C51000 Bronze

Grade Name

C51000 (UNS C51000, ASTM B103/139/159, ISO CuSn5)
Commonly known as phosphor bronze alloy 510, containing 5% tin and a trace of phosphorus.

Product Features

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.

Common Product Forms & Dimensions

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

C51000 Chemical Composition

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

C51000 Phosphor Bronze Properties

Physical Properties

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)

Mechanical Properties

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

Core Advantages

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.

Product Applications

Electronics: Connectors, terminals, relay springs.
Automotive: Bushings, bearings, clutch components.
Industrial: Bellows, diaphragms, fasteners.
Marine: Corrosion-resistant fittings and valves.

Processing Guidelines

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.

Key Application Scenarios

High-reliability electrical contacts in aerospace systems.
Precision springs in medical devices.
Corrosion-resistant marine hardware.

FAQs

Q1: Can C51000 be used in high-temperature environments?

A: Limited to ≤150°C; prolonged exposure reduces strength.

Q2: How does C51000 compare to brass in conductivity?

A: Lower conductivity (~15% IACS) than brass (~28% IACS) but superior mechanical properties.

Q3: Is C51000 suitable for seawater applications?

A: Yes, due to excellent corrosion resistance.

Standards & References

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.