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The Ultimate Guide to Centrifugal Solid Bronze Bearing CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze Cast Bronze Bushing

In the world of machinery and engineering, bearings play a critical role in ensuring the smooth operation of various mechanical components. Among the many types of bearings available, the Centrifugal Solid Bronze Bearing CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze Cast Bronze Bushing stands out for its durability, reliability, and versatility. This guide delves into the features, benefits, and applications of this exceptional bearing material.

Material CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze

Material Chemical Composition
% Cu% Pb% Sn% Zn% Ni% Fe% P% Sb%
Min. 81.00 5.00 6.00 2.00 0.00 0.00 0.00 0.00
Max. 85.00 8.00 8.00 5.00 2.00 0.20 0.10 0.30

Availability

We offer a variety of high-quality bronze bearing products, including:

  1. Cylindrical Cast Bronze Bushings
  2. Flanged Solid Bronze Bushings
  3. Bronze Thrust Washers

Additionally, we can create custom-designed solid bronze bearings to meet your specific requirements.

CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze Technical Data

Material CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze
Density 8.9
HB Hardness ≥70
Tensile Strength MPa ≥260
Yield Strength MPa ≥120
Elongation % ≥12
Thermal Expansion Coefficient 1.8×10*%/°C
Max. Operation Temp. -40~+400°C
Max. load MPa 60
CAST BRONZE1
bronze lube bushings
What is a Centrifugal Solid Bronze Bearing?

 

A centrifugal solid bronze bearing is manufactured using the centrifugal casting process, where molten bronze is poured into a rotating mold. This process ensures that the material is dense, free from impurities, and has a uniform grain structure. The result is a high-quality bearing that can withstand heavy loads and harsh operating conditions.

CAST BRONZE2
centrifugal cast bronze self-lubricating bushing bearings
Composition of CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze
  • The CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze alloy is a specific type of bronze that consists of:
  • Copper (Cu): The primary component, providing excellent thermal and electrical conductivity.
  • Tin (Sn): Adds strength and corrosion resistance.
  • Zinc (Zn): Improves the alloy’s hardness and wear resistance.
  • Lead (Pb): Enhances machinability and provides lubrication properties.

This combination of elements makes CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze bronze an ideal material for bearings, offering a balance of strength, wear resistance, and self-lubricating properties.

CAST BRONZE3
centrifugal cast bronze self-lubricating bearings
Maintenance and Lubrication
Despite its self-lubricating nature, regular maintenance of bearing brass components is essential to extend their lifespan and ensure optimal performance. Routine checks for wear and tear, along with periodic cleaning, are recommended. For applications involving extremely high loads or temperatures, supplementary lubrication may be necessary to aid the inherent properties of the brass and prevent premature failure.

Type Of Bearing

Bearing brass

Bearing brass stands out in the world of special alloys due to its robustness, self-lubricating properties, and ease of machining. These characteristics make it a preferred choice for components that require high durability and minimal maintenance. Whether it’s in automotive, aerospace, or industrial machinery, bearing brass continues to play a critical role in enhancing the performance and reliability of various mechanical systems. Regular maintenance, coupled with an understanding of how to effectively machine this alloy, ensures that bearing brass components can deliver their best performance over their operational lifetime.

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Explore a wide variety of industrial and scientific products including Sleeve Bearings, Quick Disconnect Bushings, and Flanged Sleeve Bearings.
EN 1982 Bronze, Solid Brass Bushing Oil Lubricated
Sleeve Bearing, Cast Brass Bushings, Cast Brass Self-Lubricating Bushing
BEARING BRASS

Key Features and Benefits

1. High Load Capacity

The solid bronze structure and the specific alloy composition give these bearings a high load-carrying capacity, making them suitable for heavy-duty applications.

2. Excellent Wear Resistance

CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze is known for its exceptional wear resistance, which translates to longer service life and reduced maintenance costs.

3. Self-Lubricating Properties

The presence of lead in the alloy provides natural lubricating properties, reducing friction and wear between the bearing and the shaft.

4. Corrosion Resistance

Bronze is inherently resistant to corrosion, which is crucial for bearings operating in harsh environments or exposed to moisture and chemicals.

5. Dimensional Stability

The centrifugal casting process ensures that the bearings have high dimensional accuracy and stability, which is essential for precision applications.

Applications of CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze Cast Bronze Bushings, Centrifugal solid bronze bearings made from CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze are used in a wide range of applications, including:

1. Industrial Machinery

These bearings are ideal for use in heavy machinery, such as presses, mills, and construction equipment, where high load capacity and durability are required.

