Chemical Composition (%)
| Cu | 60.0~66.0 |
|---|---|
| Al | 4.5~7.0 |
| Fe | 2.0~4.0 |
| Mn | 1.5~4.0 |
| Zn | Balance |
| Si (impurity) | ≤0.10 |
| Pb (impurity) | ≤0.20 |
| Sn (impurity) | ≤0.20 |
| Ni (impurity, not counted in impurity total) | ≤3.0 |
Mechanical & Physical Properties
| Tensile strength | ≥740 MPa (chill cast) |
|---|---|
| Yield strength (sigma 0.2) | ≥400 MPa (chill cast) |
| Elongation (delta) | ≥7% (chill cast) |
| Hardness | ≥170 HBW (chill cast) |
| Density | ≈8.5 g/cm³ |
Typical Applications
Grade Overview
A multi-element strengthened cast aluminium-manganese brass whose strength and hardness are the highest among cast brasses, used for bridge bearing plates, nuts and screws, wear plates and slide blocks, worm wheels, bearing shells and bushings, and valve stems and high-pressure valve bodies. Aluminium, iron and manganese form hard phases and strengthen in solid solution, so casting behaviour is good, corrosion resistance is reasonable and the alloy is weldable, with tensile strength of at least 740 MPa, yield strength of at least 400 MPa, elongation of at least 7% and hardness of at least 170 HBW in chill castings; wear resistance is excellent. The drawback is modest elongation and a tendency to stress-corrosion cracking. Use it for high-strength, high-wear pressure and wear parts; stress-relieve after welding or cold working, avoid sustained tensile stress in damp, ammonia-bearing environments, and control impurity content to keep properties stable. It is a cost-effective alternative to the aluminium bronzes where high strength and wear resistance matter more than ductility, and it both casts and machines well.
Data compiled from current standards; for selection reference only. Ordering is subject to the standard and the mill certificate.