Silicon Metal 421
Products Description
Silicon Metal 421 is the "low-aluminum upgrade" of 441 - keeping Fe≤0.4% and Ca≤0.1% while cutting Al to ≤0.2% (half of 441's level). This tighter aluminum control makes 421 the preferred grade for silicone synthesis, high-end aluminum alloys, and special steel smelting where aluminum poisoning or alumina inclusions cannot be tolerated. ISO 9001 certified, 3000+ MT monthly capacity, FOB Huangpu reference price USD 1450-1500/MT. Available as lump, granule, and powder in customized sizes.
Chemical Composition
|
Element 元素 |
Silicon Metal 421 |
Silicon Metal 441 (ref) |
Silicon Metal 3303 (ref) |
|---|---|---|---|
|
Si (%) |
≥ 99.0 (typ. 99.2-99.3) |
≥ 99.1 |
≥ 99.37 |
|
Fe (%) |
≤ 0.40 |
≤ 0.40 |
≤ 0.30 |
|
Al (%) |
≤ 0.20 (half of 441) |
≤ 0.40 |
≤ 0.30 |
|
Ca (%) |
≤ 0.10 |
≤ 0.10 |
≤ 0.03 |
|
P (ppm) |
≤ 30-100 |
- |
≤ 25-60 |
Physical properties:
Melting Point: 1410-1420°C.
Density: 2.33 g/cm³ (20°C).
Appearance: Silvery-gray metallic lumps with brilliant metallic luster, hard and brittle.
Particle Size
Standard lump sizes: 10-50mm, 10-60mm, 10-100mm (90% min on-size)
Granules: 1-6mm, 2-15mm, 3-10mm (for precision dosing)
Powder: 0-1mm, 0-3mm, 0-10mm, 100-200 mesh (for chemical synthesis & silicone reactors)
Custom sizing: Tailored to your furnace type, reactor, or alloying process
Quality: Uniform particle distribution, low fines (<5% below nominal size), no surface cracking or oxidation
Product Advantages
1.Precise Aluminum Alloy Control - Lower incoming Al means tighter composition control for A356 wheels, 6061 profiles, and other high-end castings/extrusions.
2.Stable Si Content (≥99.0%) - Fluctuation within ±0.3%; no formula recalibration needed batch-to-batch.
3.Full Traceability - Every batch ICP-tested, COA/MTC-documented, pre-shipment SGS/BV inspection welcome.
Packaging, Shipping & Certification
Packaging:
1000 kg (1 MT) UV-resistant waterproof jumbo bags on pallets, 20-24 bags per 20' FCL (~20-24 MT)
25 kg PP bags → palletized into 1 MT master bag
Iron drums available for high-purity powder grades
Custom packaging & private labeling supported
Certification:
ISO 9001:2015, COA (Certificate of Analysis) / MTC (Mill Test Certificate) / MSDS with every shipment
Company Strength
1.Monthly Capacity: 3000+ MT Silicon Metal (all grades combined, including 421)
2.Production: Submerged arc furnace smelting + multi-stage crushing & screening lines
3.Grades in Stock: 553, 441, 421, 411, 3303, 2202, 1101, 1501 - full grade coverage
4.Service: Free samples (1kg), technical consulting, packing/loading photos provided, efficient logistics
Service Sales
1. We promise to be honest and fair, and we are honored to be your purchasing consultant.
2. We guarantee punctuality, quality, quantity and strict implementation of contract terms.
Our Company
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