Understanding the Versatility and Applications of Gunmetal Bushes: Leaded Tin Bronze Alloys
Maintenance-free Plain Bearings
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graphite impregnated Gunmetal Bushes – Sleeve & Flange More
Gunmetal, also known widely as Leaded Tin Bronze, is a cornerstone material in various engineering and industrial applications due to its robust mechanical properties and versatility. Standardized under IS-318 and aligning with the specifications of BS-1400, gunmetal bushes play an integral role in the functionality and longevity of machinery across multiple sectors. Continuously cast bronze bushing common bronze alloy is CuSn7Zn4Pb7 (CC493K), also known as Rg7 or gunmetal.
PTFE plugged leaded tin bronze bushes are a testament to the innovations in material engineering, combining the strength and durability of bronze with the self-lubricating properties of PTFE. This makes them an ideal choice for a wide range of applications where efficiency, longevity, and reliability are critical. As industries continue to push the boundaries of technology and performance, these advanced bushes stand out as a smart choice for reducing operational costs and enhancing equipment life.
Material Overview and Grades, Highlight on Continuously Cast Bronze Bushing: CuSn7Zn4Pb7 (CC493K)
A prominent material in our continuously cast bronze bushing line is the CuSn7Zn4Pb7, designated as CC493K, and commonly referred to as Rg7 or gunmetal. This bronze alloy is favored for its reliability in various applications, especially in scenarios demanding durability and corrosion resistance. Its well-balanced composition makes it a standard choice for manufacturing robust bushings used in mechanical systems where friction and wear are concerns.
Leaded Tin Bronze, or LTB, is crafted to cater to a diverse range of mechanical and structural needs. It features a composition that typically includes copper, tin, and lead, which collectively confer strength, machinability, and resistance to wear and corrosion—traits ideal for components subjected to high mechanical stress.
Material Grades, Gunmetal (Copper-Tin-Zinc cast alloys) Precision Brass Bearing Bushing
Engineered for precision, this brass bearing bushing is designed to minimize friction and ensure smooth motion in demanding mechanical systems, offering a perfect balance of strength and ease of maintenance.
The categorization into grades such as LTB1, LTB2, LTB3, LTB4, LTB5, and LTB6 allows engineers and designers to select materials based on specific operational requirements:
LTB1 & LTB2: These grades are known for their fair strength and excellent machinability, making them suitable for general castings used in bushes, valve fittings, and pump parts.
LTB3 & LTB4: Optimized for applications requiring high-speed and heavy or moderate bearing capacities, these grades are typically used in submersible pump bushes-bearings.
LTB5: This grade is ideal for scenarios involving hard or moderately hard shafts under moderate to low loads and speeds, where lubrication and alignment might be less than perfect.
LTB6: Best suited for bearings operating under light loads and high speeds, LTB6 provides essential functionality in less demanding contexts.
graphite impregnated bronze Bushing, gunmetal Bush Applications in Industry
The properties of Leaded Tin Bronze make it a preferred choice for producing bushes used in a myriad of applications:
Engines and Pumps: The alloy’s ability to withstand friction and environmental corrosion makes it ideal for engine components and pump systems, ensuring longevity and reliability.
Valves and Impellers: In valve and impeller applications, the wear resistance and structural integrity of gunmetal bushes safeguard against functional failures, enhancing performance.
Engineering Industries: Both light and heavy engineering industries benefit from the diverse grades of LTB, which can be tailored to meet the specific stress profiles and operational demands of various machinery.
High-Performance Bronze Bushing: Designed for tough applications, this bronze bearing bushing delivers exceptional performance in both high-speed and high-load conditions. Its self-lubricating properties reduce wear and ensure smooth operation even under the most demanding conditions.
Advantages of Gunmetal Bushes, Request a Project Consultation Today!
Self-Lubricating Properties: Some grades of the Leaded Tin Bronze alloy are designed to be self-lubricating. This reduces the need for regular maintenance, decreasing downtime and operational costs.
Durability: The robust nature of gunmetal ensures that components like bushes maintain their integrity over long periods, even under adverse conditions.
Machinability: Gunmetal grades are generally easy to machine, which facilitates the manufacturing of components with precise specifications and reduces production times.
