Ferrosilicon for Metallurgical Use | FeSi72 & FeSi75

 

Ferrosilicon for metallurgical use is mainly selected according to silicon content, impurity limits, particle size and the way the alloy will be added into the metallurgical process. We supply FeSi72 and FeSi75 in lump sizes including 10-50mm and 50-100mm for steelmaking and foundry applications.

FeSi72 and FeSi75 are not selected only by comparing 72% and 75% silicon. You should also confirm the acceptable Al, P, S and C limits and choose a particle size that matches your charging or handling method.

More grades and particle-size options are available in our ferrosilicon product range .

 

The following FeSi72 and FeSi75 values are the reference specifications used on this product page. For an actual purchase, the required grade, impurity limits and particle-size range should be confirmed together before production and shipment.

Specification	FeSi72	FeSi75
Si	≥72%	≥75%
Al	≤2.0%	≤2.0%
P	≤0.04%	≤0.04%
S	≤0.02%	≤0.02%
C	≤0.20%	≤0.20%
Particle Size	10-50mm / 50-100mm	10-50mm / 50-100mm

If your specification requires tighter impurity limits or another particle-size range, send those values with the inquiry instead of selecting only from the reference table.

 

The main difference between FeSi72 and FeSi75 is the minimum silicon content. FeSi75 contains at least 75% Si, while FeSi72 contains at least 72% Si. This changes how much ferro silicon is required to introduce a given amount of silicon into the melt.

When to Select FeSi72 for Metallurgical Use

FeSi72 is suitable when your plant specification is based on a 72-grade ferro silicon or when its silicon level and impurity limits already match the required metallurgical process.

For detailed chemistry and batch confirmation, you can also review our FeSi72 specification .

When to Select FeSi75 for Metallurgical Use

FeSi75 provides a higher silicon concentration per unit weight. It is commonly selected when the process specification specifically requires a minimum 75% silicon grade or when a higher silicon input is preferred.

If your process requires smaller material, our FeSi75 3-10mm page covers a more specific particle-size option.

 

In steelmaking, ferro silicon can provide silicon while participating in deoxidation and composition adjustment. The required FeSi grade should therefore be selected from the target silicon input and the chemistry limits already used by your steel plant.

Ferrosilicon for Steel Deoxidation and Silicon Adjustment

Silicon has a strong affinity for oxygen, which is why ferro silicon is widely used in steelmaking. At the same time, the silicon introduced by the alloy contributes to final composition adjustment. For this reason, the addition should be calculated from the actual FeSi grade rather than treating FeSi72 and FeSi75 as interchangeable.

Metallurgical FeSi Batch Chemistry Should Match the Steel Grade

If Al, P, S or C input is restricted in your steel grade, include those limits in the purchase specification. The applicable batch chemistry can then be checked against the same limits before use.

 

In foundry production, ferro silicon can be used when the process requires silicon adjustment in cast iron. Grade selection should be based on the starting chemistry, required final silicon level and the addition practice used by the foundry.

Ferrosilicon for Cast Iron Silicon Adjustment

When silicon adjustment is the main purpose, FeSi72 or FeSi75 can be selected according to the amount of silicon that must be introduced. The actual addition also depends on melt weight, starting chemistry and the recovery achieved in your own process.

Standard Ferrosilicon vs Foundry Inoculant

A standard FeSi72 or FeSi75 alloy should not automatically be treated as a dedicated inoculant. If inoculation is your main application, the required chemistry, particle size and addition practice should be confirmed separately.

 

Chemical grade and particle size solve two different purchasing questions. FeSi72 or FeSi75 defines the chemistry, while the lump range determines whether the material fits your handling and charging system.

Ferrosilicon 10-50mm for Metallurgical Use

The 10-50mm range keeps the upper lump size relatively small and can be selected when the feeding system or material-transfer route is not suitable for coarse 50-100mm pieces.

Ferrosilicon 50-100mm for Metallurgical Use

The 50-100mm range is a coarser lump option. Before selecting it, confirm that the storage, weighing, conveying and charging equipment can handle larger ferro silicon pieces.

For more detail, see our ferrosilicon particle size for steelmaking guide.

 

Silicon content is usually the first value used to distinguish FeSi72 from FeSi75, but impurity limits should not be ignored when the final steel or cast iron chemistry is controlled tightly.

Aluminum in Metallurgical Ferrosilicon

The current reference specification uses Al ≤2.0% for both FeSi72 and FeSi75. If your process requires a lower maximum aluminum content, the tighter value should be written into the inquiry and order specification.

P, S and C Limits in Metallurgical Ferrosilicon

The reference limits on this page are P ≤0.04%, S ≤0.02% and C ≤0.20%. If your plant specification is tighter, use your required limits as the acceptance basis instead of relying only on the general product grade.

 

Before a metallurgical ferro silicon order is confirmed, the grade, particle size and controlled impurity limits should be written clearly into the purchase requirement. The applicable batch COA can then be checked against the same chemistry limits.

For repeat purchasing, keeping the same specification from quotation through batch inspection is more useful than comparing several different supplier tables after the material has already been produced.

 

 

 

 

When requesting a quotation, tell us whether the material is for steelmaking or foundry use and provide the FeSi grade, chemistry limits and particle size required by your process.

Send Ferrosilicon Requirement

 

What Grades of Ferrosilicon Are Available for Metallurgical Use?

This product page covers FeSi72 and FeSi75. FeSi72 has Si ≥72%, while FeSi75 has Si ≥75%. Select the grade according to the silicon input and impurity limits required by your metallurgical process.

Is FeSi72 or FeSi75 Better for Steelmaking?

Neither grade is automatically better for every steel plant. FeSi75 provides more silicon per unit weight, while FeSi72 may already match an approved plant specification. The correct choice depends on target chemistry and addition practice.

What Ferrosilicon Particle Sizes Are Available for Metallurgical Use?

The reference product sizes on this page are 10-50mm and 50-100mm. Select the range according to your storage, feeding and charging equipment, and define fines or oversize limits separately when required.

Can Ferrosilicon for Metallurgy Be Used in Foundry Production?

Yes, ferro silicon can be used for silicon adjustment in cast iron. If the intended function is inoculation rather than general silicon adjustment, confirm the required alloy chemistry and particle size separately.

What Should Be Confirmed Before Ordering Metallurgical Ferrosilicon?

Confirm the application, FeSi72 or FeSi75 grade, Si and impurity limits, particle size, COA requirement, packing, quantity and destination. These details provide a clearer purchasing basis than ordering only by the term "metallurgical ferrosilicon."

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