Bearing Bronze C86700 Alloys: Characteristics and Selection Guide, Centrifugal Cast Alloy (UNS C87600) – Mechanical Properties

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Understanding C86700 Bronze Bearings: The Ultimate Guide

Bronze bearings are essential components in various machinery, offering durability and reliability. One such versatile bronze alloy is C86700, known for its unique properties and applications. This blog post explores C86700 bronze bearings, focusing on their specifications, applications, and benefits.

Chemical Composition

The chemical composition of UNS C86700 alloy is outlined in the following table:

Element Content (%)
Cu 58
Zn 41
Pb 1

 

CAST BRONZE1
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What is C86700 Bronze?
C86700 is a leaded high-strength yellow brass, also known as manganese bronze. It is recognized for its excellent mechanical properties, including high tensile strength, good corrosion resistance, and superior wear resistance. These characteristics make it a popular choice for demanding applications in different industries.
CAST BRONZE2
centrifugal cast bronze self-lubricating bushing bearings
Key Features of C86700 Bronze Bearings
  • High Strength: C86700 bronze has excellent tensile strength, making it suitable for heavy-duty applications.
  • Self-Lubricating: The material’s self-lubricating properties reduce maintenance needs and extend the bearing’s lifespan.
  • Corrosion Resistance: It offers good resistance to corrosion, ensuring longevity in harsh environments.
  • Wear Resistance: The alloy is highly resistant to wear and tear, maintaining its performance over time.
  • Machinability: C86700 bronze can be easily machined, allowing for the production of intricate components.
CAST BRONZE3
centrifugal cast bronze self-lubricating bearings
Applications of C86700 Bronze Bearings
1. Backhoe Front Axle Suspension

 

C86700 bronze bearings are commonly used in backhoe front axle suspensions. Their high strength and durability ensure smooth operation and support the heavy loads and stresses associated with construction machinery.

 

2. Cylinder End Boom Bearings

 

In mini diggers and other construction equipment, C86700 bronze bearings are utilized in the cylinder end boom. These bearings are crucial for the smooth movement of the boom, enhancing the machine’s efficiency and performance.

 

3. Solid Bronze Bushings

 

C86700 and C86800 bronze bushings are integral components in various mechanical systems. These solid bronze bushings provide reliable support and reduce friction between moving parts, ensuring efficient operation.

Type Of Bearing

Bearing brass, 86700 Bronze Bearings

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.

ASTM Bearing Brass
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

Advantages of Using C86700 Bronze Bearings

 

Extended Lifespan: The high wear resistance and self-lubricating properties of C86700 bronze bearings result in a longer operational life, reducing the need for frequent replacements.

Reduced Maintenance: With self-lubricating capabilities, these bearings require less maintenance, saving time and costs in the long run.

Versatility: C86700 bronze bearings are versatile and can be used in a wide range of applications, from heavy machinery to industrial equipment.

Improved Performance: The superior strength and corrosion resistance of C86700 bronze bearings ensure consistent and reliable performance, even in challenging conditions.

C86700 bronze bearings

C86700 bronze bearings are a reliable and efficient choice for various industrial applications. Their high strength, self-lubricating properties, and resistance to wear and corrosion make them indispensable in heavy-duty machinery and equipment. Whether for backhoe front axle suspensions, cylinder end booms, or solid bronze bushings, C86700 bronze bearings deliver exceptional performance and durability.

If you’re looking for high-quality bronze bearings for your machinery, consider C86700 bronze bearings for their proven reliability and efficiency.

BEARING BRASS
graphite embedded brass bushing: CuAl10Ni (CW307G)

Other Designations: Equivalent designations to UNS C86700 alloy include:

  • ASTM B271
  • ASTM B30
  • ASTM B584
  • ASTM B763

Leaded high-strength yellow brass UNS C86700 is a cast alloy composed of manganese bronze and leaded manganese bronze. The lead content imparts an attractive golden color, while the manganese gives the alloy a chocolate brown hue. This unique combination makes UNS C86700 alloy highly favored in architectural applications for its appealing color and long-lasting durability.

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C86700 Bronze Bearing with Groove: A Comprehensive Overview

A grooved bearing features a series of grooves or channels on its inner surface. These grooves serve to retain and distribute lubricant more efficiently, ensuring smoother operation and reducing friction. This design is particularly beneficial in applications where consistent lubrication is crucial for performance and longevity.

C86700 bronze bearings with grooves are an excellent choice for applications requiring reliable and efficient performance. Their high strength, wear resistance, and enhanced lubrication capabilities make them indispensable in various industries, from construction and industrial equipment to automotive applications. Choosing C86700 grooved bronze bearings ensures longevity, reduced maintenance, and improved machinery performance.

ASTM bearing Brass groove Bushing

Bronzes that comply with the ASTM B505 and B271 standard
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EN 1982 Bearing Groove Bearing

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

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Special Bronze Alloys， Manufacture of Bronze Parts

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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Custom CuSn7Zn4Pb7 (Rg7)Leaded Tin Bronze, ideal for heavy loads and shock-loading conditions, are designed for easy installation.