Chemical Composition (%)
| Ni | 4.0~5.0 |
|---|---|
| Al | 8.5~10.0 |
| Fe | 4.0~5.0 |
| Mn | 0.8~2.5 |
| Cu | Balance |
Mechanical & Physical Properties
| Tensile strength | ≥630 MPa (sand cast; the standard lists no chill-cast values) |
|---|---|
| Elongation | ≥16% (sand cast) |
| Hardness | ≥160 HBW (sand cast) |
Typical Applications
Grade Overview
The classic nickel aluminium bronze, the mainstay for ship propellers, seawater pumps and valves, bearings, gears and worm wheels, and it also serves below about 400 °C. Nickel and iron refine the structure and suppress slow-cooling embrittlement, so the alloy reaches high strength without losing toughness: sand-cast tensile strength of at least 630 MPa, elongation of at least 16% and hardness of at least 160 HBW. Seawater corrosion resistance, resistance to impingement and corrosion-fatigue performance are all outstanding. The cost is the high demand on melting and casting practice, since segregation and slag inclusions strongly affect properties, plus poor brazing and average machinability. Specify it for large, high-strength, corrosion-resistant castings; control composition and heat treatment closely, and avoid galvanic coupling with dissimilar metals in corrosive service. Casting soundness matters more than usual because the alloy is often used for large parts such as propellers, where internal defects are costly to find; a consistent melting and casting procedure is the best protection.
Data compiled from current standards; for selection reference only. Ordering is subject to the standard and the mill certificate.