Ferrosilicon
Ferrosilicon is used for steel deoxidation and production of alloyed and specialty steels
Heat-resistant steels
Corrosion-resistant steels
Spring steels
Structural steels
Electrical steels
Chemical composition
Si
74-80%
Al
3.00%
P
0.04%
S
0.02%
Ca
1.00%
C
0.10%
Cr
0.30%
Mn
0.40%
Ti
0.20%
Cu
0.30%
Ni
0.30%
Mo
0.10%
V
0.50%
Si
68-74%
Al
2.00%
P
0.04%
S
0.02%
Ca
1.00%
C
0.10%
Cr
0.40%
Mn
0.40%
Ti
0.20%
Cu
0.30%
Ni
0.30%
Mo
0.10%
V
0.50%
Si
63-68%
Al
2.50%
P
0.04%
S
0.02%
Ca
1.00%
C
0.10%
Cr
0.40%
Mn
0.40%
Ti
0.20%
Cu
0.30%
Ni
0.30%
Mo
0.10%
V
0.50%
Size fraction distribution
Delivery method
- road transportation
- rail transportation
- sea freight
How ferrosilicon affects steel properties
Silicon contained in ferrosilicon increases tensile strength, yield strength, and elasticity. It also reduces impact toughness and improves steel resistance to oxidation. Silicon steel is widely used in the manufacture of leaf springs.
Ferrosilicon affects steel in the following ways:
01. Increases grain size
02. Improves hardenability
03. Stabilizes annealing temperature
04. Enhances quench hardening
05. Increases strength and hardness
06. Reduces ductility
Percentage content
0.35% Si
Most steels contain about 0.35% Si. As the silicon level increases, steel can be classified as silicon-alloyed steel.
1.30-2% Si
This silicon content increases elastic limit and yield strength. It improves the material’s ability to withstand compression and expansion. The result is structural steel.
2.5-4.2% Si and less than 1% C
The key feature of this alloy is low magnetism, which makes it suitable for manufacturing parts for dynamo machines and transformers.
Microsilica
Adding microsilica to cement and concrete mixes has a positive effect
Increased strength
Freeze-thaw resistance
Wear resistance
Chemical resistance
Chemical composition
SiO
90-92%
SiO
0.68%
Al
0.69%
CaO
0.85%
MgO
1.01%
Cr
0.61%
Mn
1.23%
C
0.98%
S
0.26%
SiO
90-92%
SiO
0.68%
Al
0.69%
CaO
0.85%
MgO
1.01%
Cr
0.61%
Mn
1.23%
C
0.98%
S
0.26%
Particle size distribution
Bulk density
- Undensified: from 130 to 350 kg/m3
- Densified: from 480 to 720 kg/m3
- Slurry: from 1,320 to 1,440 kg/m3
- Specific surface area: from 13,000 to 30,000 m2/kg
Delivery method
- container
- railcar
- road transportation
Recommended microsilica dosage is
01. Optimal – 8-10% by mass of cement
02. Maximum allowable – up to 30% + plasticizer C-3
Key performance properties
Strength
With natural aggregates, compressive strength exceeds 150 kg/cm2, and with special high-strength aggregates it can reach 300 kg/cm2.
Freeze-thaw resistance
Low permeability and higher density of the cement matrix provide excellent freeze-thaw resistance of microsilica concrete (F200-F600, up to F1000 with special additives).
Permeability
Concrete containing microsilica is significantly less permeable than concrete of equivalent strength made with ordinary Portland cement. Low permeability to water and gases (W12-W16).
Chemical resistance
Low permeability and low free lime content increase concrete resistance to chemical attack. Its potential sulfate resistance is comparable to Portland cement.
Crack resistance
Adding microsilica increases concrete crack resistance.
Reinforcement protection
Reduced alkalinity of microsilica concrete can lower its resistance to carbonation and chlorides.
Alkalinity
Microsilica lowers the pH of pore water in the cement gel.
YOUR BENEFIT!
You save up to 40% of cement without reducing concrete performance and cut thermal energy consumption during heat and moisture curing of products.