I am the youngest girl in the factory.
Today, I will take you to continue to understand
the metallographic adverse reactions of ductile iron
six, surface reaction layer: mainly because of molding sand,
coated sand containing N, S, O amount is too high.
The content of Mg and rare earth in molten iron is low,
the pouring temperature is high, the heat dissipation is slow here,
the casting structure and the casting fillet are too small.
Therefore, it is necessary to use the nodule agent with
high Mg content and RE content.
Use alkaline paint. Increased cooling and enhanced heat dissipation.
Pure raw material, less organic matter.
seven, linear arrangement of graphite: mainly because the CE value is too low,
long holding time, breeding effect is not good,
pouring temperature is too high.
Therefore, under the premise of ensuring that there is no coarse graphite,
the CE value should be appropriately increased.
Reduce the superheat, 1520 degrees above holding time within 40 minutes;
Increase the inoculum or use a strong inoculum.
Follow me for more casting tips ~
Today, I will take you to continue to understand
the metallographic adverse reactions of ductile iron
six, surface reaction layer: mainly because of molding sand,
coated sand containing N, S, O amount is too high.
The content of Mg and rare earth in molten iron is low,
the pouring temperature is high, the heat dissipation is slow here,
the casting structure and the casting fillet are too small.
Therefore, it is necessary to use the nodule agent with
high Mg content and RE content.
Use alkaline paint. Increased cooling and enhanced heat dissipation.
Pure raw material, less organic matter.
seven, linear arrangement of graphite: mainly because the CE value is too low,
long holding time, breeding effect is not good,
pouring temperature is too high.
Therefore, under the premise of ensuring that there is no coarse graphite,
the CE value should be appropriately increased.
Reduce the superheat, 1520 degrees above holding time within 40 minutes;
Increase the inoculum or use a strong inoculum.
Follow me for more casting tips ~
