CuSn11Pb2-C is a tin-reinforced, lead-lubricated cast bronze that combines wear resistance, easy processing and corrosion resistance. It is widely used in mechanical wear-resistant parts such as bearings and gears.

1. Material Composition

• Base Metal: Copper (Cu), approximately 86–87%.

• Alloying Elements:

Tin (Sn): ~11%, enhances strength, hardness, and wear resistance.

Lead (Pb): ~2%, improves machinability and anti-friction performance.

Others: May contain small amounts of zinc (Zn), nickel (Ni), etc., depending on applicable standards.

2. Standards and Specifications

• DIN 17660 (Germany): Defines chemical composition and performance requirements for CuSn11Pb2-C.

• EN 1982 (Europe): Applies to copper alloy castings and may cover this material.

• Other Standards: May also comply with ISO or specific industry standards (e.g., marine or automotive applications).

3. Physical Properties

• Density: ~8.8 g/cm³ (slightly less than pure copper at 8.96 g/cm³).

• Melting Point: Approximately 850–1000°C.

• Thermal/Electrical Conductivity: Lower than pure copper, but superior to many other copper alloys.

4. Mechanical Properties

• Tensile Strength: ~200–300 MPa in as-cast condition; can exceed 400 MPa after cold working.

• Elongation: 10–20% in as-cast; may reduce to 5–10% after cold working.

• Hardness: Brinell hardness (HB) around 80–120 depending on processing condition.

• Wear Resistance: Excellent; suitable for high-friction environments.

5. Corrosion Resistance

• General Environment: Resists atmospheric and seawater corrosion, suitable for marine and chemical equipment.

• Limitations: Lead may reduce corrosion resistance in acidic or ammonia-rich environments—avoid such conditions.

6. Processing Characteristics

• Machinability: Significantly enhanced by lead content—ideal for precision parts.

• Weldability: Poor; lead increases the risk of hot cracking, requiring special welding techniques (e.g., brazing).

• Formability: Good cold working capability, suitable for rolling, heading, etc.

7. Applications

• Typical Uses:

Bearings and bushings – for wear resistance and self-lubrication.

Valve and pump parts – corrosion- and pressure-resistant.

Gears and transmission components – for high-load, wear-intensive conditions.

Pipe fittings – especially in marine and chemical systems.

• Industries: Automotive, marine, chemical equipment, mechanical engineering, and more.

8. Comparison with Other Copper Alloys

• Versus CuSn8 (Tin Bronze): Higher tin content provides increased strength but at a higher cost.

• Versus CuZn39Pb3 (Leaded Brass): Better corrosion resistance, though slightly inferior machinability.

• Advantages: Balanced wear resistance, corrosion resistance, and processability for complex environments.

• Limitations: Lead content restricts use in eco-sensitive applications.

9. Environmental Considerations & Alternatives

• Regulatory Impact: Lead toxicity is regulated by RoHS; restricted in electronic and potable water systems in regions like the EU.

• Substitutes: Lead-free bronzes such as CuSn12-Ni, or bismuth (Bi)/silicon (Si)-modified alloys.

10. Meaning of the "-C" Suffix

Condition Indicator: Typically designates the material condition, such as Cold Worked; exact interpretation depends on the relevant standard.

11. Summary

CuSn11Pb2-C stands out for its excellent wear resistance, machinability, and corrosion resistance, securing its place in traditional industrial applications. However, in light of tightening environmental regulations, its usage is gradually shifting toward lead-free alternatives. Material selection must strike a balance between performance requirements and regulatory compliance to ensure suitability for specific industries.

12. About Suzhou Bolaibao Metal

Suzhou Bolaibao Metal specializes in the development, processing, and customization of non-ferrous metal materials. We provide a stable, long-term supply of high-quality CuSn11Pb2-C casting bronze, widely used in construction machinery, marine equipment, chemical piping, and automotive manufacturing.

We offer:

• Expert material selection and technical support
  

• Custom machining and dimensional precision
  

• Ample inventory and prompt delivery
  

• Comprehensive after-sales service

Contact us for detailed information and tailored solutions!
Tel: +86 15366282159
Email: sale@bolaibao1.com
Website: www.blbszmetal.com