2. Automotive Industry

In the automotive sector, these bearings are used in engines, transmissions, and other critical components, providing reliable performance under varying conditions.

3. Marine Applications

The corrosion resistance of bronze makes these bearings suitable for marine environments, where they are used in ship propellers, rudders, and other underwater components.

4. Agricultural Equipment

Farm machinery often operates in harsh conditions, and these bronze bearings ensure reliable performance and longevity in such demanding environments.

BEARING BRASS
graphite embedded brass bushing: CuAl10Ni (CW307G)

CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze Maintenance and Care

 

To maximize the lifespan and performance of centrifugal solid bronze bearings, it is essential to follow proper maintenance practices:

Regular Inspection: Periodically check the bearings for signs of wear, corrosion, or damage.

Lubrication: Although these bearings have self-lubricating properties, additional lubrication may be required in some applications to enhance performance.

Cleanliness: Keep the bearing and surrounding areas clean to prevent contamination and ensure smooth operation.

Centrifugal Solid Bronze Bearing material and Design

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Centrifugal Solid Bronze Bearings Made From CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze Cast Bronze

Centrifugal solid bronze bearings made from CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze cast bronze bushing offer a superior combination of strength, durability, and self-lubricating properties. Their versatility makes them an ideal choice for a wide range of industrial, automotive, marine, aerospace, and agricultural applications. By understanding their features and benefits, and following proper maintenance practices, you can ensure these bearings provide reliable performance and longevity in your machinery.

Whether you’re an engineer, a maintenance professional, or an equipment manufacturer, incorporating CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze cast bronze bushings into your designs can significantly enhance the efficiency and lifespan of your mechanical systems.

ASTM bearing Brass parts, CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze

Bronzes that comply with the ASTM B505 and B271 standard
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EN 1982 Bearing Brass Plate, CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze

Range of brass bearing from the European Standard EN 1982.
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Maintenance Free, Bearing Bronze Components

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Composition and Properties of Tin Bronzes

Tin Content: Tin is the key component in tin bronzes, typically comprising 8-12.5% of the alloy. Its presence notably enhances the strength and hardness of the alloy compared to pure copper.

Copper Base: Copper constitutes approximately 87% of the alloy, providing excellent conductivity and corrosion resistance, which are advantageous for numerous applications.

Additional Elements:

  • Lead: Integrated to enhance anti-friction properties, making the alloy particularly suitable for bearings and other applications where friction reduction is crucial.
  • Zinc: Increases the strength and wear resistance of the alloy.
  • Phosphorus: Boosts machinability and can also strengthen the alloy.

Applications of Tin Bronzes in Bearings

Tin bronzes are highly valued in bearing applications due to their robust combination of strength, wear resistance, and favorable frictional properties. Specific applications include:

  • Plain Bearings: Often utilized in devices that mitigate friction between moving parts.
  • Bushing and Sleeve Bearings: Employed where a smooth surface is necessary to minimize friction and wear.
  • Gear Components: The strength and durability of tin bronzes are ideal for gears subjected to heavy loads, ensuring reliable operation over extended periods.
  • Pump Bodies and Structural Parts: Useful in components exposed to high loads and corrosive environments.

Standards and Specifications

Tin bronzes are manufactured in accordance with various international standards, such as the EN 1982 standard. Examples of tin bronze alloys conforming to this standard include:

  • CuSn5Zn5Pb5 (CC491K): Known for its high durability and tensile strength, this alloy is ideal for heavily loaded machine parts and high-speed machine friction components.
  • EN 1982 CC491K, CuSn5ZnPb5-C: Also referred to as red metal, this alloy is favored for applications requiring excellent bearing properties and wear resistance.
  • CuAl10Fe5Ni5 (CC333G): Although not a traditional tin bronze, this alloy is recognized under the EN 1982 standard and is suitable for parts operating under extreme load and tension, thanks to its superior corrosion resistance.

In conclusion, tin bronzes offer a versatile range of properties making them excellent for bearing applications. Their well-defined composition and compliance with international standards like EN 1982 enable them to meet the diverse demands of various industrial uses where high strength, wear resistance, and effective friction management are essential.

Composition of Leaded Bronzes

Leaded bronzes are primarily composed of copper, tin, and lead. Typically, the lead content ranges from 4 to 10%, enhancing the alloy’s lubricity under dry or boundary lubrication conditions. Tin, which usually constitutes 8 to 12% of the alloy, bolsters the strength and hardness of the bronze.

