Ferro Silicon Magnesium Uses

 

Enhanced Deoxidation

• Silicon is a strong deoxidizing element, while magnesium has a deoxidizing capacity far exceeding that of silicon and iron. When combined, they achieve "synergistic deoxidation."
• During steelmaking, silicon reacts preferentially with oxygen in the steel to form SiO₂, while magnesium further reacts with residual oxygen or low-melting-point oxides (such as FeO) to form high-melting-point MgO.
• The oxides of magnesium and silicon can form composite inclusions with finer particles and more uniform distribution, reducing the damage to the mechanical properties of steel caused by large oxide inclusions.
• This is particularly suitable for steel grades with high purity requirements, reducing the risk of fatigue failure caused by oxide inclusions.

 

Highly efficient desulfurization

Sulfur is a harmful element in steel. Magnesium and silicon in ferrosilicon magnesium alloys can desulfurize in the following ways

• Magnesium has a strong affinity for sulfur and can react preferentially with sulfur in steel to form MgS, which has a low density and can easily float to the top of the steel slag and be removed.
• Silicon can assist in desulfurization, mainly by indirectly promoting the desulfurization reaction of magnesium through reducing the oxygen content in steel.
• For high-sulfur steel, the desulfurization efficiency of ferrosilicon magnesium alloy can reach 50%-70%, significantly reducing the sulfur content in steel and improving the hot workability and weldability of steel.

 

Fine-tuning the composition and structure of steel

• Supplementing silicon: Silicon in ferrosilicon magnesium alloys can be used as a source of silicon to improve the strength and hardness of steel, while enhancing its oxidation resistance and corrosion resistance.
• Inhibiting harmful phase precipitation: As a trace element, magnesium can refine the grain size of steel and reduce the accumulation of carbides and sulfides at grain boundaries, thereby improving the low-temperature toughness of steel.
• Microstructural control in special steel grades: In certain low-alloy high-strength steels, magnesium can react with nitrogen to form stable Mg₃N₂, reducing the "ageing embrittlement" effect of nitrogen on steel while promoting the formation of strong and tough microstructures such as bainite and martensite.