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

Grade Designation & Standards

Standard Grade: CuSn6 (Phosphor Bronze)

International Equivalents:

  • UNS (USA): C51900

  • EN (Europe): CW453K (CuSn6)

  • JIS (Japan): C5191

Applicable Standards:

  • GB/T 5231-2012 (Wrought Copper Alloys)

  • ASTM B103 (U.S. Strip Standard)

  • EN 12163 (European Standard)


Product Features

1. Ultra-High Elasticity & Fatigue Resistance: Elastic limit ≥500 MPa, fatigue life >1 million cycles, ideal for high-frequency elastic components.

2. Exceptional Wear Resistance: Hardness (HV 150-250) surpasses low-tin bronzes, approaching beryllium bronze performance.

3. Superior Corrosion Resistance: Resists atmospheric, seawater, and weak acid corrosion (corrosion rate ≤0.005 mm/a).

4. Precision Machinability: Supports cold/hot working, welding, and plating; surface finish up to Ra 0.2μm.


Common Product Forms & Dimensions

Product Form

Size Range

Delivery Condition

Strip

Thickness: 0.05-2.0mm, Width ≤600mm

Soft (M), Hard (H)

Rod

Diameter: 5-150mm, Length: 2-6m

Drawn, Hot-Rolled

Wire

Diameter: 0.05-8.0mm

Coiled or Straight

Tube

OD: 3-200mm, Wall Thickness: 0.5-20mm

Cold-Drawn, Half-Hard


Chemical Composition

Element

Content (%)

Function/Limit

Cu

Balance (≥93.5%)

Base material, ensures conductivity and corrosion resistance

Sn

5.5-7.0

Enhances elasticity, wear resistance, and corrosion resistance

P

0.1-0.35

Deoxidizer, refines grain structure, prevents tin segregation

Pb

≤0.02

Strictly controlled to avoid brittleness

Impurities

≤0.1

Ensures high material purity


Physical Properties

Property

Value

Remarks

Density

8.8-8.9 g/cm³

High density for precision parts

Electrical Conductivity

~13% IACS

Suitable for electrical components

Thermal Conductivity

60-70 W/(m·K)

Moderate heat dissipation

Thermal Expansion

17.6×10⁻⁶/°C (20-200°C)

Excellent thermal stability

Melting Point

995-1020°C

Limited castability


Mechanical Properties

Property

Soft (M)

Hard (H04)

Tensile Strength (σb)

400-600 MPa

650-850 MPa

Elongation (δ10)

≥35%

≥5%

Hardness (HV)

90-180

200-300

Elastic Modulus

≥115 GPa

Critical for high-end springs


Core Advantages

1. Optimal Performance Balance: Strength, elasticity, and corrosion resistance tailored for precision industrial applications.

2. Long Service Life: Exceptional fatigue resistance (>1 million cycles).

3. Surface Treatment Compatibility: Supports gold/silver plating, passivation, and coatings.


Product Applications

1. Electronics:

5G Devices: RF connector springs, EMI shielding components.

Semiconductor Testing: Probe card springs, chip contact points.

2. Mechanical Engineering:

Aerospace: Hydraulic valve plates, gyroscope springs (high-pressure and fatigue resistance).

Medical Devices: Endoscope springs, surgical tool joints (biocompatibility requirements).

3. Automotive:

High-Pressure Fuel Systems: Precision springs, sealing rings (corrosion and pressure resistance).

4. Marine Engineering:

Deep-Sea Equipment: Seawater-resistant valves, sensor components (longevity in harsh environments).


Processing Guidelines

1. Annealing: Post-cold working, anneal at 650-750°C for 1-2 hours to relieve stress.

2. Welding: Laser or electron beam welding preferred to minimize heat-affected zone brittleness.

3. Machining: Cutting speed ≤50 m/min; use carbide tools with oil-based coolant.

4. Surface Preparation: Clean surfaces thoroughly before plating to ensure coating adhesion.


Key Application Scenarios

  • Precision Springs: Medical devices, optical instruments.

  • Wear-Resistant Components: Bearings, gears, bushings.

  • Corrosion-Resistant Systems: Seawater desalination plants, chemical valves.


FAQs of CuSn6 Material

Q: How does Cu Sn 6 differ from Cu Sn 5?

A: CuSn6 bronze has higher tin content (5.5-7.0% vs. 4.5-5.5%), offering superior elasticity and wear resistance but at a higher cost.


Q: Is CuSn6 suitable for high-temperature environments?

A: Long-term use is recommended ≤150°C; short-term tolerance up to 250°C. Avoid exceeding 300°C to prevent softening.


Q: How to prevent edge cracking during cold rolling?

A: Limit single-pass deformation to ≤15%, perform stress-relief annealing, and ensure smooth roller surfaces.


Standard References

  • Chemical Composition: GB/T 5231-2012, ASTM B103.

  • Mechanical Testing: EN 12163, JIS H3270 (Rod Standard).

  • Processing: ISO 426-2 (International Manufacturing Guidelines).


Note: Data consolidated from national standards and industry technical documents. Actual performance may vary slightly due to manufacturing processes. Always refer to supplier test reports for precise specifications.