High Purity 75%-80% Ferrosilicon Grains
Quick Answer: High Purity Ferrosilicon Grains
We supply ferrosilicon grains in several chemical grades, including FeSi 65, FeSi 70, FeSi 72 and FeSi 75. For applications requiring tighter aluminum control, the current specification also includes a Low Al FeSi 75 option with Al 0.5% max.
The key difference between these grades is not only silicon content. C, Al, P and S limits should also be compared with your own metallurgical specification before selecting the material.
The current published composition table supports grades up to FeSi 75. If you require a higher silicon grade or another chemistry, send the complete target specification so availability can be confirmed before quotation.
You can also review our ferro silicon product range for other FeSi grades and forms.
High Purity Ferrosilicon Grains
Ferrosilicon Grain Grades and Chemical Composition
The table below shows the chemical limits currently published for the available ferrosilicon grades. Use the complete chemistry rather than Si percentage alone when comparing material for your production.
| Grade | Si ≥ | C ≤ | Al ≤ | P ≤ | S ≤ |
| FeSi 65 | 65% | 0.2% | 2.0% | 0.04% | 0.02% |
| FeSi 70 | 70% | 0.2% | 2.0% | 0.04% | 0.02% |
| FeSi 72 | 72% | 0.2% | 2.0% | 0.04% | 0.02% |
| FeSi 75 | 75% | 0.2% | 2.0% | 0.04% | 0.02% |
| Low Al FeSi 75 | 75% | 0.2% | 0.5% | 0.04% | 0.02% |
If your internal specification requires another Si level or tighter impurity limits, send the complete chemistry with your inquiry rather than selecting the material only by grade name.
FeSi 75 vs FeSi 72, 70 and 65
The main published difference between the regular grades on this page is the minimum silicon content.
| Grade | Minimum Si | Selection Focus |
| FeSi 65 | 65% | Use when a 65% silicon ferroalloy matches your process specification. |
| FeSi 70 | 70% | Intermediate silicon specification. |
| FeSi 72 | 72% | Higher Si level where your production requires this grade. |
| FeSi 75 | 75% | Higher silicon input within the published grade range. |
A higher silicon percentage does not automatically mean that it is the correct or most economical grade for your process. Select the grade from your required alloy chemistry and impurity limits.
Low Aluminum FeSi 75: Al 0.5% Max
The most distinctive specification on this page is the Low Al FeSi 75 grade.
Regular FeSi 75 in the current table allows Al up to 2.0%, while the Low Al FeSi 75 specification reduces this limit to 0.5% max.
| Specification | Regular FeSi 75 | Low Al FeSi 75 |
| Si | ≥75% | ≥75% |
| C | ≤0.2% | ≤0.2% |
| Al | ≤2.0% | ≤0.5% |
| P | ≤0.04% | ≤0.04% |
| S | ≤0.02% | ≤0.02% |
If aluminum input is important in your process, specify the maximum Al value directly in the RFQ. Do not rely only on the term "high purity ferrosilicon."
How to Select the Right Ferrosilicon Grain Grade
Start with Your Required Silicon Level
Confirm whether your process requires FeSi 65, 70, 72 or 75. The grade should match your target chemistry rather than simply using the highest available Si value.
Check Aluminum Separately
If aluminum must be tightly controlled, compare the regular specification with the Low Al FeSi 75 option. The difference between Al 2.0% max and Al 0.5% max can be more important than the product name itself.
Check Carbon, Phosphorus and Sulfur
The current grades list C 0.2% max, P 0.04% max and S 0.02% max. Compare each value separately with your internal acceptance standard.
Confirm Grain Size
The current source page identifies the product as ferrosilicon grains but does not publish a reliable grain-size range. If particle size affects feeding, dosing or handling in your process, include the required size in the inquiry before quotation.
Applications of Ferrosilicon Grains
Steel Production
Ferrosilicon is used as a silicon-bearing ferroalloy in steelmaking. When you select a grade, match the Si level and impurity limits to the chemistry required by your steel process.
Cast Iron Production
Ferrosilicon is also used in cast iron production where silicon addition is required as part of the melt chemistry.
The appropriate FeSi grade and addition quantity depend on the starting composition and target result, so the actual application should be confirmed from your own process requirements.
How to Check Ferrosilicon Grain Quality
Check the Grade Against the Purchase Specification
The first check is whether the supplied material matches the grade you ordered: FeSi 65, 70, 72, 75 or Low Al FeSi 75.
Compare Every Controlled Element
Do not accept the batch only because the Si value meets the grade.
- Si: confirm the minimum silicon value.
- C: confirm the maximum carbon value.
- Al: distinguish regular and low-Al requirements.
- P: compare with your phosphorus limit.
- S: check the sulfur limit.
Batch COA
If your purchasing procedure requires a batch COA or quality certificate, include that requirement before order confirmation.
A useful acceptance sequence is:
Your target chemistry → confirmed FeSi grade → batch quality document → receiving inspection.
Confirm the Grain Size Before Shipment
Because the current page does not state a fixed grain-size specification, define your required size or tolerance in the purchase order if particle size is important to your handling or furnace process.
Ferrosilicon Grade and Specification Discussions
Ferrosilicon Grade and Specification Discussion
What to Include in a Ferrosilicon Grain RFQ
For an accurate quotation, provide the specification that your production actually requires.
- Grade: FeSi 65 / 70 / 72 / 75 / Low Al FeSi 75.
- Si: required minimum value.
- Al: maximum acceptable limit.
- C / P / S: required impurity limits.
- Grain Size: your required particle-size range.
- Quantity: required metric tons.
- Packing: required packing method.
- Destination: destination port.
- Incoterm: FOB / CFR / CIF or another agreed term.
- Documents: COA or inspection documents required for your order.
FAQ About High Purity Ferrosilicon Grains
Request a Ferrosilicon Grain Quote
Send us the FeSi grade you need together with the required Si, C, Al, P and S limits. If you require Low Al FeSi 75, state the maximum acceptable Al value directly in the inquiry.
Please also include your required grain size, quantity, packing, destination port and quality-document requirements.
We can then confirm the available specification and prepare an order-specific quotation.
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