Ferrosilicon 75 Powder

75% ferrosilicon powder is a powdered material produced from high-quality 75% ferrosilicon (silicon content 72-80%) through crushing, grinding, and sieving processes. It retains the efficient deoxidation and alloying chemical properties of ferrosilicon alloys, while its powder form provides advantages such as large specific surface area, fast reaction speed, and easy uniform dispersion. It is widely used in various industrial fields including steel smelting, casting, ferroalloys, non-ferrous metals, welding materials, and mineral processing.

AON METALS' Fesi75% powder undergoes strict quality control throughout the entire process, from raw material selection to finished product testing. Customized products with different size distributions, aluminum contents, and purities are available to meet the stringent requirements of your specific processes.

Key Powder Characteristics:

Size Distribution: Narrow distributions can be customized to meet process requirements (e.g., over 90% -200 mesh), and laser size analysis reports are provided.

Flowability: Detected using a Hall effect flowmeter to ensure no clogging or bridging during automated powder feeding, spraying, or packaging.

Loose Packing Density: Affects packaging volume and filling performance in certain processes; test data is available.

Oxygen Content: For high-end applications (e.g., welding materials, reducing agents), low-oxygen grades (thin surface oxide layer) are available to enhance reactivity.

Magnetic Separation Process: All powder products undergo multiple magnetic separation processes to effectively remove mechanical iron impurities that may be introduced during crushing.

High-efficiency deoxidation ability:

During the steelmaking process, fesi 75 powder exhibits excellent deoxidation performance. Silicon has a strong affinity with oxygen and can quickly combine with oxygen in molten steel to generate silicon dioxide (SiO₂). This reaction can not only effectively reduce the oxygen content in molten steel, reduce oxide inclusions in steel, and improve the purity of steel, but also release a large amount of heat, which helps to increase the temperature of molten steel and promote the smooth progress of the steelmaking process. Generally speaking, for every ton of steel produced, about 3-5 kg ​​of ferrosilicon 75 powder is consumed for deoxidation. ​

Good alloying effect:

As an important alloying agent, 75 ferrosilicon powder can significantly improve the performance of steel. When silicon is added to steel, it can improve the strength, hardness and elasticity of steel and enhance the comprehensive mechanical properties of steel. When smelting different types of steel, such as structural steel (containing 0.40-1.75% silicon), tool steel (containing 0.30-1.8% silicon), spring steel (containing 0.40-2.8% silicon) and silicon steel for transformers (containing 2.81-4.8% silicon), fesi75 powder plays an indispensable alloying role, giving specific performance advantages to steel and meeting the diverse needs of steel performance in different industrial fields. ​

Stable chemical properties:

Ferrosilicon75 powder has good chemical stability. At room temperature and pressure, it is not easy to react chemically with oxygen and moisture in the air, and can maintain its physical and chemical properties for a long time. This makes ferrosilicon powder 75 relatively safe and convenient during storage and transportation, reduces the risk of quality loss due to deterioration, and provides a strong guarantee for its wide application in the industrial field.
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Steel smelting industry​

 Deoxidizer and alloying agent in the steelmaking process:

As mentioned above, ferrosilicon 75 powder plays a key role in the steelmaking process. It can not only efficiently deoxidize and remove harmful oxygen impurities in molten steel, but also adjust the chemical composition of steel and improve the performance of steel through alloying. In different steelmaking processes such as converter steelmaking and electric furnace steelmaking, ferrosilicon 75 powder is widely used and is an important auxiliary material for improving steel quality and production efficiency. ​

 Application in ironmaking:

In the blast furnace ironmaking process, adding an appropriate amount of ferrosilicon 75 powder can adjust the silicon content of molten iron, improve the fluidity and casting performance of molten iron, and facilitate subsequent casting processing. At the same time, silicon can also improve the strength and toughness of pig iron to a certain extent, and improve the quality of pig iron products. ​

Foundry industry​

 Inoculant and spheroidizer:

