FeSi75 (ferrosilicon 75%) is a high-end ferroalloy with a stable silicon (Si) content of 75-80%, the remainder being primarily iron (Fe) and strictly controlled trace elements. With its superior deoxidation efficiency, alloying ability, and inoculation effect, it is an indispensable raw material for the production of high-quality steels (such as high-strength steel and electrical steel) and high-grade cast irons (such as ductile iron), exhibiting significantly better performance than low-silicon varieties (such as FeSi65).

FerroSilicon 75% is produced via electric arc furnace smelting using high-purity raw materials:

Silica (SiO₂ ≥98%): Ensures high silicon yield and minimal impurities.

Low-ash coke (fixed carbon ≥85%): Acts as a reducing agent to minimize carbon contamination.

Iron scrap (low P/S): Controls harmful elements in the final alloy.

The smelting process operates at 1800–2000°C, with precise temperature control to avoid silicon loss. Post-smelting, the alloy is crushed into lumps (10–50mm) or ground into powder (50–200 Mesh), with magnetic separation to remove iron-rich impurities-ensuring consistent quality.

FerroSilicon 75

Critical Specifications of FerroSilicon 75

Project	Specifications	Instructions and Selection Recommendations
Chemical composition	Si: 75-80%, Al ≤2.0%, Ca ≤0.5%, C ≤0.2%, P ≤0.04%, S ≤0.02%	Low-aluminum and low-carbon grades are suitable for electrical steel; low-calcium grades are beneficial for the purity of molten steel.
Physical form	Blocks (10-50mm), granules (1-10mm), powders (0-1mm, 50-200 mesh, etc.)	For ladle additives, choose lumps/granules; for casting inoculation, choose powders; for spray blowing, choose specific fine powders.
Packaging	Tonn bags (approximately 1000 kg/bag), or customized according to customer requirements.	Moisture-proof packaging to ensure product dryness.

Summary of the core advantages of FeSi75:

Higher efficiency: High silicon content results in stronger deoxidation and alloying capabilities, leading to more economical usage.

More stable performance: Strict impurity control (low aluminum, low calcium, low carbon, low phosphorus and sulfur) meets the stringent purity requirements of high-end steel grades.

Wideer application range: Spanning multiple key industrial sectors including steel, casting, non-ferrous metals, and refractories.

Comprehensive form range: Multiple size options precisely match different production processes (converter/electric furnace, in-furnace/ladle addition, inoculation treatment, etc.).

Industrial Applications of FerroSilicon 75

Steelmaking: Advanced Deoxidation & Alloying

High-Strength Low-Alloy Steel

Application: Used in automotive crash structures, crane booms, and high-rise building frames. Add 1.2–2.0 kg/ton of 10–50mm FeSi 75 during ladle refining.
Performance: Reduces dissolved oxygen from 80–100 ppm to ≤20 ppm, while alloying with silicon (0.5–1.0% Si) increases tensile strength by 15–20% (e.g., from 500 MPa to 575–600 MPa for Q690 steel).

Electrical Steel (Transformer & Motor Cores)

Critical for grain-oriented electrical steel (GOES) requiring precise silicon content (3.0–3.5%). Use 50–100 Mesh FeSi 75 powder for uniform alloying.

Casting: Premium Inoculation for High-Quality Iron

Gray Iron:

Add 0.3–0.5% of 50–100 Mesh FeSi 75 to molten iron (1400–1450°C) to promote fine, uniform Type A graphite. This increases tensile strength from 220 MPa to 300–320 MPa, ideal for machine tool beds and pump housings.

Ductile Iron:

Post-magnesium nodularization, 0.1–0.2% FeSi 75 powder enhances graphite spheroidization rate from 85% to 95%, reducing scrap rates in automotive crankshaft production by 30%.

Magnesium Smelting & Refractories

Pidgeon Process:

FeSi 75 (10–30mm lumps) acts as a reducing agent for magnesium production, with a silicon utilization rate of 85–90% (5–10% higher than FeSi 65), lowering raw material costs by 8–12%.

Refractory Binders:

Fine FeSi 75 powder (200 Mesh) is mixed with alumina to form silicon-rich refractories, resisting 1600°C molten slag erosion-extending steel ladle service life by 30% vs. conventional refractories.

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FerroSilicon 75 vs. Lower-Grade FerroSilicon

Attribute	FerroSilicon 75	FerroSilicon 65	FerroSilicon 50	Best For
Silicon Content	75–80%	65–70%	50–55%	High-performance steel/casting vs. bulk steel vs. low-cost castings.
Deoxidation Efficiency	90–95%	75–80%	60–65%	Precision steel (electrical/automotive) vs. structural steel vs. general castings.
Alloying Capability	Excellent (Si 0.5–3.5%)	Good (Si 0.3–1.0%)	Limited (Si ≤0.5%)	Electrical steel/ low-alloy steel vs. gray iron.

FAQ

Q: What are the main differences between FeSi75 and FeSi65?

A: The core difference lies in silicon content and efficiency. FeSi75 has a higher silicon content, resulting in approximately 15-20% improved deoxidation and alloying efficiency. It also offers better cost-effectiveness per unit of silicon, making it particularly suitable for high-end products with stringent performance requirements.

Q: How to determine the appropriate addition amount?

A: Process calculations are required based on factors such as the final composition requirements of the target steel grade or cast iron, the smelting process, and the initial composition. Generally, the addition amount for steel deoxidation and alloying is 1-3 kg/ton of steel, and for cast iron inoculation, it is 0.1-0.4%. We can provide technical support.

Q: What precautions should be taken when storing it?

A: It should be stored in a dry, well-ventilated warehouse, strictly preventing moisture. Special care should be taken with powdered products to avoid affecting their performance and safety.

Contact us today for a customized quote and technical datasheet-elevate your metallurgical processes with 75# FerroSilicon!

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