Properties of Leaded Bronzes

  • Self-Lubrication: Lead imparts a smooth, low-friction surface to the alloy, enabling operation with minimal external lubrication.
  • Improved Wear Resistance: These bronzes are noted for their robust wear resistance, essential for the durability of bearings and other mechanical components.
  • High Strength and Fatigue Resistance: The synergy of copper and tin endows the alloy with considerable strength and fatigue resistance, suitable for enduring heavy loads and repetitive stress cycles.
  • Corrosion Resistance: Leaded bronzes also demonstrate commendable resistance to corrosion, making them apt for harsh environmental conditions.

Applications of Leaded Bronze Bearings

  • Heavy Machinery Bearings: The self-lubricating properties of leaded bronzes make them ideal for bearings in heavy machinery such as industrial pumps, compressors, and gears.
  • Automotive and Transportation: These bearings are utilized in various automotive applications, including wheel bearings, valve lifters, and suspension components.
  • Marine and Offshore Equipment: Their corrosion resistance makes leaded bronzes suitable for marine and offshore applications, where they face exposure to saltwater and other corrosive elements.
  • Industrial Machinery: Leaded bronze bearings find extensive use in industrial machinery across sectors such as textiles, printing, and food processing, where consistent performance is crucial.

Environmental Considerations and Alternatives

The environmental and health impacts of lead have led to scrutiny over its use in bronze alloys. With lead recognized as a toxic substance, efforts are increasing to phase it out or restrict its use. This has spurred interest in developing alternatives such as bismuth bronze, which offers similar self-lubricating properties without lead. Additionally, alloys based on aluminum and zinc are being explored as potential substitutes for leaded bronzes.

Composition and Properties of CuSn7Zn4Pb7

Composition:

  • Copper (Cu): As the foundational metal, copper comprises the majority of CuSn7Zn4Pb7, offering excellent conductivity and corrosion resistance which underpins the alloy’s performance.
  • Tin (Sn): Tin, making up about 7% of the alloy, enhances its strength and hardness, which are critical for the alloy’s durability and resistance to wear.
  • Zinc (Zn): The inclusion of zinc not only improves the alloy’s casting characteristics but also augments its strength.
  • Lead (Pb): At approximately 4%, lead boosts the alloy’s machinability and imparts superior bearing qualities, such as self-lubrication under certain operational conditions.

Performance Characteristics:

  • High Strength and Hardness: The synergy of copper, tin, and lead provides substantial strength and hardness, crucial for enduring heavy loads in bearing applications.
  • Wear Resistance: CuSn7Zn4Pb7 is noted for its exceptional wear resistance, ideal for plain bearings subjected to consistent friction and movement.
  • Self-Lubricating Properties: Lead content facilitates self-lubrication, reducing reliance on external lubricants and enhancing performance in dry or boundary lubrication scenarios.
  • Corrosion Resistance: This alloy boasts significant resistance to various forms of corrosion, making it suitable for harsh environments.

Applications in Heavy-Duty Environments:

  • Industrial Machinery: Due to its robustness and wear resistance, the alloy excels in heavy machinery such as pumps, compressors, and gears, ensuring dependable operation.
  • Automotive Industry: Utilized in components like wheel bearings and transmission parts, CuSn7Zn4Pb7 supports high durability and load-bearing demands.
  • Marine and Offshore Equipment: Its corrosion resistance proves invaluable in marine settings, safeguarding equipment against the rigors of saltwater and extreme conditions.
  • Renewable Energy: The alloy’s properties make it apt for renewable energy technologies, such as wind turbines and solar panels, where long-term reliability is essential.

Conclusion: CuSn7Zn4Pb7, a leaded tin bronze, is excellently suited for plain bearings in demanding applications. Its blend of strength, wear resistance, self-lubrication, and corrosion resistance renders it an optimal material for environments where high performance and longevity are critical.

While leaded bronzes are effective bearing materials known for their self-lubrication, wear resistance, and strength, the industry is actively pursuing alternative materials. These alternatives aim to replicate the performance benefits of leaded bronzes without the environmental and health risks associated with lead.

Composition of Aluminum Bronzes

Aluminum bronzes are distinguished by their high aluminum content, which typically ranges from 6% to 12%. The base of the alloy is predominantly copper, which enhances the overall properties of the alloy. To improve performance, small quantities of other elements such as iron, nickel, or manganese may be included.

