MPS  /  MATERIALS  /  INDUSTRIAL POWDER  /  SILICON & FERRO-SILICON
Si
Z 14 · ATOMIC MASS 28.085

Silicon & Ferro-Silicon

Steelmaking, aluminum alloying, semiconductor-adjacent.   Metallurgical-grade silicon (Si-metal 99% and 98.5%), ferro-silicon (FeSi 75, 65, 45), and specialty silicon powder for steelmaking, aluminum alloying, and thermal-spray coatings.

Program Intake Program Tiers
Grades
Si-metal 99% / 98.5% · FeSi 75/65/45
Standards
ASTM A100 · A481
Sizes
Lump · granular · powder
Process
Submerged-arc furnace
Lead time
4 weeks standard
Sourcing
Norway · Iceland · Brazil
01METALLURGY

Silicon is the second-largest steelmaking deoxidizer after manganese. Ferro-silicon (FeSi 75) additions to every carbon-steel heat. Silicon metal (Si-metal 99%) is the primary alloying element in aluminum casting alloys (383, 356, 380) and the feedstock for polysilicon production for solar and semiconductor.

Global Si-metal production is concentrated in China (~70%). We source metallurgical-grade Si-metal from Norwegian (Elkem), Icelandic, and Brazilian smelters to avoid Chinese exposure. Ferro-silicon supply is more geographically diverse (Norway, Russia, U.S., India, South Africa).

02SPECIFICATION
Chemistry — Si-metal 99%
Si 99.0% min · Fe ≤ 0.5% · Al ≤ 0.4%
Chemistry — Si-metal 98.5%
Si 98.5% min · Fe ≤ 0.8% · Al ≤ 0.5%
Chemistry — FeSi 75
ASTM A100 · Si 74–79%, C ≤ 0.15%
Chemistry — FeSi 65
Si 63–68%, C ≤ 0.15%
Chemistry — FeSi 45
ASTM A100 · Si 44–48%, C ≤ 0.20%
Aluminum (impurity)
Grade-specific limits
Calcium (impurity)
Grade-specific limits
Sizes — lump
10–100 mm
Sizes — granular
0.2–10 mm
Sizes — powder
< 100 μm on request
Density
2.33 g/cm³ (Si-metal)
Traceability
Furnace heat → cast lot → PO
03GRADES & ALLOYS
Si-metal 99%
Aluminum alloying, silicone chemistry, polysilicon feedstock.
Si-metal 98.5%
General metallurgical use. Aluminum-alloy production.
FeSi 75
ASTM A100. Standard steelmaking ferrosilicon.
FeSi 65
Alternative grade. Cast-iron inoculation.
FeSi 45
Bulk deoxidation. Lower-Si applications.
CaSi (calcium silicide)
Deep desulfurization and inclusion modification.
SiMn (silico-manganese)
Dual-purpose steelmaking deoxidizer.
Nodularizing FeSi (FeSiMg)
Magnesium-bearing FeSi for ductile-iron nodularization.
04PROCESSING ROUTES
Ladle addition
Standard steelmaking. FeSi 75 primary deoxidizer after Al.
Cast-iron inoculation
FeSi 75 late addition for graphite nucleation.
Aluminum alloying
Si-metal addition to 3xx, 4xx cast aluminum.
Polysilicon Siemens process
Si-metal → SiHCl₃ → polysilicon feedstock.
Thermal spray
Si-metal powder for oxide-forming barrier coatings.
Silicone chemistry
Si-metal → dimethyldichlorosilane → silicone polymer.
05APPLICATIONS
Steelmaking
Deoxidation
FeSi 75 addition to every ladle heat.
Foundry
Cast-Iron Inoculation
FeSi 75 late-inoculation for gray and ductile iron.
Aluminum
Casting Alloys
Si-metal 99% for 356, 380, 383 casting alloys. Automotive engine blocks.
Electronics
Polysilicon Feedstock
Si-metal for solar and semiconductor polysilicon production.
Chemical
Silicone Polymers
Si-metal for organosilicon chemistry.
Aerospace
Coatings
Si-metal thermal-spray for oxidation-barrier coatings on turbine components.
06QUALITY CONTROL
Chemistry
ICP-OES for Si + all listed impurities
Sulfur/phosphorus
LECO on FeSi grades
Size distribution
Sieve analysis per lot
Bulk density
Per lot for lump and granular
Moisture
Karl Fischer on powder grades
Traceability
Smelter CofC per lot
Every lot ships with a mill-certified Certificate of Conformance (CofC) documenting chemistry, PSD, morphology, flow, and traceability from mill heat through atomization to PO. Retained samples are held per lot for program-life duration.

Move it to a
program.

MPS-1 qualification, MPS-2 production, or MPS-3 strategic supply. 4-week standard lead time on qualified stock.

Program Intake Compare Program Tiers