Determination of the amount of inoculant added

2021-10-14

Basically, in the cast iron industry, before pouring the molten iron, a certain amount of inoculant must be added to the molten iron to change the solidification process of the molten iron and improve the as-cast structure. This is to improve the performance of the casting and make the casting more perfect. So someone asked how to add an inoculant during this process? Let's discuss it with everyone below.

1. Nodular cast iron usually contains more inoculants than gray cast iron.

2. If the pouring time of molten iron after inoculation treatment is longer, the addition amount should be increased due to the decrease of inoculation amount.

3. Thin-walled castings are easy to produce residue, so the amount of inoculant should be increased accordingly.

4. When there is a large amount of molten slag in the molten iron, once the inoculant comes into contact with the slag, it will be wrapped up and difficult to melt, so the added amount should be increased accordingly.

5. Excessive addition of inoculant will cause excessive slag inclusion, lower molten iron temperature and shrinkage of eutectic cluster. If the size of the inoculant is too large, the molten iron cannot be uniformly inoculated, and the undissolved inoculant will be poured into the cavity. If the particle size is too small, it is easy to be oxidized to produce slag, and it will also cause a decrease in incubation.

6. The amount of inoculant used in the flow-through inoculation method is small, generally 0.2~0.8mm, and the addition amount is 0.05%~0.2%; the block size of the intracavity inoculation method generally requires ≤0.25mm, and the addition amount is ≤0.1%. The block size added by other inoculation methods is generally 1-3mm or 3-8mm, and the added amount is 0.1% to 0.8%.

What I want to remind everyone here is that different manufacturers, different furnace types, and different inoculants have different dosages. For specific problems, the dosage of inoculants should be adjusted according to the analysis of the situation.

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