A method to prevent the appearance of gray cast iron white mouth 

Methods to prevent the appearance of gray cast iron white mouth are:

1. Triangular test block inspection for incubation before the furnace;

2. Check that the postponement after pouring is the time of punching the box;

3. Appropriately increase the carbon equivalent of raw molten iron (mainly silicon content) and reduce the manganese content (manganese content cannot be very low, otherwise it will affect mechanical properties);

4. In front of the furnace with 75 ferrosilicon for incubation treatment, strengthen the gestation time (ferrosilicon or external pig iron), for the castings that have been made, can only be solved by graphitization annealing (high temperature annealing for a long time, similar to the annealing of malleable cast iron);

5. Correct selection of the chemical composition of cast iron, mainly to control the content of C and Si, generally the total mass fraction of C and Si should not be less than 6%;

6. The ratio of the wall thickness of the casting to the wall thickness of the metal type is less than 1/2;

7. Metal cavity surface spray paint;

8. Adopt higher metal type preheating temperature;

9. Appropriately increase the temperature of the molten iron, and use inoculants for incubation treatment;

10. Open the mold in time, put the casting into the slow cold pit after taking it out and use the waste heat to anneal itself.

The above are some suggestions, I hope to help you!

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