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Silicon calcium barium inoculant is mainly used in:
Deoxygenation treatment
After adding carbon enhancer during steel discharge, the dosage is 0.5-1.5kg/ton of steel. For example, when smelting low carbon steel in converter, the calcium content of liquid steel can reach 0.003-0.005% after adding silicon calcium barium, which is significantly better than traditional silicon calcium alloys.
Continuous casting and protective casting
Add 0.1-0.3% silicon calcium barium with the flow can improve the fluidity of the steel and reduce water mouth nodules. When a steel mill was producing pipeline steel, after using silicon calcium barium treatment, the surface defect rate of continuous casting billets dropped from 3.2% to 0.8%.
Production of special steel grades
In large-section ductile iron (such as QT580-15A), silicon calcium barium is used as a primary incubator, combined with bismuth-containing incubator, the tensile strength of the casting is ≥580MPa and the elongation rate is ≥15%3. In stainless steel smelting, calcium-silicon barium can replace part of aluminum deoxygenation, reducing costs while avoiding aluminum nitride precipitation.
Compared with traditional incubators, calcium silicon barium has three core advantages:
Strong anti-recession ability
The duration of its fertilization effect is twice that of 75 ferrosilicon, and it can still maintain stable performance when the temperature of the molten iron fluctuates (±50℃).
Low addition amount
Under the same effect, the amount of calcium and barium silicon is only 1/2-1/3 of ferrosilicon, which can reduce the cost of steelmaking by 10-15%.
Wide adaptability
It is suitable for the entire series of steel types from gray cast iron to high alloy steel, especially in thin-walled parts (wall thickness < 5mm) and thick large castings (wall thickness > 100mm).
