Tin Bronze Alloy Grades For Bearings

Tin Bronze Alloy Grades For Bearings

self-lubricating bushing bronze castings

Tin Bronze Alloy Grades: A Technical Guide to C90250, CuSn10, 906D, CT1 for Self-Lubricating Bearings

Selecting the right tin bronze alloy grade is a critical decision for engineers and procurement managers. For demanding applications in marine, chemical, and industrial sectors, self-lubricating bearings must possess a specific combination of properties: high corrosion resistance, excellent wear resistance, and non-sparking safety. The C90250, 906D, CT1, and CuSn10 bronze bushing grades stand out as top choices.

This guide provides a detailed analysis of these key tin bronze alloy grades, covering their unique compositions, technical parameters, and specific applications. Our goal is to help you confidently select the ideal material for your next project, ensuring long-lasting performance and reliability.

Core Advantages of Tin Bronze Self-Lubricating Bearings

Tin bronze materials are a preferred choice for self-lubricating bearings due to their exceptional properties:

  • Excellent Corrosion Resistance: These alloys are highly resistant to corrosion, especially in saltwater environments. This makes them indispensable for marine and offshore applications.
  • Good Wear Resistance: A high tin content contributes to superior hardness and durability, allowing the bearings to withstand high loads and low-speed conditions without premature wear.
  • Non-Sparking: Tin bronze is a non-sparking material, which is a crucial safety feature for use in hazardous environments where combustible gases or dust are present, such as in mining or petrochemical facilities.
  • Self-Lubricating Capability: The inherent properties of these alloys make them suitable for applications with limited or intermittent lubrication, providing reliable performance when other materials would fail.

Below is a detailed breakdown of each of these important tin bronze alloy grade materials.

In-Depth Analysis of Tin Bronze Grades

We have prepared a comprehensive analysis of four key tin bronze alloy grades, highlighting their unique characteristics and ideal use cases.

C90250 is a standard ASTM grade known for its balanced properties, making it a versatile and reliable choice for a range of applications.

Composition (Wt.%) C90250 Technical Parameters C90250
Copper (Cu) 88.5% – 90.5% Hardness (HB) 90 – 140
Tin (Sn) 9.0% – 10.0% Tensile Strength (MPa) 300 – 400
Zinc (Zn) ≤ 1.0% Yield Strength (MPa) 200 – 300
Lead (Pb) ≤ 0.05% Elongation (%) 10% – 20%
Phosphorus (P) ≤ 0.05% Max Temp (°C) 250
  • Properties: Its high tin content provides excellent corrosion and wear resistance. This grade is also non-sparking and is a prime choice for hazardous environments.
  • Bearing Types: Straight Bushings, Flanged Bushings, Washers, Thrust Washers.
  • Specific Applications:
    • Marine Propulsion: Bearings for propeller shafts, rudder bearings, and stern tube bearings.
    • Chemical & Petrochemical Industries: Bearings for pumps, valves, and compressors.
    • Water Treatment: Bearings in pumps and filtration systems.

The 906D grade is specifically valued for its exceptional strength and wear resistance, making it an excellent choice for heavy-duty applications where reliability under pressure is paramount.

Composition (Wt.%) 906D Technical Parameters 906D
Copper (Cu) 87% – 89% Hardness (HB) 80 – 120
Tin (Sn) 10% – 11% Tensile Strength (MPa) 250 – 350
Zinc (Zn) ≤ 1.0% Yield Strength (MPa) 150 – 250
Lead (Pb) ≤ 0.05% Elongation (%) 10% – 20%
Phosphorus (P) ≤ 0.05% Max Temp (°C) 250
  • Properties: The high tin content enhances both wear resistance and strength, making it perfect for applications with high loads. Its corrosion resistance is ideal for saltwater and harsh industrial settings.
  • Bearing Types: Straight Bushings, Flanged Bushings, Washers, Thrust Washers.
  • Specific Applications:
    • Marine Engines: Bearings for shaft supports, rudder bearings, and stern tube bearings.
    • Industrial Pumps: Used in sewage pumps, chemical pumps, and marine pumps.
    • Heavy-Duty Machinery: Bearings for gears, conveyors, and valves.

CT1 is a Chinese national standard tin bronze alloy grade that provides a versatile, reliable option for a broad range of industrial and marine applications.

Composition (Wt.%) CT1 Technical Parameters CT1
Copper (Cu) 88.5% – 90.5% Hardness (HB) 80 – 130
Tin (Sn) 9.5% – 10.5% Tensile Strength (MPa) 250 – 380
Zinc (Zn) ≤ 1.0% Yield Strength (MPa) 150 – 250
Lead (Pb) ≤ 0.05% Elongation (%) 8% – 12%
Phosphorus (P) ≤ 0.05% Max Temp (°C) 250
  • Properties: The high tin content offers excellent corrosion and abrasion resistance. Its non-sparking nature makes it ideal for hazardous environments. It also provides good lubrication for low-speed, high-load conditions.
  • Bearing Types: Straight Bushings, Flanged Bushings, Washers, Thrust Washers.
  • Specific Applications:
    • Marine & Offshore Equipment: Bearings for propeller shafts, rudder bearings, and pumps.
    • Sewage Treatment: Bearings in filtration systems and pumps.
    • Oil & Gas Industry: Bearings in valves, pumps, and compressors on offshore rigs.

CuSn10 is a well-established European standard tin bronze alloy grade known for its high mechanical strength and exceptional wear resistance.

Composition (Wt.%) CuSn10 Technical Parameters CuSn10
Copper (Cu) 90% – 92% Hardness (HB) 90 – 140
Tin (Sn) 8% – 10% Tensile Strength (MPa) 300 – 400
Zinc (Zn) ≤ 1.0% Yield Strength (MPa) 200 – 350
Lead (Pb) ≤ 0.05% Elongation (%) 10% – 15%
Phosphorus (P) ≤ 0.05% Max Temp (°C) 250
  • Properties: The high tin content ensures excellent strength and corrosion resistance. Its non-sparking properties make it suitable for a range of hazardous industrial applications.
  • Bearing Types: Straight Bushings, Flanged Bushings, Washers, Thrust Washers.
  • Specific Applications:
    • Marine Applications: Bearings for ship propulsion systems, rudder bearings, and underwater equipment.
    • Sewage Pumps: Bearings used in sewage treatment and water treatment plants.
    • Chemical Industry: Bearings in pumps, valves, and compressors.

How to Choose the Right Tin Bronze Alloy Grade

When selecting the best tin bronze alloy grade for your application, consider these factors:

  • For High Corrosion Resistance: C90250 and CuSn10 are excellent choices, especially in saltwater or chemical environments.
  • For High Strength and Load: If your application involves heavy loads or high pressure, 906D and CuSn10 offer superior strength and durability.
  • For General-Purpose Reliability: CT1 provides a balanced mix of performance characteristics, making it a versatile choice for a wide range of needs.

At Bearingface.com, we specialize in manufacturing customized tin bronze self-lubricating bearings from these and other specialized materials. Our expertise ensures you get a component that perfectly matches your performance requirements.

Ready to Find Your Ideal Tin Bronze Alloy Grade?

Don’t compromise on the quality and performance of your self-lubricating bearings. The right tin bronze alloy grade can significantly extend the lifespan of your equipment and reduce maintenance costs.

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Request a Quote: Submit your design specifications or application requirements to receive a customized quote for your tin bronze self-lubricating bearings.

Contact Our Experts: Our team is ready to assist you with material selection and technical guidance to find the best solution for your needs.

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