BM 340
Duplex-structure alloy (13.5–14% Al) with 1,230–1,351 MPa compressive strength, optimized for forming mandrels and drawing tools.
Chemical composition
| Copper | Remainder |
|---|---|
| Aluminum | 13.5–14.0% |
| Iron | 4.5–5.0% |
| Manganese | 2.0–2.3% |
| Nickel | máx. 0.5% |
| Cobalt | máx. 0.5% |
| Others | máx. 0.5% |
Mechanical properties
| Tensile strength | 586–724 MPa |
|---|---|
| Yield strength | 427–531 MPa |
| Elongation | 0.0–0.5 % |
| Rockwell C hardness | 32–36 |
| Compressive strength | 1230–1351 MPa |
| Density | 7.10 kg/dm³ |
Informational values. Vary by manufacturing process, geometry, and dimensions.
Formats
Typical applications
- Tube-forming mandrels and rollers
- Deep-drawing dies
- Extractor bushings
- Plastic mold cores
- Components requiring high wear and compression resistance
Manufacturing processes
- Extrusion
- Forging
Aluminum bronze alloys
- BM 863
High-strength copper-zinc-aluminum-manganese alloy balancing hardness, ductility, and corrosion resistance for critical mechanical components.
- BM 954
Aluminum-iron bronze with excellent balance between fatigue resistance, wear, and ductility — the family reference for structural parts and molds.
- BM 300
High-aluminum bronze (12.5–13.5%) with very high compressive strength, designed for guide bushings, wear plates, and operations without continuous lubrication.
- BM 959
BM 300 variant tuned for tube-forming, bending rollers, and similar non-impact operations.
- BM 380
Special ultra-hard alloy (36–40 HRC) with compressive strength up to 1,579 MPa for precision stamping dies and deep-drawing tooling.