Aluminum-Strontium

Aluminum–Strontium (AlSr) master alloy modifies the Al–Si eutectic from coarse plates to fine fibers. The result is better elongation, impact toughness, and surface finish. Controlled additions, such as ALSr10, also enhance fluidity and help reduce hot tearing. With appropriate refining and degassing practices, porosity can be lowered.

Benefits

• Stable modification with lower fade than sodium-based treatments.




• Higher tensile strength and elongation in AlSi7–AlSi12 families.




• Improved pressure tightness for die casting.




• Cleaner fracture surfaces that support machining and finishing.

Grades and Forms

• ALSr10 (10% Sr): efficient dosing for medium to large melts and automated feeders.




• ALSr5 (5% Sr): finer control for smaller furnaces or manual charging.




• Custom Sr levels and product geometries: waffles, cut ingots, rods, shots, and tablets.

Packaging is moisture-controlled with clear heat numbers and full lot traceability. These measures support consistent results and lean furnace-side handling.

Quality and Standards

• Tight Sr control with low oxides and impurities for uniform dissolution.




• Each heat verified by spectral analysis; certificates report composition and trace elements.




• Produced under IATF 16949:2016, ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018.

R&D Capability

We hold a broad patent portfolio and contribute to national standards for aluminum alloy additives. Development focuses on cleanliness, dissolution kinetics, and fade resistance. Advanced furnaces and analyzers support consistent refinement in Al–Si applications.

Application Guidance

• Addition rates: target a few hundred ppm Sr, adjusted for alloy chemistry (e.g., AlSi10Mg) and the desired level of modification.




• Introduction: preheat and add under a cover to promote fast dissolution and uniform distribution.




• Holding: monitor modification fade during melt holding. Re-dose if the melt remains at temperature for extended periods.

Compatible Alloys and Processes

This modifier suits gravity casting, sand casting, and high-pressure die casting across AlSi7–AlSi12 systems. It improves fluidity, reduces hot tearing, and supports thin-wall, pressure-tight components and complex geometries.

Integrated Solutions

Combine AlSr with AlTiB grain refiners to achieve fine grains and stable properties. Use appropriate fluxes and degassing to minimize hydrogen and inclusions for cleaner melts.

Supply and Support

Manufacturing footprint:

• Harbin HQ (23,000 m²) with a provincial R&D center.




• Anhui plant (133,333 m²) with integrated capacity for master alloys, AlTiB, and tablets.




• Two Cangzhou sites, including an A‑level R&D institution with full inspection and analysis.

Equipment:

• Mixers, presses, drying ovens, spectral analyzers, reduction furnaces, and muffle furnaces support consistent quality.

Logistics:

• Eight distribution centers and regional warehouses in Fujian, Jiangsu, Chongqing, and Guangdong enable timely delivery and replenishment.

Support:

• Application engineers offer dosing guidance and melt practice recommendations.




• Full inspection records and traceable lots provide confidence in every charge.

Contact

Tell us your target silicon morphology and mechanical goals, and request a quote.