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Types of inoculants used in cast iron

2019-05-13

Everyone has an understanding of the inoculant , and now Xiaobian tells everyone about the types and effects of inoculants used in cast iron!

At present, there are many varieties of inoculants for the treatment of gray cast iron, but 75 ferrosilicon is widely used. In recent years, the demand for thin-walled castings is increasing, and the requirements for inoculation treatment are also more stringent. In the case of low carbon equivalent of cast iron, an inoculant containing cerium, lanthanum, cerium, zirconium or a certain rare earth element is used. Can better control the tendency of the white mouth at the thin wall. It has also been reported that the use of inoculants containing strontium, barium and rare earth elements can slow down the decline of gestation. In addition, the use of carbon inoculants has recently increased. Regarding the selection of inoculants, although a lot of research work has been carried out, it is not enough to form a universally applicable standard. The foundry needs to consider the characteristics of its own products, test with reference to the experience of other units, and assess the quality of the suppliers' products. According to the test results, the choices that suit the conditions of the company are made.

1.75 ferrosilicon

75 ferrosilicon is a commonly used inoculant. The content of aluminum and calcium has an important effect on the inoculation effect. It has been reported that ferrosilicon without aluminum and calcium has little or no effect on the gray cast iron.

2. Silicon-containing ferrosilicon

The antimony-containing ferrosilicon has a strong ability to eliminate white mouth, and is particularly advantageous for improving the shape and distribution of graphite in thin-walled castings, so that the difference in microstructure at different thicknesses is smaller, and the supercooled structure is only found on the surface layer of the casting.

3. Silicon-containing ferrosilicon

The bismuth-containing ferrosilicon also has a strong ability to promote graphitization, which can improve the morphology and distribution of graphite in thin-walled castings, and also has the effect of slowing the growth and decline, and the amount of treatment is less than 75 ferrosilicon.

4. Zirconium containing ferrosilicon

Zirconium has deoxidation effect, which is beneficial to improve the fluidity of molten iron, can reduce the white mouth tendency of cast iron, and promote uniform and fine A-type graphite. And there is also a role in slowing down the decline. China also has a supply of zirconium-silicon ferrosilicon, but there are still few adopters.

5. Silicon germanium alloy

The use of 20-30% silicon germanium alloy as an inoculant can significantly reduce the white mouth tendency of cast iron, and can increase the time of maintaining the inoculation effect to about 30 minutes, which is especially suitable for large castings. When processed, the amount of alloy added was about 0.1%.

6. Silicon calcium alloy

Although the silicon-calcium alloy has a strong inoculation effect, it is not suitable to use a granular alloy as an inoculant for cast iron, in addition to the application of the core wire.

About the inoculant Xiaobian for everyone to introduce these, want to understand and pay attention to more related information, please pay attention to our Baotou City Fangyuan Rare Earth Alloy Co., Ltd.! We are happy to serve you!

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