Ferrosilicon lumps of 10-100mm are the most commonly used size in steel mills. Fesi alloy of this size sinks deep into the molten steel when dropped into a ladle, avoiding being trapped and burned by the slag, resulting in high deoxidation efficiency.

How to further subdivide 10-100mm lumps?

Granularity range	Suitable for whom	Why
10-50mm	Small and medium-sized steel ladles (≤100 tons), or applications requiring rapid response	Medium-sized pieces melt quickly, resulting in even mixing of the molten steel.
50-100mm	Large steel ladles (≥100 tons), or applications with thick slag layers	Large pieces, due to their weight, can penetrate thick slag layers and sink deep into the molten steel, minimizing burn-off.

For smaller ladles and faster processing, use 10-50mm lumps; for larger ladles and thicker slag layers, use 50-100mm lumps.

ferrosilicon alloy

chemical composition

Grade	Chemical Composition(mass fraction)%
	Si	Al	Ca	Mn	Cr	P	S	C
	≥	≤
FeSi90Al1.5	87.0~95.0	1.5	1.5	0.4	0.2	0.04	0.02	0.2
FeSi90Al3.0	87.0~95.0	3	1.5	0.4	0.2	0.04	0.02	0.2
FeSi75Al0.5-A	74.0~80.0	0.5	1	0.4	I0.3	0.035	0.02	0.1
FeSi75Al0.5-B	72.0~80.0	0.5	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al1.0-A	74.0~80.0	1	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al1.0-B	72.0~80.0	1	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al1.5-A	74.0-80.0	1.5	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al1.5-B	72.0~80.0	1.5	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al2.0-A	74.0~80.0	2	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al2.0-B	72.0~80.0	2		0.5	0.5	0.04	0.02	0.2
FeSi75-A	74.0~80.0			0.4	0.3	0.035	0.02	0.1
FeSi75-B	72.0~80.0			0.5	0.5	0.04	0.02	0.2
FeSi65	65.0~72.0			0.6	0.5	0.04	0.02

Selection Recommendations:

For producing HRB400E earthquake-resistant rebar: We recommend FeSi75Al1.0-B or FeSi75-B, with moderate aluminum content to avoid nozzle clogging.

For producing cold heading steel and spring steel requiring strict titanium (Ti) control: We can provide custom-grade 75# ferrosilicon with Ti ≤ 0.03%.

For export to the EU requiring REACH compliance: Our standard export-grade FeSi75 meets RoHS requirements for Cr, P, and S content, and a test report is provided with the shipment.

How do we ensure uniform size?

Raw materials (silica, semi-coke, steel scrap) are smelted in an electric arc furnace to obtain ferrosilicon lumps with a silicon content of 72–75%. Unlike some small plants that simply crush large ingots and sieve them, our standard process is as follows:

Coarse Crushing: Jaw crushers crush large ingots to ≤150mm.

Magnetic Separation: Removes mechanical iron that may have been mixed in during crushing (reducing the iron content of the finished product by 0.2–0.5%).

Three-Stage Screening: Separates the ingots into 50–100mm and 10–50mm sizes using 50mm and 10mm mesh screens respectively. Powder smaller than 10mm is recycled and remelted.

Final Inspection: One sample is taken from every 200 tons for ICP-OES analysis of Si, Al, Ca, Mn, Cr, P, and S. Batch test reports are ensured to be included with the shipment.

ferro silicon Alloy

Products Uses

Steel industry

It is an indispensable deoxidizer and alloying agent in steel production. In the steelmaking process, adding ferrosilicon alloy can remove oxygen from molten steel, improve the quality and performance of steel, and increase the strength, hardness and wear resistance of steel. It is widely used in the production of plain carbon steel, alloy steel and special steel.

Casting industry

It is used as an inoculant and spheroidizer in the casting process. It can improve the structure and properties of cast iron, improve the quality and mechanical properties of castings, such as improving the strength, toughness and wear resistance of castings, and reduce defects and scrap rates of castings.

Other fields

It also has certain applications in non-ferrous metal smelting, chemical industry, electronics and other industries. For example, in the production of non-ferrous metals such as aluminum and magnesium, it can be used as an additive to improve the properties of metals; in the chemical industry, it can be used to manufacture chemical products such as silicides and silicates.

FAQ

Q: What's the price difference between 10-50mm and 50-100mm?

A: 50-100mm pieces are usually a little cheaper than 10-50mm pieces because they skip the crushing and screening process. If your ladle is large and you don't require very fine size, buying 50-100mm is more cost-effective.

Q: Will large ferrosilicon pieces contain powder? I'm worried about too much powder causing smoke and waste.

A: Our large pieces are all screened, and the powder rate is controlled within 3%. If you find too much powder when you receive the goods, you can tell us, and we will screen them again next time.

Q: How much is the price difference between Grade A and Grade B?

A: Grade A is more expensive than Grade B, depending on the market. For ordinary rebar and wire rod, Grade B is sufficient; for export steel, alloy steel, or steel with strict composition requirements, Grade A is more reliable.

Q: Is the size of your 10-100mm pieces consistent between batches?

A: Yes, it is. We sieve every batch of goods before they leave the factory to ensure that over 90% of the particles are within your specified range. There won't be a bunch of small pieces mixed in with large ones.

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