Rare earth calcium-barium compound inoculant

Rare earth elements have strong deoxidation and desulfurization and degassing capabilities. A part of the high-dispersion non-metallic inclusions formed after adding molten iron provide a large number of foreign cores for the crystallization of cast iron. Therefore, within a certain content range, they can effectively Refine the austenite primary crystals and eutectic clusters, reduce the white mouth tendency, eliminate the harmful effects of lead and bismuth on the gray iron graphite morphology, improve the cross-sectional structure and improve various properties, and have good anti-recession characteristics.

The FeSi75 ferrosilicon added to the molten iron forms a large number of high-carbon and high-silicon micro-zones in the molten iron, thereby depositing a large amount of graphite particles. As the diffusion of the micro-zone disappears, the inoculation also declines. After the hot metal is combined with oxygen and sulfur in the molten metal to form a non-metallic compound, on the one hand, the elements that hinder graphitization, such as oxygen and sulfur, are removed. Good gestation effect.

In addition, the rare earth sulfide in molten iron may also be adsorbed in the high-carbon and high-silicon region to delay the dissolution of graphite into the molten iron. Therefore, the rare earth inoculant has good anti-recession properties. Among the decline properties of rare earth inoculants, rare earth inoculants Calcium-barium ferrosilicon and composite rare-earth ferrosilicon are less resistant to decline than rare-earth ferrosilicon. This is because calcium in rare-earth calcium-barium-iron ferroferric inoculants promotes carbon in the water supply and fluctuates in silicon concentration, hindering the expansion of carbon and silicon. Caused by. The composite rare earth ferrosilicon contains chromium and manganese. These elements segregate and aggregate in the liquid phase and reduce the eutectic temperature of the stable system, promote the nucleation of the eutectic cluster, and increase the number of eutectic clusters in cast iron, thereby indirectly increasing The decline ability of the compound rare earth ferrosilicon.

1. FeSi75 ferrosilicon has a good instantaneous inoculation effect, but the decline is fast. Compared with FeSi75 ferrosilicon inoculants, rare earth inoculants have better anti-incubation recession characteristics; among them, rare earth calcium barium ferrosilicon and composite rare earth ferrosilicon have better anti-decay ability than low rare earth ferrosilicon.

2. The good anti-recession properties of rare earth inoculants are related to the large amount of graphite knot cores formed in the liquid metal; in addition, barium, calcium, chromium, manganese and other elements contained in rare earth inoculants are also different To a certain extent, it directly or indirectly increases its ability to resist pregnancy and decline.

The compound rare earth calcium-barium inoculant is generally used in the casting process of low-sulfur gray cast iron, and has a significant effect on improving and passivating the shape of acute-angle graphite.

Supply granularity

0.2-1mm、1-3mm、3-8mm、8-15mm，It can process various special specifications according to user requirements.

Product packaging

25kg iron woven bag packaging plus ton bag packaging。

Quality assurance

The product name and quantity are clearly marked on the packaging bag, and the corresponding product quality guarantee is provided.