Chemical Composition (%)
| Al | 3.9~4.3 |
|---|---|
| Cu | ≤0.10 |
| Mg | 0.025~0.06 |
| Fe | ≤0.035 |
| Zn | Balance |
Mechanical & Physical Properties
| Tensile strength | ≥268 MPa (as die-cast) |
|---|---|
| Elongation | ≥6% |
| Hardness | ≈82 HBW |
| Density | 6.6 g/cm³ |
Typical Applications
Grade Overview
ZZnAl4-1 is the Chinese designation for the ZAMAK 3 type die-casting zinc alloy, corresponding to UNS Z35531. With about 4% aluminium, 0.025-0.06% magnesium and tightly controlled impurities, it gives an excellent balance of castability, dimensional stability, strength and surface finish. Die castings reach at least 268 MPa tensile strength, 6% elongation and about 82 HBW, at a density of 6.6 g/cm³.
Selecting ZZnAl4-1
Choose ZZnAl4-1 for die-cast structural parts, locks and handles, electrical and appliance housings, automotive small parts, sanitary fittings and decorative components. It is the most widely used zinc die-casting alloy. Where higher strength and wear resistance are needed, ZA303 or ZZnAl27Cu2Mg is better; where thin walls and fine detail dominate, ZZnAl4-1 remains the practical choice.
Working with ZZnAl4-1
The alloy is designed for hot-chamber die casting. Control melt temperature and keep aluminium and magnesium within the specified range; iron and lead impurities must be kept low to avoid embrittlement and poor dimensional stability. Castings can be machined, polished and plated. Avoid prolonged high-temperature service, where zinc alloys creep.
Frequently asked questions about ZZnAl4-1
Is ZZnAl4-1 the same as ZAMAK 3?
Yes. It is the GB/T 13818 designation for the ZAMAK 3 composition, UNS Z35531.
Can it be used for bearings?
No. It is a general die-casting alloy; for bearing duty use ZA303 or a copper-based bearing alloy.
Why is magnesium controlled so tightly?
Magnesium controls grain size and dimensional stability. Too little causes instability, too much causes casting difficulty and brittleness.
Data compiled from current standards; for selection reference only. Ordering is subject to the standard and the mill certificate. Data source: Shenyang Yuheng Metal Manufacturing Co., Ltd. — yuhengmetal.com.