CuZn25Al5Mn4Fe3-C

CuZn25Al5Mn4Fe3-C

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CuZn25Al5Mn4Fe3-C

CuZn25Al5Mn4Fe3-C plugged bronze bushings combine the properties of high-strength manganese bronze with the self-lubricating benefits of graphite plugs.

CuZn25Al5Mn4Fe3-C graphite plugged bronze bushings offer a unique combination of high strength, wear resistance, and self-lubricating properties. These characteristics make them ideal for demanding industrial applications where traditional lubrication methods may be impractical or insufficient. The self-lubricating feature provided by the graphite plugs enhances performance, reduces maintenance requirements, and extends the operational life of the bushings in various challenging environments.

Graphite Plugged Feature

The addition of graphite plugs to CuZn25Al5Mn4Fe3-C bushings enhances their performance:

  • Self-lubrication: Graphite plugs release lubricating particles during operation
  • Reduced friction: Minimizes metal-to-metal contact between the bushing and shaft
  • Extended lifespan: Lower wear rates due to consistent lubrication
  • Low maintenance: Eliminates or reduces the need for external lubrication systems
 

High tensile brass, particularly the CuZn25Al5Mn4Fe3-C alloy, is renowned for its robustness, making it ideal for machine elements under severe demands. It aligns closely with the international standard ASTM B505 C86300. This high-strength copper alloy is primarily used for bushings and bearings. Here are the essential details about this material:

Composition and Classification:
CuZn25Al5Mn4Fe3-C, a copper-zinc alloy, is also known as high-strength manganese bronze or high tensile brass. Its composition typically includes:

  • Copper (Cu): 60-67%
  • Zinc (Zn): Remainder
  • Aluminum (Al): 3-7%
  • Manganese (Mn): 2.5-5%
  • Iron (Fe): 1.5-4%
  • Nickel (Ni): Max 3% Small amounts of silicon, phosphorus, lead, antimony, and tin are also present.

Properties and Characteristics:

  • Exceptional strength: High tensile and yield strength.
  • Good wear resistance: Ideal for durable applications.
  • Good ductility: Offers flexibility in use.
  • Reasonable corrosion resistance: Susceptible to dezincification in specific environments.
  • Poor machinability: Rated at 25 on the machinability scale.

Mechanical Properties:

  • Tensile Strength: 680-750 MPa
  • Yield Strength: 450-580 MPa
  • Elongation: 1-8%
  • Hardness: 180-190 HB

Applications:
CuZn25Al5Mn4Fe3-C is suitable for:

Standards and Designations:
This alloy is recognized under several standards:

  • EN 1982: CC762S
  • ASTM: C86300
  • SAE: 430B
  • BS: HTB3 (similar but not identical)
  • DIN: CuZn25Al5 (similar but not identical)

Manufacturing:
CuZn25Al5Mn4Fe3-C can be manufactured using different casting methods such as:

  • Sand casting (GS)
  • Permanent mold casting (GM)
  • Centrifugal casting (GZ)
  • Continuous casting (GC) The composition and casting conditions are meticulously controlled to ensure consistent quality and performance.

CuZn25Al5Mn4Fe3-C (CC762S) EN 1982

1. Requirements

Chemical Composition (%)

Element Al Cu (a) Fe Mn Ni Zn (Remainder) P Pb Sb Si Sn
Min. 3.0 60.0 1.5 2.5
Max. 7.0 67.0 4.0 5.0 3.0 0.03 0.2 0.03 0.1 0.2

a Including nickel.

Mechanical Properties (Minimum Values)

Casting Process & Designation Tensile Strength Rm (MPa) 0.2% Proof Strength Rp0.2 (MPa) Elongation 5D A (%) Hardness HBW (10-1000)
Continuous Casting (GC) 750 480 5 190
Centrifugal Casting (GZ) 750 480 5 190

Note: The mechanical property requirements listed apply to sizes up to and including 300 mm external diameter. For larger continuous castings, property requirements should be agreed between the supplier and purchaser (8.2.2 Note 6 EN 1982).

2. Closest International Standards

Region Standard Alloy Status
Europe BS 1400 HTB3  
Europe DIN 1709 CuZn25Al5  
Europe NFA 53703 CuZn19Al6  
Europe UNE 37103-2 C-2625 (CuZn25Al6Fe3Mn3)  
USA ASTM B505 C86300 (SAE 430B) Active
USA ASTM B271 C86300 (SAE 430B) Active
Australia AS 1565 C86300 Active
Japan JIS H5121 CAC304C Active
Japan JIS H5120 CAC304 Active
ISO ISO 1338 CuZn25Al6Fe3Mn3  

3. Optional Heat Treatments (upon customer request)

4. Technical Characteristics

  • Challenging machining properties.
  • Good wear resistance.
  • Recommended for high loads, low speeds, good lubrication, and hard contact surfaces.
  • Resistant to seawater and spring water.
  • Resistant to atmospheric corrosion up to 300°C.
  • Low weldability.
 

In summary, CuZn25Al5Mn4Fe3-C is a high-strength, versatile copper alloy, well-suited for demanding industrial applications that require strength, wear resistance, and durability. Its unique properties make it an excellent choice for manufacturing heavy-duty bearings and other critical components across various industries.

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