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Five common inoculants

Update time:2022-05-31 Focus on:197

There are many types of inoculants for treating cast iron on the market, but the more common ones are those containing barium, silicon, strontium, silicon-barium and rare earth alloys. Today, we have invited the staff of heritage casting to tell us about this. Three common inoculants.

The barium-containing inoculant has a strong ability to promote graphitization, which can improve the shape and distribution of graphite in thin-walled castings. Moreover, it can delay the effect of gestation and decline, and it is not necessary to add too much when dealing with it. If you add too much, it may be counterproductive.

The most common silicon-containing inoculant is 75 ferrosilicon. The content of calcium and aluminum plays an important role in the inoculation effect. It has been reported that ferrosilicon without calcium and aluminum has little effect on the inoculation of gray cast iron. Might not work either.

The strontium-containing inoculator has a relatively strong ability to eliminate white mouth, and it is more obvious that it is conducive to improving the shape and distribution of graphite in thin-walled gradually. The microstructure difference at different thicknesses is reduced, and the supercooled microstructure is only seen on the surface of the casting.

The inoculant containing silicon-barium alloy has a better ability to reduce the white mouth tendency of cast iron, and can increase the time of the inoculation effect to about 30 minutes, which is suitable for large castings, and the alloy can be added with 0.1% during processing. .

The effect of rare earth-containing inoculants is better among these types. Adding an appropriate amount of rare earth inoculants during inoculation, its effect can be several times better than 75 ferrosilicon, the effect of eliminating white mouth is obvious, and it can slow down the inoculum effect. Recession, but also pay attention to the amount added in the addition, if adding too much will cause the cast iron to be supercooled during crystallization, and there will be cementite structure.

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