In cast iron production, ferrosilicon 75 powder is often used as an inoculant and spheroidizer. As an inoculant, it can promote the precipitation and refinement of graphite, improve the metallographic structure of cast iron, and improve the strength, toughness and processing performance of cast iron. In the production process of ductile iron, ferrosilicon 75 powder, as an important component of the spheroidizer, plays a key role in the formation and spheroidization rate of graphite balls, and directly affects the mechanical properties and performance of ductile iron. ​

 Improving the quality of castings:

The use of ferrosilicon 75 powder can effectively reduce defects such as pores and sand holes in castings, improve the surface quality and intrinsic quality of castings, reduce the scrap rate, and improve the economic benefits of casting production. ​

Other industrial fields​

 Reducing agent in ferroalloy production:

Since the silicon element in ferrosilicon 75 powder has a high affinity with oxygen, and the carbon content of high-silicon ferrosilicon is extremely low, ferrosilicon 75 powder is one of the commonly used reducing agents when producing low-carbon ferroalloys in the ferroalloy industry. It can reduce oxygen in other metal oxides at high temperatures to achieve metal refining and alloying processes.​

 Application in non-ferrous metal smelting:

In the smelting process of some non-ferrous metals such as magnesium, ferrosilicon 75 powder also plays an important role. For example, in the Pijiang process of magnesium smelting, about 1.2 tons of ferrosilicon 75 powder are consumed for every ton of magnesium produced. It participates in the high-temperature reduction reaction and replaces the magnesium in magnesium oxide, which plays an indispensable role in the production of magnesium. ​

 Application in welding rod manufacturing and mineral processing industries:

The ground ferrosilicon 75 powder can also be used in the welding rod manufacturing industry as a coating component of the welding rod coating, providing the necessary alloy elements and deoxidation functions for the welding process, and improving the welding quality. In the mineral processing industry, ferrosilicon 75 powder can be used as a suspended phase, which helps to separate and enrich minerals and improve the efficiency and precision of mineral processing.​

Q1: How does the size of 75% ferrosilicon powder affect its performance?

A1: Particle size is a key parameter affecting performance:

For steelmaking deoxidation: Particles that are too fine (e.g., <0.1mm) are easily blown away by the airflow or oxidized and burned off during addition; particles that are too coarse (e.g., >3mm) dissolve slowly and may float into the slag before reacting. A particle size of 0.5-3mm is generally recommended.

For foundry inoculation: In-flow inoculation requires fine powder (0.2-0.7mm) for rapid dissolution; slightly coarser particles (1-3mm) can be used for inoculation in the tapping trough to prolong the decay time.

For mineral processing heavy media: Ultrafine powder (-200 mesh or -325 mesh) must be used to ensure the stability of the suspension.

For welding consumables: A narrow distribution of 40-140 mesh is generally required to ensure uniform mixing in the coating.

Q2: How should 75% ferrosilicon powder be stored? Will it oxidize and become ineffective?

A2: 75% ferrosilicon powder has relatively stable chemical properties, but prolonged storage in a humid environment will cause slow oxidation on the surface, forming a thin layer of silica, which affects its reactivity. Additionally, ultrafine ferrosilicon powder may generate hydrogen gas in a confined space, posing a certain safety risk. Please be sure to:

Moisture-proof: Store in a dry, well-ventilated warehouse, keeping the packaging intact.

First-in, first-out (FIFO): Shorten storage time; it is recommended to use within 6 months.

Safety: Keep away from fire sources to prevent dust explosions.

Q3: How do you ensure the stability of the composition and size of different batches of ferrosilicon powder?

A3: Stability is our core concern. We ensure this through the following measures:

Raw material batch management: For powder products of the same batch, we use ferrosilicon blocks from the same smelting batch as raw materials whenever possible.

Process standardization: Standardized operating parameters are set for crushing, grinding, and screening equipment.

In-process sampling inspection: During production, size is sampled and tested regularly, and adjustments are made promptly.

Full inspection before shipment: Each batch of finished products undergoes re-inspection of chemical composition and size, and a material certificate and size test report are provided with the goods.

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