what are the advantages of silicon barium calcium inoculant

Compared with ferrosilicon, it has a stronger ability to graphitize, increases the number of eutectic clusters, improves the uniformity of the structure and hardness of areas of different thicknesses, and slowly disintegrates. With the same amount of additives, the tensile strength of ferrosilicon increases by 20-30 N/mm2 compared to ferrosilica.

Compared with ferrosilica, the hardness of the casting varies in a smaller range when the amount of additive changes. With the same amount of additive, the difference in hardness in different sections of the step test unit is small, which contributes to the deposition of uniform and thin graphite of type A. Adding barium ferrosilicon to molten iron after spheroidization can increase the number of graphite balls, improve roundness, eliminate cementite, and disperse or reduce phosphorus eutectic. It has a very weak spheroidization effect and a weak pearlite stabilization effect. Too high barium content does not lead to a significant increase in the effect, it is better to use 4-6%. Aluminum also plays a role in deoxidation and promoting graphitization.

Too much aluminum can easily lead to the formation of pores. 1-2% is better. The 8-10% manganese in barium ferrosilicon can lower the melting point, increase the specific gravity, improve solubility, and has no obvious effect on the strength and white casting tendency of the graft casting. To reduce costs, it can also be manganese-free. The silicon content of manganese-free castings should be closer to the upper limit. The pseudospecific gravity of barium ferrosilicon is 3.0-3.3. The melting point range is 1170-1250°C. The solubility is slightly better than that of ferrosilicon. It oxidizes easily in humid air.

When silicon barium calcium is used as a deoxidizer, it is added to molten steel to increase the solubility of calcium in molten steel. Compared to other deoxidizers, the calcium content increases significantly. As can be seen, barium effectively protects calcium in molten steel and reduces calcium oxidation, thereby achieving the purpose of calcium processing in molten steel.