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"Interfering elements" are those that have a negative effect

 on the properties of gray cast iron and ductile iron, 

and are not necessarily the so-called harmful elements.

There are three sources of interference elements:

One is the harmful elements usually contained 

in steel castings and iron castings,

 such as sulfur, phosphorus, lead, etc.;

The second is alloying elements specially added to 

improve the properties of steel, 

such as manganese, chromium, molybdenum, etc.;

The third is the pollutants mixed in the charge.

These "interfering elements" have a great influence 

on the properties of cast iron, 

and will form carbides, affect graphite spheroidization,

 increase the tendency of shrinkage cavities, 

and reduce the strength of gray cast iron, etc.

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