Ningbo Jintian Copper (Group) Co., Ltd.
Ningbo Jintian Copper (Group) Co., Ltd.
Bronze

C51000 Bronze

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.


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