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- What is a flux?
- Removing impurities in the molten steel is very a critical factor of determining quality of steel in steelmaking process.
To remove impurities in the molten steel, in other words phosphorous, sulfur, oxygen and oxide inclusion, the raw materials or compounds which have good reactivity with the impurities are added to make a chemical compound, and this compound condenses, floats and separates to remove impurities.
Therefore, a use of proper flux to remove each impurity is essential to produce high quality of steel.
- Particles of the flux
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- Types fo flux
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Types fo flux Items Calcium-ferrite Turndish flux preparation Product name CA-FE NTF-SB LIA-15P-A LIA-15P-B SDA-25P SDA-35B,P SDA-40B Chemical
composition
(%)CaO 35~45 50~53 12~27 12~20 10~30 20~30 20~30 Al2O3 45~55 38~42 15~25 10~20 7≥ 5≥ 5≥ SiO2 5≥ 5이하 40~60 40~60 15≥ 10≥ 10≥ Fe2O3 NMT 5 NMT 1 5≥ 5≥ 2≥ 2≥ 2≥ M-Al T.C 15≥ T.C 2≥ 20≤ 30≤ 35≤ P,S NMT 0.05 Melting point (℃) 1200~1300 1320~1370 1350~1450 Apparent density
(g/cc)1.9~2.1 1.4~1.6 1.5~1.9 2.0~2.3 Particle size
( mm, % )5~30mm
95%≤1.2mm
95%≤5~30mm
95%≤2~12mm
90%≤10~40mm
90%≤10~40mm
99%≤Process used Converter Turndish ladle, Turndish Characteristics Dephosphorization
Desulphurization
Reduced working hoursAnti-oxide
Collection of inclusion
Heat insulation of molten steelinsulation
heat insulationDeoxidation
Collection of inclusion
Inhibition of oxide
