bearing bushes bronze brass
bearing bushes bronze brass1

CuSn10 Tin Bronze Alloy Bearing Bushing

International Standards:

The closest international standards for CuSn10 tin bronze alloy are ASTM B505 C90700 and C92700.

Chemical Composition

Element % Min % Max
Cu (including Ni) 88.0 90.0
Ni – 2.0
P – 0.2
Pb – 1.0
Sn 9.0 11.0
Al – 0.01
Fe – 0.2
Mn – 0.10
S – 0.05
Sb – 0.2
Si – 0.02
Zn – 0.5

Mechanical Properties (Minimum Values)

Property Continuous Casting (GC)¹ Centrifugal Casting (GZ)
Tensile Strength (Rm, MPa) 280 280
Yield Point 0.2% (Rp0.2, MPa) 170 160
Elongation 5D (A, %) 10 10
Hardness (HBW 10-1000) 80 80

¹ The mechanical property requirements apply to sizes up to and including 300 mm external diameter. For larger continuous castings, the mechanical properties should be agreed upon between the supplier and the purchaser.

Physical Properties

Property Value
Density (kg/dm³) 8.7
Specific Heat (J/(g·K)) 0.376
Thermal Expansion (10⁻⁶/K) 18.5
Thermal Conductivity (W/(m·K)) 59
Electrical Conductivity (MS/m) 7.0

Verification of Information:

The provided information aligns with typical specifications for CuSn10 tin bronze alloy. However, for precise applications, it is recommended to cross-check with the latest ASTM B505 standards or consult the material supplier for exact composition and properties.

CuSn10 tin Bronze Bearings

CuSn10 is a type of tin bronze alloy commonly used in the manufacturing of bearing bushings due to its excellent mechanical properties, wear resistance, and corrosion resistance. Here’s an overview of CuSn10 tin bronze alloy and its application in bearing bushings:

  • Composition:

    • Copper (Cu): ~90%

    • Tin (Sn): ~10%

    • Trace amounts of other elements like phosphorus (P), zinc (Zn), and lead (Pb) may be present to enhance specific properties.

  • Key Properties:

    1. High Strength and Hardness: CuSn10 offers good mechanical strength and hardness, making it suitable for heavy-load applications.

    2. Wear Resistance: The alloy exhibits excellent wear resistance, which is crucial for bearing bushings subjected to friction and sliding contact.

    3. Corrosion Resistance: Tin bronze is resistant to corrosion, especially in marine and industrial environments.

    4. Low Friction Coefficient: The alloy has a low coefficient of friction, reducing wear and energy loss in moving parts.

    5. Good Machinability: CuSn10 can be easily machined into precise shapes and sizes for bearing bushings.

    6. Thermal Conductivity: It has good thermal conductivity, helping to dissipate heat generated during operation.

  • Applications in Bearing Bushings:

    Bearing bushings made from CuSn10 are widely used in various industries, including:

    • Marine: In propeller shafts, rudder bearings, and other components exposed to seawater.
    • Industrial Machinery: For heavy-duty equipment, pumps, and hydraulic systems.

Advantages of CuSn10 Bearing Bushings:

  • Durability: Long service life even under high loads and harsh conditions.

  • Self-Lubricating: In some cases, the alloy can operate with minimal lubrication.

  • Cost-Effective: Provides a balance of performance and cost compared to other high-performance alloys.

Manufacturing Process:

CuSn10 bearing bushings are typically manufactured through:

  1. Casting: Sand casting or centrifugal casting to produce near-net shapes.

  2. Machining: Precision machining to achieve the required dimensions and surface finish.

  3. Heat Treatment: Optional heat treatment to enhance mechanical properties.

Maintenance:

  • Regular lubrication is recommended to minimize wear and extend the life of the bushing.

  • Periodic inspection for wear and corrosion is essential, especially in demanding environments.

In summary, CuSn10 tin bronze alloy is a reliable material for bearing bushings, offering a combination of strength, wear resistance, and corrosion resistance suitable for a wide range of applications.