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Send EmailAlSr Master Alloy, AlSr10, AlSr15, AlSr20, Strontium Modifier Alloy, Sr Grain Modifier, 7446-09-5, 7429-90-5, 7439-89-6
🧪 1. Full Product Name
AlSr – Strontium-Based Modification Master Alloy Variants:
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AlSr10
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AlSr15
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AlSr20
🔢 2. CAS Numbers
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Strontium (Sr): 7446-09-5
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Aluminum (Al): 7429-90-5
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Silicon (Si): 7440-21-3
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Iron (Fe): 7439-89-6
Note: AlSr is a master alloy; no unique CAS number exists for the compound itself.
⚙️ 3. Technical Specifications
| Property | Value / Range |
|---|---|
| Sr Content | 9% – 22% |
| Si / Fe (max) | 0.3% |
| Physical Forms | Coil (Wire), Stick (Rod), Waffle Ingot |
| Density | ~2.7 g/cm³ (Al matrix) |
| Melting Point | ~660 °C |
| Packaging | Crate-protected waffle ingots, vacuum-sealed bags, or boxed coils/sticks |
🧭 4. Detailed Application Areas
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Used in AlSi (aluminum-silicon) alloys for eutectic phase modification.
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Strontium transforms needle-like eutectic Si into a globular morphology, improving mechanical properties.
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Essential in low-pressure die casting, gravity casting, and high-performance AlSi foundry applications.
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Applied in engine blocks, cylinder heads, pistons, wheels, structural profiles.
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Enhances ductility, fatigue resistance, and surface finish.
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Typical dosage: calculated to achieve 0.01–0.05% Sr in the melt.
🚨 5. Mandatory Use Cases
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Unmodified AlSi castings are prone to brittleness and cracking; Sr addition is technically mandatory.
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Automotive and aerospace sectors require Sr-modified microstructure for durability.
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Compliance with standards such as EN 1706, ASTM B179, DIN EN 1982 often necessitates Sr-based modification.
🧩 6. Sectoral Compatibility Table
| Sector | Compatibility | Notes |
|---|---|---|
| Automotive | ✅ | Mandatory for AlSi castings |
| Aerospace | ✅ | Used in high-performance aluminum components |
| Construction | ⚠️ | Limited use; depends on alloy type |
| Food Packaging | ❌ | Not suitable for food-contact alloys |
| Electronics | ⚠️ | Applicable in select thermal alloys |
🧾 7. Alternative Names
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AlSr Master Alloy
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AlSr10 / AlSr15 / AlSr20
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Strontium Modifier Alloy
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Sr Grain Modifier
🗣️ 8. Common Trade Names / Informal Terms
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Sr-modified alloy ingot
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AlSr waffle
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Strontium grain refiner
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AlSi modifier additive
🏭 9. Production Details
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Manufacturing Process: Strontium is alloyed into molten aluminum under controlled conditions, forming Al₄Sr phase that modifies eutectic Si.
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Producing Countries: China, Germany, India, Türkiye
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True Producers vs. Traders: Direct producers ensure consistent Sr content and phase stability. Trader-sourced products may vary in quality and origin.
Note: Consistent modification effect requires verified origin and phase analysis.
