Low Aluminum Ferrosilicon FeSi75 (Al ≤0.5%) adopts secondary slag refining technology during submerged arc furnace smelting to strictly limit aluminum impurity below 0.5%, with silicon content controlled at 72%~80%.

Ordinary FeSi75 contains Al 1.0~2.0%, which generates high-melting-point Al₂O₃ clusters during molten steel deoxidation, causing nozzle clogging, pinholes and fatigue defects. Low-aluminum FerroSilicon 75 optimizes deoxidation product morphology, greatly improves molten steel cleanliness. It is the exclusive deoxidizer for high-end clean steel including bearing steel, electrical silicon steel, automotive sheet steel and high-grade ductile iron. Our factory supplies lump/granule full sizes and supports ultra-low Al≤0.2 customized grades.

Features

High hardness:

Compared with ordinary steel, Aluminum 0.5 Low Aluminum Ferrosilicon has higher hardness and can be used to manufacture parts that require wear resistance.

Good corrosion resistance:

Silicon element can react with oxides to form silicates, forming a protective film on the surface of the alloy, thereby improving the corrosion resistance of the alloy.

Good thermal stability:

It can maintain stable performance in high temperature environment, and is not prone to deformation or performance degradation.

Low al ferrosilicon 0.5 aluminum

chemical composition

Grade Name	Si (%)	Al ≤ (%)	C ≤ (%)	P ≤ (%)	S ≤ (%)	Mn ≤ (%)	Cr ≤ (%)	Core Application
Standard Low Al FeSi75	72~80	0.5	0.10	0.04	0.02	0.4	0.3	Bearing steel, automotive structural steel
Ultra Low Al FeSi75	74~80	0.2	0.05	0.03	0.02	0.3	0.2	Electrical silicon steel, ultra-low carbon IF steel
Conventional FeSi75 (Contrast)	72~80	1.5~2.0	0.20	0.04	0.02	0.5	0.5	Ordinary construction steel

0~1mm, 1~3mm, 3~8mm, 10~50mm, 10~100mm; custom mesh for cored wire filling.

Core Metallurgical Advantages vs Ordinary FeSi75

Eliminate Continuous Casting Nozzle Blockage: Al≤0.5 avoids Al₂O₃ accumulation, stable casting speed for 12+ hours;
Reduce Steel Surface Pinhole Defects: No hard alumina clusters left inside steel, improve surface finish of cold-rolled sheet;
Boost Steel Fatigue Life: Soft deformable inclusions replace hard alumina, raise impact toughness by 12~18%;
Lower Post-processing Cost: Reduce grinding & polishing allowance of finished steel castings;
Stable Silicon Recovery Rate: Balanced melting speed, less burning loss than high-Al ferrosilicon.

Industrial Application

① Electrical Silicon Steel

Aluminum seriously damages magnetic permeability of silicon steel. Low Al FeSi75% is the mandatory deoxidizer for grain-oriented & non-oriented electrical steel, reduce iron loss of transformer cores.

② Bearing Steel & Automotive Sheet Steel

Prevent tiny alumina inclusions causing bearing fatigue cracking; optimize surface quality of automotive deep drawing steel without stamping cracks.

③ Ultra-Low Carbon IF Steel

Ultra-low Al 0.2 grade avoids AlN grain boundary precipitation, eliminate slab edge cracking during hot rolling.

④ High-grade Ductile Iron Castings

Reduce carbide hard spots inside castings, improve CNC machinability of crankshaft & wheel hub castings.

⑤ Pipeline & High-strength Alloy Steel

Improve anti-hydrogen cracking performance of X70/X80 pipeline steel, extend service life under corrosive media.

Low al ferrosilicon 0.5 aluminum

FAQ

Q1: What's the core difference between low Al FeSi75 Al0.5 and ordinary FeSi75 Al1.5?
A: Low Al grade limits aluminum below 0.5%, avoids high melting Al₂O₃ inclusions, fit for electrical steel/bearing steel; ordinary high Al FeSi only for low-demand construction steel.
Q2: When to choose ultra-low Al ≤0.2 FeSi75?
A: For ultra-low carbon IF steel and high-grade electrical silicon steel with strict magnetic property requirements.
Q3: What's the recommended addition amount of low Al FeSi75 in LF refining?
A: 3~4kg per ton molten steel, add after aluminum preliminary deoxidation for best inclusion control effect.
Q4: Free samples & delivery cycle?
A: Free 1–5kg test samples available. Standard stock:7–15 working days; customized ultra-low Al grades:20–30 working days, MOQ 25 tons, T/T & L/C supported.

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