FeSi 75% FerroSilicon Standard

Ferrosilicon 75 is a ferroalloy widely used in the industrial field. Ferrosilicon 75 usually refers to ferrosilicon alloys with a silicon content of 72%-75%. According to national standards, there are many specific grades such as FeSi75Al0.5-A and FeSi75Al0.5-B. High-quality natural blumps of ferrosilicon 75 are generally dark gray, with a bright and uniform metallic luster. The surface should be smooth without cracks and oxidation. The shape is usually irregular, with forms such as powder, particles, blumps and natural blumps. Powders have different mesh sizes, such as 40 mesh and 50 mesh; blumps have regular shapes, and the length, width and height are relatively consistent; natural blumps are generally more than 100mm.

Steelmaking industry:

It is an extremely important deoxidizer that can efficiently remove oxygen from molten steel, improve the purity and quality of steel, and is used for precipitation deoxidation and diffusion deoxidation. It is also a commonly used alloying element additive that can improve the strength, hardness, elasticity of steel, improve the magnetic permeability of steel, and reduce the hysteresis loss of transformer steel.

Cast iron industry:

It is an important inoculant and spheroidizer in the production of ductile iron. It can prevent the formation of carbides in iron, promote the precipitation and spheroidization of graphite, improve the performance of cast iron, and increase its strength and toughness.

Ferroalloy production:

Due to the high chemical affinity of silicon with oxygen and low carbon content, it is a commonly used reducing agent in the production of low-carbon ferroalloys.

Other fields:

In the Pidgeon process of magnesium smelting, it is often used in the high-temperature smelting process of magnesium metal to replace magnesium in CaO・MgO. Ground or atomized ferrosilicon powder can be used as a suspension phase in the mineral processing industry, as a coating for welding rods in the welding rod manufacturing industry, and high-silicon ferrosilicon can be used in the chemical industry to manufacture silicone and other products.

Brand	FerroSilicon 75	FerroSilicon 72
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Chemical composition	Usually the silicon content is between 74%-80%. Taking FeSiAl1.5-A as an example, the composition also includes Al≥1.5%, Ca≤0.06%, Mg≤0.05%, Mn≤0.25%, P≤0.04%, Al+Si≤1.7%, Ti≤0.10%.	The silicon content is between 72%-80%. The general composition indicators are carbon content≤0.08%, phosphorus content≤0.05%, copper content≤0.10%, titanium content≤0.10%, manganese content≤0.20%, iron content≤1.00%, and impurity content≤1.00%.
Hardness	Ferrosilicon 75 is generally called hard ferrosilicon, which is relatively hard;	Ferrosilicon 72 is soft ferrosilicon, which is harder at room temperature but slightly softer than ferrosilicon 75.
Appearance	Natural block of high-quality ferrosilicon 75 is dark gray with bright and uniform metallic luster;	ferrosilicon 72 may be relatively weak in appearance in terms of glossiness, but the overall difference is not great.
Uses	75: Due to its high silicon content, it is mainly used in the production of special steels, such as stainless steel and heat-resistant steel, to improve the strength and corrosion resistance of steel. It is also more advantageous as a reducing agent in ferroalloy production and can better reduce other metal elements.	Due to its high cost-effectiveness, it is widely used in the production of ordinary steel, used to improve the processing performance and mechanical properties of steel, and is also commonly used as an inoculant in the foundry industry.
Price	Generally speaking, the price of ferrosilicon 75 is slightly higher than that of ferrosilicon 72. Because of its higher silicon content, the cost of raw materials and process control required in the production process is relatively high.

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