Ferrosilicon 1-8 mm FeSi 70

 

We supply Ferrosilicon 70 in 1-8mm size for steelmaking, cast iron and other metallurgical alloying requirements.

The current FeSi70 specification contains 68–74% silicon, with carbon, sulfur, phosphorus, aluminum, manganese and chromium controlled separately.

The 1-8mm size gives you a smaller ferrosilicon fraction than conventional large lumps, which can be useful when your process requires more controlled batching, feeding or alloy addition.

Before you order, we recommend confirming both Chemical Composition and particle size. A correct FeSi70 grade with the wrong size distribution can still create handling or feeding problems in your process.

 

 

 

Grade	Si	C ≤	S ≤	P ≤	Al ≤	Mn ≤	Cr ≤
FeSi70	68–74%	0.10%	0.02%	0.04%	2.0%	0.4%	0.4%
FeSi70Al1	68–74%	0.10%	0.02%	0.04%	1.0%	0.3%	0.3%

Both grades use the same listed Si range of 68–74%, but the impurity limits are different.

If aluminum input matters to your steel or casting chemistry, confirm whether standard FeSi70 or the lower-Al FeSi70Al1 specification is more appropriate before quotation.

 

 

The main purchasing difference between the two listed grades is impurity control rather than silicon content.

Comparison	FeSi70	FeSi70Al1
Si	68–74%	68–74%
Al Maximum	2.0%	1.0%
Mn Maximum	0.4%	0.3%
Cr Maximum	0.4%	0.3%

If standard FeSi70 already meets your downstream specification, a lower-Al grade may not be necessary.

If your process controls aluminum, manganese or chromium more tightly, write those limits directly into the RFQ rather than ordering only by the name "FeSi70."

 

 

Particle size does not change the chemical grade, but it can change how the material behaves during storage, batching and feeding.

You may choose a 1-8mm FeSi70 specification when your process requires a smaller and more controlled ferrosilicon fraction than conventional lump material.

Before you approve the size specification, confirm:

• minimum particle size;
• maximum particle size;
• acceptable fines percentage;
• oversize tolerance;
• your actual feeding or charging method.

If fines are critical to your process, include the acceptable percentage and inspection method in the purchase specification.

 

 

Ferrosilicon is widely used in steel and cast-iron production as a silicon-bearing metallurgical addition.

FeSi 70 for Steel Deoxidation

Silicon has a strong affinity for oxygen, so ferrosilicon is commonly used in steelmaking deoxidation practice.

If you use FeSi70 for steel production, the required addition should be determined from your target silicon level, melt chemistry and total deoxidation practice.

FeSi 70 for Silicon Adjustment

FeSi70 can also provide silicon during alloy chemistry adjustment.

The actual addition rate should be calculated from the silicon content of the supplied batch and your target steel chemistry rather than from a general percentage recommendation.

FeSi 70 for Cast Iron Production

You can also evaluate FeSi70 for cast-iron and foundry processes where silicon addition is required.

If your foundry process controls Al, Mn or Cr closely, compare the FeSi70 and FeSi70Al1 impurity limits before purchasing.

 

 

 

We keep ferroalloy material available for specification matching and export supply.

Before shipment, you can confirm the required grade, particle size, quantity and batch documentation with us.

For 1-8mm material, proper packing and storage are also important because smaller particles can generate more fines during repeated handling than larger ferrosilicon lumps.

 

 

For industrial purchasing, we recommend checking the delivered batch against the agreed specification instead of relying only on the grade name.

Your inspection items can include:

• Si range;
• C, S and P limits;
• Al, Mn and Cr limits;
• 1-8mm particle-size requirement;
• batch identification;
• Batch COA requirement.

If your internal specification is tighter than the values listed on this page, send us the target limits before quotation.

 

 

 

We work with overseas industrial customers on ferroalloy specification confirmation, batch inspection, packing and export delivery.

For FeSi70 1-8mm, you can send us your required chemistry and particle-size limits before quotation so we can check the available specification first.

 

 

RFQ Item	What You Should Provide
Grade	FeSi70 or FeSi70Al1
Si	Required silicon range
Impurities	Required C, S, P, Al, Mn and Cr limits
Particle Size	1-8mm or your required size range
Quantity	Trial or bulk order volume
Application	Steelmaking, cast iron or other metallurgical use
Documents	Batch COA and other required inspection / export documents
Destination	Destination port or delivery location

 

 

Q1: What is the silicon content of FeSi70?
The current specification lists Si at 68–74%.

Q2: What is the size of this FeSi70?
The current product is specified as 1-8mm.

Q3: What is the difference between FeSi70 and FeSi70Al1?
Both use the same listed Si range of 68–74%, but FeSi70Al1 has tighter Al, Mn and Cr limits.

Q4: What is the aluminum limit for FeSi70?
The listed FeSi70 specification gives Al ≤2.0%. FeSi70Al1 lists Al ≤1.0%.

Q5: Can FeSi70 be used in steelmaking?
Yes. You can evaluate FeSi70 as a silicon-bearing addition for steelmaking and deoxidation according to your process chemistry.

Q6: Can FeSi70 be used for cast iron?
Yes. Ferrosilicon is also used in cast-iron production where controlled silicon addition is required.

Q7: Can you provide a Batch COA?
Yes. Send us the required chemistry and size limits so we can align the batch documentation with the agreed purchase specification.

Q8: What should I send for an FeSi70 quotation?
Send the required grade, Chemical Composition, 1-8mm size requirement, quantity, application, destination and document requirements.

 

 

We can confirm FeSi70 chemistry, 1-8mm particle size, packing, Batch COA and export documentation according to your agreed specification.

 

 

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