Ferrosilicon stands as a vital ferroalloy made up mainly of iron and silicon, with minimal impurities like aluminum, calcium, and carbon. Based on silicon content, the FeSi75 (silicon content 72%-78%) and FeSi72 (silicon content 70%-75%) grades are the most extensively adopted in industrial operations. This alloy boasts excellent characteristics such as a high melting point, reliable deoxidation capability, and strong alloying properties, making it an indispensable material in steelmaking, casting, and other metallurgical processes.
As a critical deoxidizer and alloying agent in the steel industry, ferrosilicon plays a key role in enhancing the quality of steel products. During the steelmaking process, it can effectively remove oxygen impurities in molten steel, thereby reducing the formation of oxide inclusions and improving the toughness, ductility, and mechanical strength of the final steel. Additionally, it can introduce silicon into steel to form wear-resistant and corrosion-resistant silicon-iron phases, which is particularly important for the production of special steel and alloy steel.
Chemical Composition Specifications of Ferrosilicon FeSi75/72
The following table details the chemical composition and impurity limits of our high-purity ferrosilicon FeSi75/72, which fully complies with international industrial standards and customer quality requirements:
| Grade | Si Content | Fe Content | Al (Max) | Ca (Max) | C (Max) | P (Max) | S (Max) |
| FeSi75 | 72.0%-78.0% | Balance | 1.5% | 0.5% | 0.2% | 0.04% | 0.02% |
| FeSi72 | 70.0%-75.0% | Balance | 1.8% | 0.6% | 0.3% | 0.05% | 0.03% |
Product Details & Supply Capacity
ZX Ferroalloy is a professional manufacturer and supplier of ferrosilicon products with years of industry experience. We specialize in providing high-purity ferrosilicon FeSi75 and FeSi72, which are available in various particle sizes and packaging forms to meet the diverse needs of customers in different industries. Our factory has advanced production equipment and a strict quality control system, ensuring that each batch of products meets the specified standards.
The following table summarizes the key product information of our ferrosilicon FeSi75/72:
| Item | Details |
| Product Name | Ferrosilicon FeSi75/72 |
| Main Components | Iron (Fe), Silicon (Si) |
| Appearance | Gray-black lumps/granules, metallic luster |
| Particle Size | 5-50mm, 10-80mm, 0-3mm (customizable) |
| Application Fields | Steelmaking deoxidation, casting inoculation, metallurgical alloying, magnesium smelting |
| Certifications | SGS, CIQ, ISO9001 |
| Minimum Order Quantity (MOQ) | 50 Tons |
| Packaging | 1MT/bag (PP woven bag with inner plastic bag), 25kg/bag, bulk (negotiable for custom packaging) |
| Monthly Supply Capacity | 5000 Metric Tons |
| Place of Origin | Shanxi, China |
Physical & Chemical Properties of Ferrosilicon FeSi75/72
Ferrosilicon FeSi75/72 exhibits excellent physical and chemical properties that adapt to various harsh industrial environments. It has a density of 6.8-7.2 g/cm³, a melting point ranging from 1200°C to 1350°C, and a boiling point of approximately 2355°C. The alloy is insoluble in water and most organic solvents, but it can react with strong acids to release hydrogen gas.
In terms of chemical stability, ferrosilicon has strong reducibility at high temperatures, which is why it is widely used as a deoxidizer in steelmaking. It can react with oxygen in molten steel quickly to form silica (SiO₂), which has a high melting point and can float on the surface of molten steel to be removed easily. Moreover, the silicon element in ferrosilicon can improve the hardenability and wear resistance of steel, making it suitable for the production of machinery parts, tools, and other products that require high strength and wear resistance.
Safety & Handling Guidelines
When storing and handling ferrosilicon FeSi75/72, it is necessary to abide by relevant safety regulations to ensure the safety of personnel and property. The specific safety information and handling guidelines are as follows:
| Item | Details |
| CAS Number | 8049-17-0 |
| EINECS Number | 232-429-1 |
| Dangerous Mark | None (non-toxic, non-flammable under normal conditions) |
| Risk Tips | Avoid dust inhalation; wear protective equipment (mask, gloves, goggles) during operation |
| Storage Requirements | Store in a dry, well-ventilated warehouse; avoid moisture and contact with strong acids |
| Transportation Guidelines | Transport as general cargo; avoid collision and breakage during transportation; prevent rain and moisture |
Main Applications of Ferrosilicon FeSi75/72
Ferrosilicon FeSi75/72 is widely used in metallurgy, casting, magnesium smelting, and other industries due to its excellent deoxidation and alloying properties. Its specific applications are as follows:
In the steelmaking industry, it is the most commonly used deoxidizer. By adding ferrosilicon to molten steel, oxygen impurities can be effectively removed, which helps to reduce the number of oxide inclusions in steel and improve the purity and mechanical properties of steel. It is also used as an alloying agent to increase the silicon content in steel, thereby enhancing the steel’s corrosion resistance, wear resistance, and high-temperature performance. This makes it suitable for the production of shipbuilding steel, boiler steel, and special alloy steel.
In the casting industry, ferrosilicon serves as an inoculant. Adding it to the casting molten iron can promote the formation of fine graphite in the cast iron, improve the microstructure of the cast iron, and enhance the toughness and strength of the casting. It is widely used in the production of gray cast iron, ductile iron, and other castings, such as engine blocks, brake discs, and pipe fittings.
In the magnesium smelting industry, ferrosilicon is used as a reducing agent. It can react with magnesium oxide at high temperatures to reduce magnesium metal, which is a key step in the production of primary magnesium. In addition, it is also used in the production of other ferroalloys, such as ferromanganese and ferrochromium, as a deoxidizer and alloying agent.
Production Process of Ferrosilicon FeSi75/72
The production of ferrosilicon FeSi75/72 mainly adopts the electric arc furnace smelting process, which uses silica (quartz stone), iron ore (or steel scrap), and coke as raw materials. The specific production steps are as follows:
First, the raw materials are crushed and screened to ensure that the particle size meets the smelting requirements. Silica (quartz stone) is the main source of silicon, iron ore (or steel scrap) provides iron, and coke serves as a reducing agent and fuel. Then, the prepared raw materials are mixed in a certain proportion and transported to the electric arc furnace.
The electric arc furnace is heated by an electric arc generated between the electrodes, and the temperature inside the furnace can reach 1800°C-2000°C. Under high-temperature conditions, coke reacts with oxygen in the air to generate carbon monoxide (CO), which reduces silica to elemental silicon. The elemental silicon then combines with iron to form ferrosilicon alloy. During the smelting process, it is necessary to strictly control the temperature, raw material ratio, and smelting time to ensure the quality and yield of the product.
After smelting, the molten ferrosilicon is poured into ingot molds for cooling and solidification. The solidified ferrosilicon ingots are then crushed, screened, and tested to obtain ferrosilicon products that meet the specifications. Finally, the qualified products are packaged and stored for delivery.