AlSr15 (EN 575)
Concentrated version of 15% strontium modifier. Greater efficiency and lower addition volume per ton.
AlSr15% is the concentrated version of the eutectic silicon modifier, with 15% strontium instead of the standard 10%. The higher Sr concentration allows reducing the material volume added to the melt by ~33%, which reduces metal cooling and the amount of dross generated. The metallurgical effect is identical to AlSr10%: modification of eutectic Si from acicular to fibrous. Preferred in high-volume operations where addition efficiency matters.
Chemical Composition
| Element | Symbol | Percentage |
|---|---|---|
| Aluminum | Al | Balance (~85 %) |
| Strontium | Sr | 14.0–16.0 % |
| Iron | Fe | ≤ 0.25 % |
| Silicon | Si | ≤ 0.20 % |
Physical Properties
| Property | Value |
|---|---|
| Melting point | 650–700 °C |
| Density | ~2.55 g/cm³ |
| Form | Waffle o barra cortada |
Metallurgical Function
Same function as AlSr10%: eutectic Si modification. The higher concentration allows lower addition volume, less melt cooling, and less dross generation during operation.
Dosage & Usage
Target residual: 0.015–0.040% Sr. Typical addition: 0.7–1.7 kg/ton (~33% less than AlSr10%). Same temperature and dissolution time parameters as the 10% version.
Applications
- Same applications as AlSr10%, preferred for high volume
- Operations seeking to minimize melt cooling
- Foundries with automated dosing systems
Industries
Automotive (High Volume)
Auto parts foundries with continuous A356/A360 production
Aluminum Casting
High-volume operations where addition efficiency is a priority
Special Notes
Same precautions as AlSr10%: control hydrogen porosity with adequate degassing. AlSr15% can be slightly more brittle than the 10% version, handle with care. Choose between 10% and 15% depending on production volume and addition system.
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