A long-term inoculant is an inoculant that has been enhanced with anti-degradation elements, such as barium and strontium, to extend its effectiveness over an extended period of time. During the casting process, the material is actually a silicon-barium inoculant. The barium element has the effect of inhibiting the breakdown of the seed and increasing the amount of ferrite. Barium ferrosilicon offers excellent anti-rot properties and is highly effective in preventing white casting. Long-term seed material (silicon-barium seed material) is a block metallurgical material produced by mixing the requisite quantities of silicon and barium powder and smelting the steel in a high-temperature furnace. It is used as an additive in the casting process at the foundry. It encourages graphitisation, reduces the likelihood of white casting, improves the morphology and distribution of graphite, increases the number of eutectic groups and enhances the structure of the matrix. The product has been shown to be effective for a short period of time following inoculation, typically between 5 and 8 minutes.
Please find below the Silicon-Barium Inoculant Composition Index:
The product contains 1-2% barium, 1-2% calcium, 70-72% silicon and 1-2% aluminium.
The composition is as follows: Ba: 4-6%, Ca: 1-2%, Si: 65-70%, Al: 1-2%.
The composition is as follows: Ba: 2%-5%, Ca: about 1.5%, Si: 68%-72%.
The standard long-term inoculant (silicon barium inoculant) is available in the following particle sizes: 0.1-0.4mm, 0.2-0.7mm, 1-3mm, and 3-6mm.
