Ferrosilicon 72

Zhen an Metallurgy

Ferrosilicon 72

The silicon content of ferrosilicon 72 is as high as 72-75%, which is the variety with higher silicon content among ferrosilicon products. High silicon content means that more silicon elements can be provided per unit dosage, which improves the use efficiency.

The content of some elements can be customized

Stable Quality Uniform Shape

Packaging: 1 Ton Jumbo Bag

High Silicon Content 40-75%

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What is Ferro Silicon 72?

Ferrosilicon 72 is an important ferroalloy material, mainly composed of silicon and iron, with a silicon content of about 72-75%. As a commonly used deoxidizer and alloying element in the steel smelting process, ferrosilicon 72 plays a key role in the metallurgical industry. It can not only effectively remove oxygen from molten steel and improve the quality of steel, but also significantly improve the mechanical properties of steel.

Chemical Composition of Ferro Silicon 72

  • Si: 72-75%
  • Fe: 22-25%
  • Al: ≤1.5%
  • C: ≤0.1%
  • P: ≤0.04%
  • S: ≤0.02%
  • Ca: ≤0.5%
  • Ti: ≤0.1%

Specifications of ferrosilicon 72

Chemical composition(%)

Particle size:

  • 10-50mm (common specification)
  • 10-100mm
  • 3-10mm (small particles)
  • 0-3mm (fine powder)

Packing method:

  • 1 ton bag (for large and medium-sized users)
  • 25kg woven bag (for small batch users)
  • Bulk (for bulk purchases)

Appearance: silver-gray metal block, granular or powder
Physical properties:

  • Density: about 3.0-3.2 g/cm³
  • Melting point: about 1200-1300℃
  • Hardness: Mohs hardness about 6-7

Performance characteristics of ferrosilicon 72

  1. High silicon content: The silicon content is between 72-75%, which is the variety with higher silicon content in the ferrosilicon series. This makes it have stronger deoxidation ability and alloying effect.
  2. Strong deoxidation ability: Due to the strong reducing property of silicon, ferrosilicon 72 can effectively remove oxygen from molten steel and significantly improve the quality of steel. In molten steel, silicon reacts with oxygen to form SiO2, thereby reducing the oxygen content in steel.
  3. Excellent alloying effect: Adding ferrosilicon 72 can significantly improve the strength, hardness and wear resistance of steel. Silicon can strengthen ferrite and improve the yield strength and tensile strength of steel.
  4. Low melting point: The melting point of ferrosilicon 72 is about 1200-1300℃, which is lower than the melting point of pure iron (1538℃), which is conducive to rapid dissolution during the smelting process and improves production efficiency.
  5. Moderate density: The density is about 3.0-3.2 g/cm³, which is conducive to uniform distribution in molten steel and ensures the consistency of alloying effect.
  6. Good conductivity: Ferrosilicon 72 has good conductivity and can be used as a conductive material in some special applications.
  7. Chemical stability: It is stable to air and water at room temperature, not easy to oxidize, and easy to store and transport.

Industrial applications of ferrosilicon 72

Ferrosilicon 72 is used in steelmaking:

Ferrosilicon is used as a deoxidizer and alloying agent in the steel industry. In order to obtain qualified chemical composition and ensure the quality of steel, deoxidation must be carried out in the final stage of steelmaking. The chemical affinity between silicon and oxygen is very large, so ferrosilicon is a strong deoxidizer for steelmaking sedimentation deoxidation and diffusion deoxidation. Adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of steel.

Ferrosilicon 72 is used in cast iron industry:

Used as an inoculant and spheroidizer in the cast iron industry. Cast iron is an important metal material in modern industry. It is much cheaper than steel, easy to melt and refine, has excellent casting properties, and its seismic resistance is much better than steel. In particular, ductile iron has mechanical properties that reach or approach those of steel. Adding a certain amount of silicon to cast iron can prevent the formation of iron powder, promote the precipitation of graphite and the spheroidization of carbides. Therefore, in ductile iron production, ferrosilicon is an important inoculant (which helps the precipitation of graphite) and spheroidizer.

What is the Ferro Silicon 72 Production process?

The production of ferrosilicon 72 mainly adopts electric furnace smelting method, and the specific steps are as follows:

  • Raw material preparation: The main raw materials include quartz stone (silica), coke, steel scraps, etc. The raw materials need to be screened, cleaned and crushed.
  • Batching: Mix the raw materials evenly according to a certain proportion.
  • Electric furnace smelting: Reduction reaction is carried out in a high-temperature arc furnace, and the temperature can reach above 2000℃.
  • Out of the furnace: After smelting, the molten ferrosilicon is poured into the mold.
  • Cooling: Natural cooling or water cooling.
  • Crushing and grading: The cooled ferrosilicon blocks are crushed and graded according to different particle sizes.
  • Packaging: Packaging according to customer needs.

The entire production process requires strict control of temperature, raw material ratio and reaction time to ensure the stability of product quality.

Quality Standards

The production and quality control of ferrosilicon 72 usually follow international standards or relevant standards of various countries, mainly including:

  • ISO 5445:1980 Ferrosilicon — Specification and conditions of delivery
  • ASTM A100-07(2018) Standard Specification for Ferrosilicon
  • GB/T 2272-2009 Ferroalloys Ferrosilicon (Chinese National Standard)
  • DIN 17562 Ferrosilicon (German Standard)

These standards specify the chemical composition, particle size, impurity content and other technical requirements of ferrosilicon 72, as well as sampling, inspection methods and packaging labels.

Quality Standards

It should be stored in a dry and ventilated environment to avoid moisture. Moisture may cause the product to agglomerate or affect the use effect.


Although ferrosilicon 72 is a non-hazardous product, it should be protected from moisture and collision during transportation to avoid product breakage or pulverization.


  • When adding during the smelting process, the amount and speed of addition should be controlled to ensure uniform distribution.
  • Preheat before adding to reduce heat loss and splashing.
  • Depending on the application scenario, the amount and timing of addition may need to be adjusted.


  • Dust may have explosion risks, and ventilation and dust prevention measures should be taken during use.
  • Appropriate personal protective equipment should be worn during operation, such as dust masks, goggles, etc.
  • Contact with water may produce flammable gases, and contact with water or acid should be avoided.
  • Environmental protection: During the production process, attention should be paid to controlling dust and exhaust gas emissions and complying with relevant environmental protection regulations.

In short, ferrosilicon 72, as an important metallurgical auxiliary material, plays an irreplaceable role in steel production and other industrial fields. Its high silicon content and excellent performance characteristics make it a key raw material in the production process of many high-quality steels. With the continuous advancement of industrial technology and the development of new application areas, the importance of ferrosilicon 72 will continue to increase, promoting the development of the metallurgical industry and related industries.

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