Ferro Silicon

FeSi 65–75%

Overview

What is Ferro Silicon?

Ferro Silicon is an iron-silicon alloy produced in submerged arc furnaces by reducing quartz with coke in the presence of iron. It is one of the most widely used ferro alloys in global steel and foundry production.

As a deoxidizer and alloying agent, FeSi improves steel strength, hardness, and resistance to corrosion and heat. In cast iron production it acts as an inoculant, improving graphite structure and mechanical properties.

Primary Applications

Steel Deoxidation

Removes dissolved oxygen from molten steel, preventing porosity and improving final product quality.

Alloying Agent

Enhances tensile strength, hardness, and high-temperature resistance in structural and tool steels.

Cast Iron Inoculant

Controls graphite morphology in grey and ductile iron, improving machinability and impact resistance.

Silicon Metal Production

Used as a source material in chemical and semiconductor-grade silicon refining processes.

Chemical Composition

Grades We Supply

Grade Si % Al % Ca % P % S % C %

FeSi 65 63–67 ≤ 1.5 ≤ 0.5 ≤ 0.04 ≤ 0.02 ≤ 0.1

FeSi 70 68–72 ≤ 1.5 ≤ 0.5 ≤ 0.04 ≤ 0.02 ≤ 0.1

14 Si Silicon 28.086

26 Fe Ferrum 55.845

13 Al Aluminum 26.982

20 Ca Calcium 40.078

15 P Phosphorus 30.974

Logistics & Supply

Packaging & Delivery

Sizing

Available in lump (10–100mm), granule (1–10mm), and powder (<1mm) forms depending on application requirements.

Packaging

1MT big bags (jumbo bags) or 25kg small bags on pallets. Custom packaging available on request.

Shipment

FCL or LCL containers. Bulk vessel shipments available for large tonnage. Origin: CIS, China, Europe.

Documentation

Full set: Certificate of Analysis, Certificate of Origin, SGS inspection report, packing list, commercial invoice.