Ordinary 75% ferrosilicon typically contains 1%-2% aluminum, while our product's aluminum content is controlled below 0.3%.

Why invest the effort to reduce aluminum content? Because aluminum forms alumina inclusions in steel. These inclusions are hard and brittle, causing three problems:

Stamping cracking: This is the biggest concern for customers making automotive steel sheets.

Reduced fatigue life: This is a major concern for customers making spring steel and bearing steel.

Continuous casting nozzle blockage: Alumina can adhere to the inner wall of the nozzle during casting, causing casting interruptions.

Therefore, if you are producing steel grades requiring high purity (automotive steel sheets, pipeline steel, spring steel, bearing steel), you must use low-aluminum ferrosilicon.

"The industry standard for aluminum content in ordinary ferrosilicon75 is generally ≤1.5% or ≤2.0%, but actual deliveries often fall between 1.0% and 1.5%. Our Al 0.3 ferrosilicon reduces the aluminum content to below 0.3%. What does this '0.3%' mean? We've done a comparison:

Using ordinary ferrosilicon (Al 1.5%) for deoxidation, adding 2 kg per ton of steel introduces approximately 0.002%-0.003% alumina inclusions.

Using Al 0.3 ferrosilicon, adding the same 2 kg introduces only one-fifth of the aluminum.

For ordinary rebar, this difference is negligible. But for automotive steel and pipeline steel, a 0.001% difference in inclusions can be the difference between acceptable and unacceptable quality."

Aluminum is 0.3 ferrosilicon 75

chemical composition

Grade Model	Si ≥	Al ≤	Ca ≤	Mn ≤	Cr ≤	P ≤	S ≤	C ≤	Core Matching Steel
FeSi75 Al0.3 (Ultra Low Al)	74.0	0.3	1.0	0.4	0.3	0.035	0.02	0.1	Automotive IF steel, X80 pipeline, bearing/spring steel
FeSi75 Al0.5-A	74.0	0.5	1.0	0.4	0.3	0.035	0.02	0.1	Ordinary high-end structural steel
FeSi75 Al1.5-B	72.0	1.5	1.0	0.5	0.04	0.04	0.02	0.2	Construction rebar, general cast iron

Al0.3 vs Conventional FeSi75

Performance Index	FeSi75 Al≤0.3	FeSi75 Al1.5	Production Benefit
Molten Steel Soluble Al Residue	≤0.0032%	≥0.0063%	Avoid steel cold/hot brittleness
Al₂O₃ Inclusion Grade	Level 0.5–1.0	Level 2.0–3.0	Pass high-end steel inspection standard
Continuous Cast Nozzle Block Risk	Extremely low	Severe	Reduce unplanned shutdown frequency
Thin Plate Stamping Crack Rate	Near zero	High scrap rate	Cut finished product waste cost
Unit Raw Material Cost	Slightly higher	Low	Worth investment for high-value steel

FeSi75 Al 0.3

Products Industrial Application

Automotive IF Deep Drawing Steel (Core High-End Demand)

Al0.3 ferrosilicon eliminates subcutaneous alumina inclusions, ensure zero cracking of auto thin steel panels during stamping forming.

X60/X80 Oil & Gas Pipeline Steel

Control low Al to improve hydrogen-induced cracking resistance, extend pipeline long-distance service life.

Bearing & Spring Special Steel

Reduce hard internal inclusions, raise steel fatigue cycle life, lower bearing wear failure rate.

Electrical Transformer Silicon Steel

Ultra-low Al avoids magnetic permeability loss, stabilize soft magnetic performance of finished steel sheet.

Pidgeon Process Magnesium Smelting

Low impurity Al0.3 as high-efficiency reducing agent, improve magnesium metal recovery rate.

FAQ

Q1 What steel types must use FeSi75 Al0.3 low aluminum ferrosilicon?

A Automotive IF steel, oil pipeline X60/X80 steel, bearing/spring steel, electrical silicon steel with strict inclusion requirements; ordinary rebar can adopt Al1.5 grade to save cost.

Q2 Can your factory stably control Al below 0.3%? What's the fluctuation range?

A Each batch tested by XRF spectrometer, aluminum content fluctuation strictly controlled ±0.05%, MTC report attached with shipment; long-term supply for auto steel manufacturers without quality complaints.

Q3 What's standard addition dosage of Al0.3 FeSi in LF ladle?

A 1.4–2.8kg per ton molten steel, reduce 10% dosage vs high-Al FeSi due to higher deoxidation efficiency.

Q4 Can I get test samples & delivery schedule?

A Free 1–5kg test samples available. Standard stock goods 7–10 working days; customized Al≤0.1 special grade 15–25 working days, MOQ 25 tons full container, T/T & L/C payment supported.

Low aluminum FeSi75 Al 0.3

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