TECHNICAL PROPERTIES, QUALITY CONTROL GUDELINES and NORMS

These are the result of research developed by the main manufacturers in the world to obtain alloys with high general properties of resistance to be used in sand-casting, die-casting, centrifugal casting and pressure die-casting, in both hot (8) and cold (12 and 27) chambers.
Zn-Al alloys (8,12 and 27) manufactured by Simar comply with the standard EN 1774. These alloys are used increasingly to replace copper and aluminium alloys, in relation to which, although maintaining the same fundamental mechanical properties, are advantageous in terms of costs, melting specifications and subsequent finishing operations.

SIZIN 8
The alloy SIZIN 8 can be cast in sand or die-cast. However, its main uses are found mainly in hot chamber pressure die-casting. In addition to the advantage of being more resistant than traditional Zamas alloy, its best quality is its high creep resistance at temperatures ranging from 100 to 150°C. Among zinc alloys which can be cast in hot chamber, SIZIN 8 is with no doubt the most resistant and the one with the highest degree of hardness. It does not cause problems during surface finishing using the most common electrolytic or chemical processes.

SIZIN 12
The alloy SIZIN 12 has the following advantages:
general resistance properties that are higher than many non-ferrous gravity-cast alloys, with the exception of aluminium and manganese bronzes, comparable with the properties of a large number of cast irons. Its specific weight lower than copper alloys and other zinc alloys. High castability which allows a greater number of pieces and complicated details to be obtained with a surface porosity which is lower than any piece cast with other ferrous and non-ferrous alloys. Much less finishing operations required to prepare pieces for electrolytic plating. Aptitudes to finishing with electrolytic procedures (copper-plating, nickel-plating,chrome-plating and others), due to the minimum surface porosity. Properties that are exceptionally stable through time (resistance to ageing). Excellent dimensional stability. High degree of workability with machine tools. Casting of complicated pieces which cannot be gravity-cast using other alloys. As it is an anti-friction alloy, it can replace bronze in producing bushings and bearing brasses.

SIZIN 27
The alloy SIZIN 27 was developed in recent years and has rapidly been placed owing to its noteworthy properties of tensile and yield breaking strength, and resistance to wear. The fact that it is easily worked with machine tools, can be subjected to surface treatments (electroplating, painting, chroming, anodising) and also welds well, makes it an extremely versatile alloy, which is also cost-friendly.

 

STANDARDS OF REFERENCE

ALLOYS	European standard	Alloy  Symbol	Alloy  Number
SIZIN 8	EN 1774	ZnAl8Cu1	ZL0810
SIZIN 12	EN 1774	ZnAl11Cu1	ZL1110
SIZIN 27	EN 1774	ZnAl27Cu2	ZL2720