(1) ferrosilicon inoculant. Ferrosilicon inoculants are divided into 3 types, 45FeSi, 75FeSi and 85FeSi. 45FeSi inoculant has poor treatment efficiency, 85FeSi cost is high, and 75FeSi is often used. Ca and Al in 75FeSi had a great influence on the inoculation effect. Ca had a great influence on the inoculation effect and had a strong inking ability when the content of Ca was more than 0.5%. General 75FeSi chooses the following chemical composition range, Si: 74% ~ 78%; Ca:0. 5% ~ 1%; Al: 0.8% ~ 1.5%.
(2) silicon barium inoculant. Silicon barium inoculant is mainly used for gray iron and ductile iron production. It can significantly increase the number of graphite balls for nodular cast iron, and it can reduce chilling tendency for gray cast iron. Refining grain and improving graphite morphology. This kind of inoculant not only can obtain higher mechanical properties, but also has stronger anti-decay ability. Ba in general inoculant is between 2% and 3%.
(3) Si - C inoculant. Such inoculants are mainly based on ink inoculants, and their main advantages are dosage.
Less ink, but harder to dissolve. For example, Si-C-Ca-Al has good whitening prevention effect and is suitable for cupola molten iron. Si-C-Al has better softening effect and is used to improve cutting performance.
(4) rare earth inoculants. Rare earth element is an important component of high-efficiency and long-acting inoculant for cast iron. There are abundant rare earth resources in China. It is more realistic to study and apply this kind of inoculant. Generally speaking, this kind of inoculant has dual nature, and the rare earth residue in inoculated cast iron has a certain range (RE 0.3%-0.06%).
When the carbon equivalent is low, the addition of rare earth is small, and when the carbon equivalent is high, the addition of rare earth is slightly more. In addition, rare earth elements are also combined with Mn, Cu and other alloy elements, thus improving the structure of cast iron and improving the mechanical strength.
(5) silicon calcium inoculant. Silicon calcium inoculant is an early use of inoculant, and now it often uses low calcium inoculant. It is more suitable for low carbon equivalent cast iron production, which can eliminate white and enhance strength.
(6) stabilisation of inoculants. The stabilizing inoculant is composed of ink and stabilisation elements.
It can effectively promote graphitization and restrain the decomposition of cementite. It is suitable for the production of high carbon equivalent cast iron. Rare earth stabilized inoculant and nitrogen stabilized inoculant are common.
(7) compound inoculant. Compound inoculant is a kind of inoculant which is composed of graphitizing elements and elements hindering the growth of eutectic group. It plays an inoculant role in nucleation and growth. Therefore, more and more attention has been paid to the production of cast iron.