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.
Chemical composition
| Copper | Remainder |
|---|---|
| Aluminum | 12.5–13.5% |
| Iron | 3.0–5.0% |
| Manganese | máx. 1.5% |
| Nickel | máx. 0.5% |
Mechanical properties
| Tensile strength | 724–758 MPa |
|---|---|
| Yield strength | 407–420 MPa |
| Elongation | 0.5–1.5 % |
| Rockwell C hardness | 28–32 |
| Compressive strength | 1108–1230 MPa |
| Density | 7.20 kg/dm³ |
Informational values. Vary by manufacturing process, geometry, and dimensions.
Formats
Typical applications
- Guide bushings replacing hardened steel
- Wear plates
- Wear rings in stamping dies
- Forming rollers
- Dry-running service (graphite bronze substitute)
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 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.
- BM 340
Duplex-structure alloy (13.5–14% Al) with 1,230–1,351 MPa compressive strength, optimized for forming mandrels and drawing tools.