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.
