Products Description
Silicon Metal 553 is the most widely traded grade of metallurgical silicon, offering an optimal balance of purity, performance, and cost-effectiveness. Produced by carbothermic reduction of high-purity quartz in submerged arc furnaces, this grade contains approximately 98.5% silicon with controlled limits on iron, aluminum, and calcium. It serves as the essential raw material for aluminum alloys, silicones, semiconductors, and chemical applications worldwide.
Chemical Composition & Specification
| Parameter | Specification (Standard) | Premium Grade Option |
|---|---|---|
| Silicon (Si) | ≥ 98.5% | ≥ 98.7% |
| Iron (Fe) | ≤ 0.50% | ≤ 0.40% |
| Aluminum (Al) | ≤ 0.50% | ≤ 0.40% |
| Calcium (Ca) | ≤ 0.30% | ≤ 0.10% |
| Phosphorus (P) | ≤ 0.005% | ≤ 0.003% |
| Sulfur (S) | ≤ 0.002% | ≤ 0.001% |
| Carbon (C) | ≤ 0.15% | ≤ 0.10% |
Available Sizes:
10–50 mm (standard lump)
10–100 mm (for aluminum alloying)
0–10 mm (powder for chemical synthesis)
Custom sizes available upon request
Packaging Options:
1 MT jumbo bags
25 kg woven bags with inner plastic liner
Bulk container loading (20-25 MT per 20' container)
Key Properties & Performance Characteristics
Silicon Metal 553 offers a unique combination of physical and chemical properties that make it indispensable across multiple industries.
High Purity Base – With minimum 98.5% silicon content, this grade provides sufficient purity for most industrial applications without the premium cost of higher grades (e.g., 441, 3303, 2202). The controlled impurity levels ensure predictable behavior during downstream processing.
Excellent Alloying Behavior – Silicon Metal 553 dissolves readily into molten aluminum, forming aluminum-silicon alloys with enhanced castability, strength, and wear resistance. The low iron content minimizes formation of brittle intermetallic compounds that could reduce ductility.
Chemical Reactivity – The material reacts efficiently with methyl chloride in the direct synthesis process to produce chlorosilanes, the precursors for silicone polymers. Consistent particle size distribution optimizes fluidized bed reactor performance.
Thermal Stability – Silicon Metal 553 maintains structural integrity up to its melting point (1414°C), making it suitable for high-temperature applications including refractory materials and metallurgical processes.
Main Applications & End-Use Industries
Silicon Metal 553 serves as a critical raw material across four primary industry sectors:
Aluminum Alloy Production (Largest Consumer ~50%)
The aluminum industry represents the dominant market for Silicon Metal 553. When added to molten aluminum, it improves fluidity, reduces solidification shrinkage, and enhances mechanical properties. Common end products include:
- Automotive engine blocks and cylinder heads
- Wheel rims and structural components
- Architectural extrusions and window frames
- Cast cookware and household appliances
Silicone & Chemical Manufacturing (~30%)
Silicon Metal 553 reacts with methyl chloride to form dimethyldichlorosilane, the primary monomer for silicone production. Silicones derived from this process appear in:
- Sealants, adhesives, and lubricants
- Medical implants and tubing
- Electrical insulation and thermal pastes
- Personal care products (shampoos, lotions)
Photovoltaic & Semiconductor (~15%)
While higher purity grades are required for final solar cell and semiconductor production, Silicon Metal 553 serves as the starting feedstock for polysilicon refinement. The material is upgraded through chemical vapor deposition or metallurgical processes to achieve 6N-11N purity.
Refractories & Specialty Alloys (~5%)
Silicon Metal 553 powder is used in:
- Silicon nitride (Si₃N₄) ceramic production
- Ferrosilicon alloy manufacturing
- Pyrotechnic compositions
- Abrasive materials
FAQ
Q: What particle size should I order?
A: It depends on your melting practice:
10–100 mm (standard lump): Best for furnace charging in induction or arc furnaces.
5–25 mm (small lump): Suitable for smaller furnaces or manual addition.
0–5 mm (powder/fines): Used for briquette pressing, or as a fine-grain additive.
0–1 mm / 1–3 mm: For ladle addition or wire feeding systems.
Contact our technical team for sizing recommendations based on your specific furnace type.
Q: What is the typical carbon content in Silicon Metal 553?
A: Our standard Silicon Metal 553 contains ≤0.10% carbon (typical 0.05–0.08%). Low-carbon versions (≤0.03%) are available for specialized steelmaking or polysilicon applications at a premium.
Q: Do you provide free samples?
A: Yes, we offer free 1–2 kg samples for qualified buyers. Shipping costs are borne by the buyer. Sample production and delivery typically take 5–7 days.
Q: What is your minimum order quantity (MOQ)?
A: Standard MOQ is 20 metric tons (one 20-foot container). Smaller quantities (5–15 MT) may be available for LCL (less than container load) shipment, subject to availability and additional logistics charges.
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