CuSn8 Phosphor Bronze

Grade Designation & Standards

Standard Grade: CuSn8 (Phosphor Bronze)

International Equivalents:

• UNS (USA): C52100

• EN (Europe): CW454K

• JIS (Japan): C5212

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 & Wear Resistance: Elastic limit ≥600 MPa, Vickers hardness (HV 200-300), suitable for extreme-load applications.

2. Superior Corrosion Resistance: Resists seawater, weak acids, and high-temperature oxidation (corrosion rate ≤0.003 mm/a).

3. Precision Machinability: Supports cold rolling, welding, and plating; surface finish up to Ra 0.1μm.

Common Product Forms & Dimensions

Product Form	Size Range	Delivery Condition
Strip	Thickness: 0.05-1.5mm, Width ≤500mm	Soft (M), Hard (H)
Rod	Diameter: 3-120mm, Length: 2-6m	Drawn, Hot-Rolled
Wire	Diameter: 0.05-6.0mm	Coiled or Straight
Tube	OD: 2-150mm, Wall Thickness: 0.3-15mm	Cold-Drawn, Half-Hard

Chemical Composition

Element	Cu	Sn	P	Pb	Impurities
Content (%)	Balance (≥90.7%)	7.0-9.0	0.1-0.3	≤0.02	≤0.1

Physical Properties

Property	Value	Remarks
Density	8.8-8.9 g/cm³	High density for precision parts
Electrical Conductivity	12% IACS	Suitable for industrial applications
Thermal Conductivity	50-60 W/(m·K)	Moderate heat dissipation
Thermal Expansion	17.2×10⁻⁶/°C (20-200°C)	Excellent thermal stability
Melting Point	990-1025°C	Limited castability

Mechanical Properties

Property	Soft (M)	Hard (H04)
Tensile Strength (σb)	550-750 MPa	800-1000 MPa
Elongation (δ10)	≥30%	≥2%
Vickers Hardness (HV)	100-200	250-350
Elastic Modulus	≥120 GPa	Critical for high-end springs

Core Advantages

1. Extreme-Load Adaptability: Industry-leading tensile strength and elastic limit.

2. Longevity & Reliability: Fatigue resistance exceeds 1 million cycles.

3. Multi-Functional Surface Treatment: Compatible with gold plating, DLC coating, etc.

Product Applications

1. Aerospace: Engine valve plates, landing gear springs.

2. Medical Devices: Implantable springs, surgical robot joints.

3. Energy Industry: Nuclear reactor seals, deep-sea drilling components.

Processing Guidelines

1. Annealing: Post-cold working, anneal at 700-750°C for 1-2 hours.

2. Welding: Prefer laser welding to minimize porosity.

3. Machining: Cutting speed ≤40 m/min; carbide tools required.

Key Application Scenarios

• High-Temperature & High-Pressure Systems: Petrochemical valves.

• Precision Optics: Space telescope mounts.

FAQs of CuSn8 Bronze

Q: How does Cu Sn 8 differ from Cu Sn 6?

A: CuSn8 has higher tin content (7%-9%), significantly improving strength and wear resistance but at a higher cost.

Q: Is CuSn8 suitable for cryogenic environments?

A: Yes, it maintains stable performance at -200°C.

Standard References

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

• Mechanical Testing: EN 12163, JIS H3270.

• Processing: ISO 426-2, Aerospace Standard AMS 4590.

Note: Data consolidated from industrial standards. Actual values may vary slightly due to manufacturing processes. Refer to supplier test reports for precise specifications.