75% ferrosilicon refers to ferrosilicon with a silicon content between 72% and 80%. Why 75? Because it's a commonly used midpoint in the industry for easy memorization. In chemical composition tables, it's classified as Grade A or Grade B. What's the difference?

Grade A: Impurities are more strictly controlled, especially aluminum, phosphorus, and sulfur. It's mainly sold to customers producing high-end and specialty steels, such as factories producing automotive steel sheets and pipeline steel, which have high purity requirements.

Grade B: Impurities are relatively less strictly controlled, but it offers better value for money. It's sold to customers producing ordinary steel, castings, or for steel deoxidation; it's sufficient and saves money.

75% ferrosilicon is the most commonly used basic alloy in the steel and casting industries. Simply put, it mainly does three things:

As a deoxidizer in steelmaking: It removes oxygen from molten steel, turning it into slag which is then discharged, making the steel "cleaner."

As an alloying element: It adds silicon to steel to increase its strength and hardness.

During casting, it is used as an inoculant: added to molten iron, it helps the graphite grow finer and more uniformly, thus improving the quality of the casting.

75 FerroSilicon

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
FeSi90Al3.0	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

For deoxidation of plain carbon steel and general castings: Grade B is sufficient, such as FeSi75-B; it's affordable and effective.

For alloy steel, export steel, and products sensitive to impurities: Grade A is recommended, such as FeSi75-A or FeSi75Al1.0-A; these have fewer impurities and consistent quality.

For those particularly concerned about aluminum content: We offer FeSi75Al0.5-A with Al ≤ 0.5%, exclusively for high-end customers.