FerroSilicon 65 (FeSi65) is a general‑purpose ferroalloy with silicon content 63–68% and balanced iron and impurities. Produced via submerged arc furnace smelting, refining, crushing, and screening, it offers outstanding cost performance, stable reactivity, and high utilization rate.

It is widely used as a deoxidizer, alloying agent, inoculant, and reducing agent in steelmaking, gray iron, ductile iron, magnesium smelting, welding materials, and mineral processing, making it the most economical choice for bulk metallurgical production.

FerroSilicon 65

Critical Specifications of Ferro Silicon 65

Parameter	Range	Industrial Significance
Silicon (Si)	63–68%	Balances reactivity and cost (65% is optimal for bulk steelmaking) .
Iron (Fe)	28–32%	Ensures structural stability without diluting silicon efficiency.
Impurities (Max.)	Al ≤2.0%, Ca ≤1.0%	Prevents brittle inclusions in steel; Al aids casting nucleation .
	C ≤0.2%, P ≤0.04%	Avoids carburization (low-carbon steel) and cold brittleness .
	S ≤0.02%	Reduces hot cracking in castings.
Size	10–50mm (lump)	Standard for steel ladle addition (minimizes dust loss).
	1–3mm (grain)	Ideal for casting inoculation (uniform dispersion).
	200–325 Mesh (powder)	Used in welding rods and mineral processing .

10–50mm lump: steelmaking ladle addition (low dust)

1–3mm grain: casting inoculation (fast dissolution)

200–325 mesh powder: welding electrodes & mineral processing

Industrial Applications of 65 FerroSilicon

1) Steelmaking Deoxidation & Alloying

Used in converter & electric furnace steelmaking for deep deoxidation

Reduces oxygen from 80–100ppm to ≤25ppm

Enhances strength & toughness of low‑alloy steel & structural steel

Dosage: 1.5–3.0 kg per ton steel

2) Gray & Ductile Iron Inoculation

Promotes Type A graphite in gray iron, improves strength & machinability

Supplements silicon loss after spheroidization in ductile iron

Increases nodularity rate & reduces shrinkage defects

Dosage: 0.3–0.6% for gray iron; 0.1–0.2% for ductile iron

3) Magnesium Smelting (Pidgeon Process)

Used as a reducing agent to reduce magnesium ore

Lower cost than FeSi75, reduces raw material cost by ~12%

Maintains magnesium yield ≥90%

4) Welding Electrode Coatings

Powder grade used as deoxidizer & alloying component

Improves weld strength, plasticity, & crack resistance

Mesh size: 200–325 mesh

5) Mineral Processing & Heavy Media

Used as heavy media powder for ore gravity separation

High density, stable performance, adjustable proportion

6) Other Metallurgical Uses

Raw material for silicon‑based master alloys

Reducing agent for low‑grade ferroalloys

Additive for wear‑resistant & heat‑resistant castings

FerroSilicon 65

Why Choose FerroSilicon 65 Over Other Grades?

Grade	Si Content	Key Advantage	Best For
FeSi 65	63–68%	Balances reactivity & cost	Bulk steel, casting, Mg smelting
FeSi 75	72–78%	High deoxidation efficiency	High-strength steel, electronics
FeSi 45	40–50%	Low cost	Low-grade castings