Properties of Aluminum Bronzes

  • High Strength and Hardness: Aluminum bronzes are noted for their robust strength and hardness, making them ideal for bearing materials that need to endure heavy loads and abrasive conditions.
  • Corrosion Resistance: These alloys excel in corrosion resistance, particularly in marine environments where they are exposed to saltwater and other corrosive agents.
  • Wear Resistance: The inherent hardness and composition of aluminum bronzes enhance their wear resistance, essential for bearings and components subjected to friction.
  • Machinability: Aluminum bronzes are often highly machinable, facilitating the fabrication of complex parts with precision.
  • Thermal Conductivity: These alloys also possess good thermal conductivity, advantageous in applications requiring effective heat dissipation.

Applications of Aluminum Bronze Bearings

  • Marine Equipment: Their corrosion resistance makes aluminum bronze bearings suitable for marine use, such as in propellers, shafts, and other subsea components.
  • Industrial Machinery: Given their strength and wear resistance, these bronzes are preferred in industrial machinery for gears, bushings, and bearings under heavy loads.
  • Aerospace Components: Aluminum bronzes are valued in aerospace for components like bushings and bearings, where high strength and fatigue resistance are crucial.
  • Automotive Industry: These bearings are employed in various automotive applications, including wheel bearings, benefiting from their self-lubricating properties and resistance to wear.
  • Electronics and Electrical Equipment: The thermal conductivity of aluminum bronzes is beneficial in the electronics and electrical sectors, aiding in heat dissipation for optimal functioning.

Popular Aluminum Bronze Alloys

  • C954 Aluminum Bronze: Known for its excellent tensile and yield strength, ductility, weldability, and machinability, C954 is widely used where strength and corrosion resistance are required.
  • C95500 Aluminum Bronze: This alloy offers properties similar to C954 but with a slightly higher aluminum content, enhancing its corrosion resistance and strength.
  • C95200 Aluminum Bronze: Renowned for its superior bearing properties, C95200 is frequently chosen for applications demanding high load capacity and wear resistance.

In summary, aluminum bronzes are a versatile class of bearing bronzes that excel in strength, corrosion resistance, and wear resistance, making them suitable for a broad spectrum of applications, from marine and industrial machinery to aerospace and automotive industries. The reliability and performance of these alloys in demanding conditions contribute to their widespread popularity.

High Tensile Brasses: Composition and Applications

Overview High Tensile Brasses, also known as Manganese Bronze or High Strength Brass, are specialized copper alloys designed for enhanced mechanical properties, especially tensile strength. These alloys are vital in applications requiring high strength and durability, such as in the manufacturing of bearing components.

Composition The primary components of High Tensile Brasses are copper and zinc. Manganese is the critical alloying element that sets these brasses apart from standard brass alloys, as it significantly boosts the alloy’s strength. Additional elements like aluminum, iron, nickel, and silicon may be incorporated to further improve various characteristics of the alloy.

Properties

  • High Tensile Strength: The inclusion of manganese and other elements markedly increases these brasses’ tensile strength beyond that of standard brass alloys.
  • Good Fatigue Resistance: These alloys exhibit enhanced fatigue resistance, making them suitable for applications involving cyclic loading.
  • Corrosion Resistance: High Tensile Brasses offer robust corrosion resistance, particularly in marine and other corrosive environments.
  • Wear Resistance: The inherent strength and hardness also enhance their wear resistance, crucial in bearing applications.
  • Machinability: Despite their hardness, High Tensile Brasses are machinable, allowing for the precise fabrication of complex parts.

Applications

  • Bearings and Bushings: Ideal for bearings and bushings, these alloys can handle heavy loads and demanding operational conditions due to their strength and wear resistance.
  • Marine Components: Their corrosion resistance makes them suitable for marine applications, including propeller shafts and bearings exposed to saltwater.
  • Heavy Machinery: Utilized in construction equipment, agricultural machinery, and industrial pumps, where components face high loads and stress.
  • Automotive Industry: Found in various automotive components such as valve stems, wear rings, and bearings designed for heavy loads.
  • Structural Components: Employed in structural components that demand high strength and fatigue resistance, such as bridges and infrastructure projects.

Popular High Tensile Brass Alloys

  • CZ114/CW721R: Known for its versatility, this high-strength brass alloy is both hot workable and machinable, often used for its excellent mechanical properties.
  • C95200: A specific high-tensile brass that balances strength, corrosion resistance, and machinability.
  • ToughMet Spinodal: A high-entropy alloy that includes high tensile brasses and bronzes, providing unique property combinations for specialized applications.

Summary High Tensile Brasses are essential copper alloys that deliver superior mechanical properties, particularly in tensile strength. Their robustness, combined with excellent corrosion and wear resistance, makes them highly sought after for a wide array of industrial and engineering applications.

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