bearing bushes bronze brass
bearing bushes bronze brass1

CuSn12 Tin Bronze Alloy Bearing Bushing

CuSn12 is a bronze alloy with a high tin content, known for its excellent mechanical properties, corrosion resistance, and performance under high loads and pressures. Below is a summary of its key characteristics based on the provided information:

Chemical Composition

Element % Min % Max
Cu 85.0 88.5
Ni – 2.0
P – 0.60
Pb – 0.70
Sn 11.0 13.0
Al – 0.01
Fe – 0.2
Mn – 0.2
S – 0.05
Sb – 0.15
Si – 0.01
Zn – 0.5

Note: For continuous and centrifugal castings, the minimum tin content is 10.5%, and the maximum copper content is 89.0%.

Mechanical Properties

Property Continuous Casting (GC) Centrifugal Casting (GZ)
Tensile Strength (Rm, MPa) 300 280
Yield Point 0.2% (Rp0.2, MPa) 150 150
Elongation 5D (A, %) 6 5
Hardness (HB) 90 90

Note: Mechanical properties for continuous castings apply to sizes up to 300 mm external diameter. For larger castings, properties should be agreed upon between supplier and purchaser.

Physical Properties

Property Value
Density (kg/dm³) 8.6
Specific Heat (J/(g·K)) 0.376
Thermal Expansion (10⁻⁶/K) 18.5
Thermal Conductivity (W/(m·K)) 54
Electrical Conductivity (MS/m) 6.2

Key Features

  1. Hard and Tough Material: Suitable for applications requiring high strength and durability.
  2. Corrosion Resistance: Excellent resistance to corrosion, making it ideal for harsh environments.
  3. Impact and Cavitation Resistance: Performs well under mechanical stress and cavitation conditions.
  4. High Load and Pressure Performance: Maintains integrity under heavy loads and pressures.

International Standards

  • ASTM B505 C90700: U.S. standard for CuSn12.
  • DIN 1705 CuSn12: German standard for CuSn12.

This alloy is widely used in industries such as marine engineering, pump manufacturing, and heavy machinery due to its robust properties.

CuSn12 tin Bronze Bearings

CUSN12 tin bronze is a widely used material in various industrial applications due to its excellent combination of properties. Below is a summary of its key applications and the reasons for its suitability:

1. Bearings

  • Applications: Industrial bearings, bearings for heavy loads and relatively low speeds.

  • Reasons:

    • Corrosion Resistance: Suitable for environments where corrosion is a concern.

    • Friction & Wear Properties: Low coefficient of friction and high wear resistance, making it ideal for bearing surfaces.

    • Mechanical Properties: Moderate strength ensures durability under load.

2. Gear Boxes

  • Applications: Gear boxes, gears, worm gears, worm wheels.

  • Reasons:

    • Corrosion Resistance: Good resistance to corrosion, extending the lifespan of components.

    • Friction & Wear Properties: Low friction and high wear resistance, essential for gear efficiency and longevity.

    • Machining Properties: Good machinability allows for precise manufacturing of gear components.

    • Mechanical Properties: Moderate strength ensures gears can handle operational stresses.

    • Pressure Tight: Can withstand pressures up to 260°C, making it suitable for high-temperature environments.

3. Restaurant Equipment

  • Applications: Various components in restaurant equipment.

  • Reasons:

    • Appearance: Aesthetically pleasing, which is important for visible components.

    • Corrosion Resistance: Resistant to fresh water, saline solutions, and numerous environments, making it suitable for kitchen and food service applications.

    • Machining Properties: Good machinability for custom parts.

    • Mechanical Properties: Moderate strength for durability.

    • Pressure Tight: Can withstand high temperatures, useful in cooking equipment.

4. Speed Reducers

  • Applications: Speed reducers.

  • Reasons:

    • Corrosion Resistance: Protects against environmental degradation.

    • Friction & Wear Properties: Low friction and high wear resistance, crucial for efficient operation.

    • Mechanical Properties: Moderate strength ensures reliability under load.

5. Valve Bodies

  • Applications: Valve bodies.

  • Reasons:

    • Friction & Wear Properties: High wear resistance, important for sealing surfaces.

    • Mechanical Properties: Moderate strength for structural integrity.

    • Pressure Tight: Can handle high pressures and temperatures up to 260°C.

6. Worm Gears and Worm Wheels

  • Applications: Worm gears, worm wheels.

  • Reasons:

    • Corrosion Resistance: Protects against environmental factors.

    • Friction & Wear Properties: Low friction and high wear resistance, essential for smooth operation.

    • Machining Properties: Good machinability for precise gear teeth.

    • Mechanical Properties: Moderate strength to handle operational stresses.

Summary

CUSN12 tin bronze is chosen for these applications due to its:

  • Corrosion Resistance: Suitable for harsh environments.

  • Friction & Wear Properties: Low friction and high wear resistance, ideal for moving parts.

  • Mechanical Properties: Moderate strength ensures durability.

  • Machining Properties: Good machinability for precise component manufacturing.

  • Pressure Tight: Can withstand high pressures and temperatures, making it versatile for various industrial uses.

These properties make CUSN12 tin bronze a reliable material for components that require a balance of strength, wear resistance, and corrosion resistance.