphorus content; use soldering/brazing instead.
Heat Treatment: Stress-relieving at 200–300°C for 1–2 hours.
High-reliability electrical contacts in aerospace systems.
Precision springs in medical devices.
Corrosion-resistant marine hardware.
A: Limited to ≤150°C; prolonged exposure reduces strength.
A: Lower conductivity (~15% IACS) than brass (~28% IACS) but superior mechanical properties.
A: Yes, due to excellent corrosion resistance.
ASTM: B103 (springs), B139 (rod), B159 (wire).
ISO: 427 (wrought copper-tin alloys).
EN: CW450K (European designation).
Note: Values are typical and may vary based on processing. Confirm specifications with material test reports.
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