Strong inking inoculant, its inking ability is significantly better than 75 ferrosilicon. Compared with carbon-silicon calcium inoculant, inking ability is similar, but it has a low melting point, good solubility, low calcium content, and less slag. Allows a lower incubation temperature. Compared with ferrosilicon and barium ferrosilicon, its outstanding feature is that it does not significantly increase the number of eutectic clusters while reducing the white mouth, so it can reduce the tendency of shrinkage and improve the compactness of castings. Water pressure resistance.
The melting temperature of strontium ferrosilicon ranges from 1210 to 1310°C.
It is suitable for thin-walled or chilled high-sulfur and low-sulfur gray iron parts with strong inking ability. It can also be used for ductile cast iron to increase the number of ductiles, especially high nickel corrosion-resistant ductile iron (containing Ni 14%, Cu 6%, Cr 2%, Si 1.5%). In addition, because it reduces the white mouth and does not significantly increase the number of eutectic clusters, it is especially suitable for gray iron castings that require dense, non-porous, and water pressure resistant. The effect is good. The calcium silicate strong ink inoculant is different, which allows the molten iron temperature to be lower, and at the same time contains calcium, low aluminum content, less mold slag, and no pinhole defects in the casting.
In the ladle flushing method, the addition amount is 30% less than ferrosilicon, about 0.2-0.4% for gray cast iron, and alloy cast iron can be increased appropriately. The allowable range of inoculation temperature is 1360-1460°C, generally 1400-1460°C.
The inoculant should be added to the metal stream flowing into the ladle. Do not add the inoculant on the surface of the molten iron or put the inoculant on the ladle.
