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Silicon calcium
Silicon-calcium alloy is an effective deoxidizer and desulfurizer for the prod
Silicon-calcium alloy is an effective deoxidizer and desulfurizer for
the production of high-grade steel. Although silicon itself is a
powerful deoxidant, calcium is stronger. In addition, calcium and
silicon are used to control the shape, size and distribution of oxide
and sulphide inclusions, thereby improving the fluidity, processability,
ductility and impact properties of products.
Calcium has strong
affinity with oxygen, sulfur, hydrogen, nitrogen and carbon in molten
steel, so calcium silicate alloy is mainly used for deoxidation,
degassing and fixing sulfur in molten steel. The addition of calcium
silicate into molten steel produces strong exothermic effect. The change
of calcium into calcium vapor in molten steel can produce stirring
effect on molten steel, which is beneficial to the floatation of
non-metallic inclusions. Non-metallic inclusions with larger particles
and easy to float are produced after deoxidation of calcium silicate
alloy, and the shape and properties of non-metallic inclusions are also
changed. Therefore, silicon-calcium alloy is used to produce clean
steel, high quality steel with low oxygen and sulfur content, and
special performance steel with very low oxygen and sulfur content. The
addition of silicon-calcium alloy can eliminate the nodulation of steel
with aluminium as final deoxidizer in ladle nozzle and the blockage of
nozzle in tundish of continuous casting steel and ironmaking. In the
process of steel refining outside furnace, the content of oxygen and
sulfur in steel is reduced to a very low level by using calcium silicate
powder or core wire to deoxidize and desulfurize, and the sulfide form
in steel can be controlled, and the utilization rate of calcium can be
increased at the same time. In the production of cast iron, besides
deoxidation and purification, silicon-calcium alloy also plays an
inoculating role, which helps to form fine or spherical graphite, makes
the graphite in grey cast iron distribute evenly and reduces the
tendency of whiteness, and can increase silicon and desulfurization, and
improve the quality of cast iron.
Model NO | Chemical Composition(%) | ||||
Ca | Si | C | P | S | |
%Min | %Max. | ||||
Ca30Si60 | 30 | 55-60 | 1 | 0.04 | 0.05 |
Ca28Si60 | 28 | 55-60 | 1 | 0.04 | 0.05 |
Ca24Si60 | 24 | 55-60 | 1 | 0.04 | 0.04 |
Ca20Si55 | 20 | 55-60 | 1 | 0.04 | 0.04 |
Machinable granularity(Granular size): 0-3mm.0-10mm.3-8mm.10-60mm.10-70mm.10-100mm
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