FeSi

Ferro Silicon

Ferro Silicon (FeSi) is an iron-silicon master alloy used to control oxygen and adjust silicon content in molten steel and cast iron. As a deoxidizer, its silicon reacts with dissolved oxygen to form SiO2 that floats into the slag, raising cleanliness and improving yield of more reactive additions such as Mn and Al. In cast iron it shifts solidification toward graphite, countering chill and stabilizing the as-cast structure. This grade runs Si 72-78% (FeSi 75 basis) with Al ≤ 1.5%, C ≤ 0.10%, P ≤ 0.04%, and S ≤ 0.02% in 10-60 mm lumps. Typical use spans EAF and BF-BOF steel deoxidation, grey- and ductile-iron inoculation, silicon-steel production, and as feedstock for downstream ferroalloys. Deoxidation dosage commonly lands near 0.3-0.6 wt% for grey iron, adjusted to bath chemistry and oxygen activity. Tight C/P/S limits suit cleaner-steel routes; a 70-72 grade is available for grey-iron and inoculation work. Lots ship against COA (EN 10204 3.1) and MTC with XRF/ICP verification, conforming to ASTM A100 / ISO 5445, from multi-regional sourcing. Delivery options include CIF Marmara, Gebze bonded stock, and 20 MT FCL lots. Send your grade and tonnage for an RFQ.

Technical Specifications

Si	72-78%
Al	≤ 1.5%
C	≤ 0.10%
P	≤ 0.04%
S	≤ 0.02%
Size	10-60mm

Arsam Standard

Grades	FeSi 75 (Si 72-78%) · 70-72 grade (grey iron / inoculation)
International Reference	ASTM A100 · ISO 5445
Packaging	1 MT jumbo big bag · Palletized · FCL container
Documentation	COA (EN 10204 3.1) · MTC · Radiation certificate · CoO · EUR.1 / A.TR (EU)
Quality Control	XRF/ICP · 0.3-0.6 wt% grey-iron deoxidation dosage reference
Minimum Order	20 MT FCL / 5 MT LCL
Incoterms	FOB / CIF / CFR / DAP
Lead Time	Sea CIF 28-35 days · Gebze bonded stock 24-48h · alternative road/ferry 12-21 days

International standards are a reference basis; certificates provided on request with document verification.

Applications

Steel deoxidation

Cast iron inoculation

Ferroalloy production

Silicon steel

Frequently Asked Questions

What is the difference between Arsam FeSi 75 and the 70-72% grade?

FeSi 75% (Si 72-78%, Al ≤1.5%) is standard EAF deoxidation. The 70-72% grade fits grey iron + certain foundry inoculation applications, spec verification and line dosage calibration with Arsam technical support.

What should the FeSi dosage be for grey iron deoxidation?

Typical 0.3-0.6 wt% FeSi 75% (targeting bath Si 1.5-2.5%). For a 12 MT lot, approximately 50-72 kg FeSi. The foundry line metallurgy chief decides, for medium-to-large lines, our desk shares the dosage calculation template.

When is FeSi preferred over SiC as an inoculant?

FeSi 75 (Si 75%, Al ≤1.5%) for deoxidation + final inoculation only. If carbon demand + graphite nodularization matter, SiC (C 75-80%, Si 18-20%) is preferred. Most Turkish foundries use both at different stages.

What is the FeSi shipment lead time for TR foundries?

Sea freight CIF Gemlik 28-35 day logistics. If stock is available at the Gebze bonded warehouse, 24-48 hour rush delivery. Alternative road/ferry route 12-21 days.