Ferrosilicon 75 (FeSi 75) is an alloy containing about 75% silicon, commonly used in the metallurgical industry, especially in steel production. Its main components are silicon (Si) and iron (Fe), and may contain small amounts of other elements such as aluminum (Al), calcium (Ca), etc. to a certain extent. Depending on the purity of the alloy and the manufacturing process, the silicon content and iron content of ferrosilicon alloys vary, but the silicon content of ferrosilicon 75 is generally about 75%.

Ferrosilicon is an alloy with high conductivity and oxidation resistance, so it has good high temperature resistance. It has a certain degree of magnetism. Ferrosilicon is a reducing agent and can be used as a deoxidizer in the steel production process. It has strong reducing properties and can reduce iron oxide in iron ore to iron at high temperatures.

Ferrosilicon 75 (FeSi 75)

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
FeSi9oAl3.0	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

Ferrosilicon 75 is mainly used in the following fields

Steel Industry Deoxidizer:

In the steelmaking process, ferrosilicon 75 is an indispensable deoxidizer. The oxygen in the molten steel will seriously affect the quality of the steel, causing defects such as pores and looseness. The silicon in ferrosilicon 75 has a strong affinity with oxygen and can react quickly to generate silicon dioxide (SiO2), which is discharged in the form of slag, thereby effectively reducing the oxygen content in the steel and improving the purity and quality of the steel. For example, in the later stage of converter steelmaking, adding an appropriate amount of ferrosilicon 75 can reduce the oxygen content in the steel to an appropriate level and avoid quality problems during subsequent processing and use of the steel.

Steel Industry Alloying:

As an alloying agent, Ferrosilicon 75 can significantly improve the properties of steel. Silicon element can be solid dissolved in ferrite, resulting in solid solution strengthening and improving the strength, hardness and elastic limit of steel. Ferrosilicon 75 is an important alloy additive material when producing special steel types such as spring steel and heat-resistant steel. For example, in 60Si2Mn spring steel, the addition of silicon enhances the elasticity and fatigue resistance of the spring, making it resistant to deformation under repeated stress. It is widely used in suspension systems of automobiles, motorcycles, etc.

Foundry industry Inoculants:

Ferrosilicon 75 is a commonly used and effective inoculant in cast iron production. It can promote the graphitization process and prevent the formation of white tissue. By adding ferrosilicon 75 to the molten iron, the nucleation core of graphite is increased, making the graphite morphology in cast iron more uniform and finer, thus improving the mechanical properties of cast iron, such as increasing strength, toughness and ductility. In the production process of ductile iron, ferrosilicon 75 is used in conjunction with spheroidizing agents to significantly improve the spheroidizing effect and produce high-quality ductile iron castings. These ductile iron castings are widely used in automobile manufacturing, machinery manufacturing and other fields to manufacture engine parts, crankshafts, gears and other key components.

Nonferrous metal industry Aluminum alloy additives:

In aluminum alloy production, ferrosilicon 75 can be used to adjust the composition of aluminum alloys and improve their casting properties. Silicon element can lower the melting point of aluminum alloy and improve its fluidity, making it easier for aluminum alloy to fill the mold during the casting process and reducing the occurrence of casting defects. At the same time, silicon can also improve the strength and hardness of aluminum alloys. For example, in 6061 aluminum alloy, the addition of ferrosilicon 75 improves its overall performance, making it widely used in manufacturing fields such as building doors and windows, and automobile parts. By rationally adding ferrosilicon 75, the 6061 aluminum alloy not only ensures good processing performance, but also has high strength and corrosion resistance, meeting the needs of different application scenarios.

Chemical industry:

In the chemical industry, ferrosilicon 75 can be used to prepare certain silicon compounds. For example, in the production of silane, silicone oil, silicone rubber and other products, ferrosilicon 75 participates in chemical reactions as a silicon source. These silicon compounds are widely used in the chemical industry. Silanes are often used in chemical vapor deposition in the semiconductor industry to prepare high-quality semiconductor films. Silicone oil has good lubricity, temperature resistance and electrical insulation, and is widely used in cosmetics. , lubricants, electrical insulation materials and other fields; silicone rubber is used to manufacture seals, rubber products, etc. due to its excellent heat resistance, cold resistance and aging resistance.

Powder metallurgy industry:

In powder metallurgy production, ferrosilicon 75 powder can be used as an additive to improve the properties of powder metallurgy materials. It can improve the strength, hardness and wear resistance of the material, and at the same time affect the sintering performance of the material, making the sintering process smoother and improving the quality and performance of the product. For example, when manufacturing some high-performance mechanical parts, cutting tools and other powder metallurgy products, adding an appropriate amount of ferrosilicon 75 powder can optimize the performance of the product and meet the material performance requirements of different industrial fields.