No. 7 alloy is a modification of #3 alloy in which lower magnesium content is specified in order to increase the fluidity. To avoid problems with inter-granular corrosion lower levels of impurities are called for and a small quantity of nickel is specified. Alloy #7 has slightly better ductility than #3 with other properties remaining at the same level.
The alloy is therefore popular for those special cases where the die caster is making thin walled components requiring a good surface finish. However, research testing has shown that metal and die temperatures have a bigger effect than changing alloys. Close attention to control of the die casting process parameters is important so as to eliminate defects and achieve consistent quality.
| Eastern Alloys, Inc. | |
|---|---|
| Product Category | Metal Shapes and Stock |
| Product Number | # 7 |
| Product Name | Die Casting Alloy |
| Type | Zinc; Alloy |
| Shape / Form | Ingot or Billet (optional feature); Semi-finished, Mill Stock or Near Net Shapes (optional feature); Standard Sow, Half Sow |
| Specifications | ASTM / ASME |
| Thickness | 1.5 to 18 inch (38.1 to 457 mm) |
| Width / OD | 2 to 22.8 inch (50.8 to 579 mm) |