Custom Solutions, Gunmetal Brass bushes
Gunmetal bushes, made from various grades of leaded tin bronze, are essential for improving machinery efficiency and durability across many sectors. Their specific properties meet diverse industrial needs, making them vital components in engines, pumps, valves, and a wide range of engineering applications. As industries evolve, the reliance on versatile and reliable materials like gunmetal will continue, driving innovation and advancements in industrial operations worldwide.
This Gunmetal bush is expertly manufactured using high-quality raw materials and advanced technology, ensuring adherence to strict quality standards. Each bush undergoes rigorous quality testing to guarantee its performance and reliability. Additionally, we offer this bush in a variety of sizes and specifications, all at competitive market prices.
We also supply Plain Bearings to DIN 1850.
Gunmetal (Copper-Tin-Zinc Cast Alloys): CuSn7Zn3Ni2PS-C Overview
Alloy Information
- EN Number: DIN EN 1982 , CC471K
- Density: Approximately 8.8 g/cm³
- Composition: Copper (Cu) 85.0 – 92.3%, Tin (Sn) 5.4 – 8.0%, Zinc (Zn) 1.0 – 3.5%, Nickel (Ni) 1.1 – 2.5%, Phosphorus (P) 0.03 – 0.06%, Sulfur (S) 0.2 – 0.6%, Lead (Pb) < 0.09%
Properties and Applications The material serves as a lead-free alternative to the traditional RG7 (CC493K) alloy, offering a safe option for the same range of applications. This alloy provides medium hardness, good emergency running properties, and sufficient wear resistance, making it suitable for use with unhardened shafts and light edge pressures. It is easy to machine, producing short shavings, and exhibits good corrosion resistance, including in seawater environments. The alloy is both soft and conditionally hard solderable. Primary applications include plain bearings and bushes within general mechanical engineering contexts.
Alloy Specifications for CuSn5Zn5Pb5-C
Alloy Information
- EN Number: DIN EN 1982 (Rg5), CC491K
- Density: Approximately 8.7 g/cm³
- Composition: Copper (Cu) 83.0 – 87.0%, Tin (Sn) 4.0 – 6.0%, Zinc (Zn) 4.0 – 6.0%, Lead (Pb) 4.0 – 6.0%
Properties and Applications CuSn5Zn5Pb5-C is a versatile construction material primarily used for water and steam fitting housings capable of withstanding temperatures up to 255 °C. This alloy is also employed in the production of pump housings and intricate, thin-walled castings and machined parts for mechanical engineering, apparatus engineering, and shipbuilding. It has largely been superseded by CuSn7Zn4Pb7-C as a bearing material in many applications.
Oilless Bearings Benefits:
High Load Capacity: The high-strength bronze can support substantial loads without deforming.
Low Maintenance: The self-lubricating properties reduce the need for regular maintenance and re-lubrication.
Long Service Life: The combination of material strength and self-lubrication contributes to a longer service life.
Resilience to Wear: The hardness achieved through heat treatment helps resist wear, even under continuous operation.
Versatility: These bearings can be used in a variety of applications, including industrial machinery, automotive suspension systems, and heavy equipment, where they can operate reliably in challenging conditions.
| Material Type | Code | China GB1176-87 | International ISO 1338 | Germany DIN | Japan JIS | USA ASTM(UNS) | UK BS | France NF | Applicable Situation |
|---|---|---|---|---|---|---|---|---|---|
| High Strength Alloy Copper | JDB650 | ZCuZn25Al6Fe3Mn3 | GCuZn25Al6Fe3Mn3 | DIN1709 | G-CuZn25Al5 | H5102 | CAC304 | B30-92 | C86300 |
| Super High Strength
Alloy Copper |
JDB650 S1 | ZCuZn25Al6Fe3Mn3 | GCuZn25Al6Fe3Mn3 | DIN1709 | G-CuZn25Al5 | H5102 | CAC304 | B30-92 | C86300 |
| Cast Tin Bronze | JDB650 S2 | ZCuSn5Pb5Zn5 | GCuPb5Sn5Zn5 | DIN1705 | G-CuSn5ZnPb | H5111 | BC6 | B30-92 | C83600 |
| Cast Aluminum Bronze | JDB650 S3 | ZCuAl9Fe4Ni4Mn2 | GCuAl10FeNi5 | DIN17656 | G-CuAl10Ni | H5114 | AlBC3 | B30-92 | C95500 |
| Cast Iron | JDB(HT250) | GB5675-85 | HT250 | FC250 | ASTM Class40 | – | – | – | – |
Self-Lubricating Features
A notable application of CuZn25Al5Mn4Fe3 is in the manufacturing of self-lubricating bearings. These bearings often incorporate graphite plugs, which serve as solid lubricants. The graphite embedded in the bearing material helps to reduce friction and wear by providing a continuous lubrication effect during operation. This design is particularly beneficial in environments where conventional lubrication methods are impractical or impossible.
