Aluminum-Silicon

Aluminum-Silicon master alloys are widely used in 4000-series aluminum for their fluidity, castability, reduced shrinkage, and stable properties in precision casting and welding. Since 1995, we have developed and supplied consistent Al‑Si additives backed by IATF 16949:2016, ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018. Our advanced R&D, four production bases, and role in drafting national standards for aluminum alloy additives support reliable supply to melt shops and OEM programs worldwide.

Grades and Compositions

Our range covers hypoeutectic to hypereutectic:

• ALSi12 (~11–13% Si): balanced castability, strength, and low hot cracking for general-purpose castings.




• ALSi20 (~18–22% Si): improved wear resistance and dimensional stability for sliding parts.




• ALSi24 (~22–26% Si) and ALSi30 (~28–32% Si): high fluidity and low shrinkage for complex molds and thin walls.




• ALSi50 (~48–52% Si): specialized hypereutectic option for wear-critical components.

Chemistry can be tailored with tight impurity control to match melt cleanliness and downstream performance targets.

Typical Chemistry Windows

• ALSi12: Si 11–13%; Fe ≤0.25%; Cu ≤0.10%; Mn ≤0.10%; Ti ≤0.05%




• ALSi20: Si 18–22%; Fe ≤0.30%; Cu ≤0.10%; Mn ≤0.10%; Ti ≤0.05%




• ALSi24: Si 22–26%; Fe ≤0.30%; Cu ≤0.10%; Mn ≤0.10%; Ti ≤0.05%




• ALSi30: Si 28–32%; Fe ≤0.35%; Cu ≤0.10%; Mn ≤0.10%; Ti ≤0.05%




• ALSi50: Si 48–52%; Fe ≤0.40%; Cu ≤0.10%; Mn ≤0.10%; Ti ≤0.05%

Values are indicative; tighter limits are available on request.

Product Forms and Packaging

We supply ingots, waffle bars, notched slabs, and shot/lump for fast dissolution and accurate dosing. Standard packaging uses strapped pallets with moisture protection and heat numbers for traceability. Unit weights support melt shop ergonomics and automated addition, promoting clean additions and predictable recovery.

Casting Applications and Performance

Al‑Si casting alloys offer superior fluidity and low hot cracking in die casting, sand casting, and gravity casting of complex parts. Typical uses include engine blocks, cylinder heads, pistons, transmission housings, pump bodies, and components requiring wear resistance and dimensional stability. Optimized microstructures help achieve good surface finish, reduced porosity, and consistent mechanical properties.

Hypoeutectic vs Hypereutectic Selection

Hypoeutectic (<12.6% Si) balances fluidity and ductility for general-purpose castings. Eutectic (~12.6% Si) provides a sweet spot for flow, fill, and shrinkage control. Hypereutectic (>12.6% Si) increases wear resistance through primary silicon particles and is often chosen for pistons, compressor parts, and other sliding components. Select ALSi12, ALSi20, ALSi24, ALSi30, or ALSi50 to match application needs and finishing processes.

Process Aids: Grain Refiners, Modifiers, Fluxes

• AlTiB grain refining: promotes fine, equiaxed alpha-aluminum grains, improving feeding, lowering hot tearing, and supporting consistent properties across sections.




• AlSr modification: refines silicon from coarse plates to fibrous morphologies, improving elongation and impact resistance while maintaining flow.




• Refining and degassing fluxes: remove oxide films and inclusions and reduce hydrogen to prevent porosity, improving mechanical reliability and pressure tightness.

Quality Assurance and Traceability

Each batch is verified by spectral analysis and metallography, with heat numbers and certificates for full traceability. Our recognition as a national high-tech enterprise, 100+ patents, and role as an industry standard drafter underpin rigorous process control and reliable deliveries.

Customization and Technical Support

Our A-level R&D institution and provincial-level centers tailor chemistry, addition forms, and treatment packages to your casting goals. We offer sampling, process trials, and on-site guidance to stabilize fluidity, solidification, and mechanical targets. Contact us to request a quote or discuss your application.

Logistics and Global Delivery

With four production bases, eight distribution centers, and warehouses in Fujian, Jiangsu, Chongqing, and Guangdong, we provide responsive delivery. Stable capacity, including a 120,000 t/y plant, supports large programs. Shipments to ~40 countries help maintain supply continuity.

Fast-Melting Silicon for On-Line Adjustments

Fast-melting silicon enables precise on-line additions with high dissolution rates, helping reduce cycle time and improve recovery. It maintains target ALSi12–ALSi50 windows without over-alloying and supports lean, flexible operations.