Bronze CuSn5ZnPb Bushing
Bronze CuSn5ZnPb Bushing
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ALLOY SPECIFICATION, Bronze bearings CuSn5Pb5Zn5 With Shoulder (Flanged Bushing) and Without Shoulder (Plain Bearing)
Alloy: CuSn5Zn5Pb5 (CC491K EN 1982)
ALLOY SPECIFICATION: CuSn5Zn5Pb5 (CC491K EN 1982) Bronze Bushings
Composition
- Primary Elements:
- Copper (Cu): ~85% (balance)
- Tin (Sn): 4–6%
- Lead (Pb): 4–6%
- Zinc (Zn): 4–6%
- Standard: EN 1982:2008 (European standard for cast copper alloys).
Key Properties
- Mechanical:
- Tensile Strength: ~200–250 MPa (typical for cast alloy)
- Yield Strength: ~100–150 MPa
- Hardness: 70–90 HB (Brinell)
- Elongation: 10–15% (moderate ductility)
- Functional:
- Self-Lubricating: Lead (Pb) acts as a solid lubricant, reducing friction in bearings.
- Wear Resistance: Tin (Sn) enhances hardness and load-bearing capacity.
- Machinability: Excellent due to lead content.
- Corrosion Resistance: Moderate (zinc improves resistance to oxidation).
Applications
- Typical Uses:
- Bushings, plain bearings, thrust washers (especially in low-lubrication environments).
- Industrial machinery, automotive components, pumps, and marine equipment.
- Design Variants:
- With Shoulder (Flanged Bushing): Provides axial load support and ease of installation. Common in pulleys or gears.
- Without Shoulder (Plain Bearing): Used in radial load applications, e.g., rotating shafts.
Manufacturing Considerations
- Casting Method: Typically sand-cast or continuous-cast.
- Machining: Easily machined due to lead content; suitable for complex shapes.
- Dimensional Standards: Complies with ISO or EN specifications for bushings (e.g., ISO 3547 for wrapped bushes).
Standards & Equivalents
- EN 1982: CC491K (CuSn5Zn5Pb5).
- Similar Alloys:
- UNS C93700 (USA): Leaded tin bronze (80% Cu, 10% Pb, 10% Sn).
- DIN 1705: LG5 (German equivalent).
Environmental Notes
- Contains lead (Pb), which may restrict use in some eco-regulated applications (e.g., RoHS). Verify compliance with local regulations.
Advantages for Bushings
- Low friction and reduced wear due to lead inclusion.
- Suitable for high-load, low-speed applications.
- Cost-effective for mass production via casting.
Let me know if you need details on dimensional tolerances or testing standards!
1. Requirements
Note: Mechanical property requirements apply to sizes up to and including 300 mm in external diameter. For larger continuous castings, specifications should be agreed between the supplier and the purchaser.
Mechanical Properties
| Casting Process | Tensile Strength Rm (MPa) | Yield Strength 0.2% Rp0,2 (MPa) | Elongation 5D A (%) | Hardness HBW (10-1000) |
|---|---|---|---|---|
| Centrifugal (GZ) | 250 | 110 | 13 | 65 |
2. Equivalent Specifications
Europe
- Standard: BS 1400, DIN 1705, NFA 53707
- Alloy: LG2, CuSn5ZnPb (Rg5), UE5
USA
- Standard: ASTM B505, ASTM B271
- Alloy: C83600 (SAE 40)
Australia
- Standard: AS 1565
- Alloy: C83600A
Japan
- Standard: JIS H5121, JIS H5120
- Alloy: CAC406C (BC6), CAC406
ISO
- Standard: 1338
- Alloy: CuSn5Pb5Zn5
3. Optional Heat Treatments at Customers’ Request
- Stress Relieve
4. Technical Characteristics
- Good machining properties.
- Good self-lubricating properties.
- Corrosion resistant.
- Working temperature should not exceed 200°C / 392°F.
Exploring the Versatility and Durability of RG5 Tin Bronze Alloy: The Ideal Choice for Gunmetal Bearing Bushings with Self-Lubricating Graphite Plugs
In the realm of industrial machinery and components, selecting the right material can dramatically influence performance, longevity, and efficiency. One standout material that has consistently proved its worth is the RG5 tin bronze alloy, known for its robust properties and suitability for gunmetal bearing bushings with self-lubricating graphite plugs. This post delves into the specifics of the RG5 alloy, often designated as CuSn5ZnPb, and its applications in creating high-performance bearing bushings.
What is RG5 Tin Bronze Alloy?
RG5 tin bronze, or CuSn5ZnPb, is a type of gunmetal that blends copper, tin, zinc, and lead. This composition provides a balanced mix of strength, corrosion resistance, and excellent machinability, making it a preferred choice for various casting applications. The inclusion of tin enhances the alloy’s strength and wear resistance, which are critical for components subjected to high loads and speeds.
Characteristics of RG5 Alloy
- Durability: The RG5 alloy withstands moderate to high loads and can perform under the stress of heavy wear conditions without compromising its structural integrity.
- Corrosion Resistance: This alloy offers excellent resistance to corrosion in environments involving water and steam, making it ideal for maritime and plumbing applications.
- Machinability: RG5 tin bronze is highly regarded for its ease of machining, allowing for the precise creation of complex parts without sacrificing surface finish.
- Versatility: It can be used in a wide range of temperatures, maintaining its properties and performance across diverse operating conditions.
The Role of Self-Lubricating Graphite Plugs
Integrating self-lubricating graphite plugs into RG5 bronze bushings is a game-changer for industries reliant on mechanical systems. These graphite plugs are embedded into the surface of the bronze bushings and act as a constant source of lubrication, significantly reducing the need for manual lubrication and enhancing the component’s lifespan.
- Reduced Friction: Graphite has natural lubricative properties, which help in minimizing friction between moving parts, thus reducing wear and extending the service life of the bushing.
- Maintenance Reduction: With self-lubrication, the frequency of maintenance and downtime required for machinery is significantly decreased, boosting productivity and reducing costs.
- Performance in Extreme Conditions: These bushings perform reliably in high-temperature environments where traditional lubricants might fail, ensuring uninterrupted operation.
Applications of RG5 Tin Bronze Alloy in Industry
RG5 bronze bushings with graphite plugs are extensively used in applications requiring robust performance under high loads and variable speeds. Common applications include:
- Heavy Machinery: Used in construction and mining equipment where exposure to dirt and abrasive particles is common.
- Marine Applications: Ideal for components exposed to marine environments, such as ship propellers and pump components.
- Automotive Industry: Employed in components like suspension systems and pump fittings that require high resistance to wear and fatigue.
Conclusion
The RG5 tin bronze alloy, particularly when utilized for bearing bushings with self-lubricating graphite plugs, represents a superior choice for industries seeking reliable and efficient components. Its excellent mechanical properties, combined with the added efficiency of graphite plugs, provide a solution that is both cost-effective and high-performing. As industries continue to evolve, the demand for materials that offer both durability and efficiency remains paramount, and RG5 tin bronze stands out as a material that can meet these demands effectively.
By incorporating RG5 tin bronze bearing bushings in your machinery, you not only ensure optimal performance but also contribute to a sustainable operation model by reducing the need for frequent maintenance and component replacement.
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