Typical Applications
- Bearings and Bushings: Widely used in machinery that requires components capable of handling high loads with limited movement.
- Marine Applications: Due to its corrosion-resistant properties, it is often utilized in marine environments, although care must be taken to avoid exposure to seawater.
- Heavy Machinery: Commonly found in pumps, motors, and other equipment that undergoes substantial wear and tear.
Manufacturing and Design
CuZn25Al5Mn4Fe3 bearings are often produced through processes like centrifugal casting, which ensures a uniform grain structure and enhances mechanical properties. The bearings can be designed with various configurations, including flanged and sleeve types, to meet specific operational requirements.
Advantages of Graphite Plugged Bearings
- Maintenance-Free Operation: The self-lubricating nature of graphite plugs reduces the need for regular maintenance.
- Extended Lifespan: These bearings tend to have a longer operational life due to reduced wear rates.
- Enhanced Performance: The combination of high-strength brass and graphite allows for efficient load-bearing capabilities with minimal friction.
In summary, CuZn25Al5Mn4Fe3 is a versatile material that combines strength, wear resistance, and self-lubricating properties, making it an excellent choice for various industrial applications, particularly in the production of bearings and bushings. Its unique composition and the addition of graphite enhance its functionality in demanding environments.
| Code | JDB650 | JDB650 S1 | JDB650 S2 | JDB650 S3 | JDB650 S4 | JDB (HT250) | JDB (Gcr15) |
|---|---|---|---|---|---|---|---|
| Material Grade | CuZn25Al6Fe3Mn3 | CuZn25Al6Fe3Mn3 | CuAl9Fe4Ni4Mn2 | CuSn5Pb5Zn5 | CuSn12 | HT250 | Gcr15 |
| Density | 8.0 | 8.0 | 8.5 | 8.9 | 9.05 | 7.0 | 7.8 |
| Hardness HB | >210 | >250 | >150 | >70 | >80 | >190 | HRC>58 |
| Tensile Strength N/mm² | >750 | >800 | >800 | >200 | >260 | >250 | >1500 |
| Elongation % | >12 | >8 | >15 | >10 | >8 | >5 | >15 |
| Linear Expansion Coefficient 10⁻⁵/°C | 1.9 | 1.9 | 1.9 | 1.8 | 1.8 | 1.0 | 1.1 |
| Operating Temperature °C | -40~+300 | -40~+150 | -40~+400 | -40~+400 | -40~+400 | -40~+400 | -40~+400 |
| Maximum Dynamic Load N/mm² | 100 | 120 | 150 | 60 | 70 | 90 | 200 |
| Maximum Linear Speed m/min (Dry) | 15 | 15 | 20 | 10 | 10 | 8 | 5 |
| Max. PV Value N/mm²*m/min | 200 | 200 | 60 | 60 | 80 | 40 | 150 |
| Compressive Permanent
Deformation 300N/mm² |
<0.01 | <0.005 | <0.04 | <0.05 | <0.005 | <0.015 | <0.002 |
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PTFE-Plugged Leaded Tin Bronze Bushes: A Durable Industrial Solution
Polytetrafluoroethylene (PTFE) plugged leaded tin bronze bushes represent a significant advancement in bearing technology, offering a unique blend of durability and self-lubricating properties. These bushes are particularly well-suited for applications that demand both the high mechanical strength of bronze and the exceptional low-friction qualities of PTFE.
