Ferrosilicon (FeSi) is a ferroalloy produced by smelting quartzite with coal in presence of scrap iron or iron oxide in a submerged arc furnace.  Identified by the amount of silicon contained, the most common varieties of ferrosilicon produced are 50%, 65% and 75%.  FeSi can contain 1%-2% of calcium and aluminum with the balance of the product made up as iron.  Ferrosilicon is used primarily as a deoxidizer. It readily combines with the oxygen in the molten metal.  It is sometimes used as a degasifier because of its affinity for undesirable gases.  FeSi is also commonly used as a source of silicon in cast iron.  Ferrosilicon can be alloyed with additional metals in custom combinations for specialty uses in steel and iron industries. 

CC Metals and Alloys produces several following grades of specialty ferrosilicon alloys.

 

50% FeSi specs

 

%Si

%Al

%Ca

%Other

 

 

 

 

 

Regular Grade

47-51

1.25 Max

0.30 Max

-

         

Low Al

47-51

0.50 Max

0.20 Max

-

         

High Purity

47-51

0.10 Max

0.10 Max

0.03 Max Ti

         
         

75% FeSi specs

 

%Si

%Al

%Ca

%Other

 

 

 

 

 

Regular Grade

74-79

1.50 Max

0.50 Max

-

         

Regular Low Al

74-79

0.50 Max

0.30 Max

-

         

Low Al

74-79

0.10 Max

0.30 Max

-

         

Low C

74-79

-

-

0.02 Max C

         

High Purity

74-79

0.10 Max

0.10 Max

0.04 Max Ti

       

0.03 Max C

 

 

50% FeSi specs

 

Mesh

%Si

%C

%S

%P

           

Stabilized

40 x 325

47 Min

0.12 Max

0.02 Max

0.04 Max

           

Unstabilized

40 x 325

47 Min

0.12 Max

0.02 Max

0.04 Max

Ferrosilicon 50% Grade is used in fluxes for both welding electrodes and core wire.

 

 

Silica Fume specs

   

Ferrosilicon Dross specs

 

%SiO2

   

 

%Si

 

 

       

Ferrosilicon

85 Min

   

Ferrosilicon Dross

38-42

Silica fume is used to produce high quality concrete with increased strength and durability. It is also used by refractory and the prefab chimney industries.