Question: What is the role of S and O in cast iron?
S and O are added to the cast iron melt in order to
make the melt more sensitive to inoculation.
In ductile iron production,
the melt is Mg-treated with pure Mg or MgFeSi in subcontracting.
The purpose of this treatment is to suppress
the surface active elements S and O,
thereby changing the growth morphology of graphite from flake to spherical.
If the content of S and O in the melt is very high,
in order to obtain ductile iron,
it is necessary to add more Mg before spheroidizing treatment,
which will lead to more slag and smoke;
Too high S content also negatively affects
the graphitic structure of ductile iron.
When S cannot be inhibited, it may react with Fe to form FeS.
The result of this is a decrease in the mechanical properties of the casting,
especially the decrease in high temperature properties.
Too high an O content can lead to an increase in the amount of slag,
which increases the risk of defects in the finished casting due to slag.
Although the S content in grey iron is higher than that in ductile iron,
it is still important to keep in mind:
Although S will increase the response to the inoculant,
it will also increase the propensity to generate MnS pores
and anti-white mouths.
The inoculant products produced by our
Nanjing DiFeng have optimized raw materials,
quality assurance, and can also be customized
according to the standards required by customers.
Welcome to consult and place an order.
S and O are added to the cast iron melt in order to
make the melt more sensitive to inoculation.
In ductile iron production,
the melt is Mg-treated with pure Mg or MgFeSi in subcontracting.
The purpose of this treatment is to suppress
the surface active elements S and O,
thereby changing the growth morphology of graphite from flake to spherical.
If the content of S and O in the melt is very high,
in order to obtain ductile iron,
it is necessary to add more Mg before spheroidizing treatment,
which will lead to more slag and smoke;
Too high S content also negatively affects
the graphitic structure of ductile iron.
When S cannot be inhibited, it may react with Fe to form FeS.
The result of this is a decrease in the mechanical properties of the casting,
especially the decrease in high temperature properties.
Too high an O content can lead to an increase in the amount of slag,
which increases the risk of defects in the finished casting due to slag.
Although the S content in grey iron is higher than that in ductile iron,
it is still important to keep in mind:
Although S will increase the response to the inoculant,
it will also increase the propensity to generate MnS pores
and anti-white mouths.
The inoculant products produced by our
Nanjing DiFeng have optimized raw materials,
quality assurance, and can also be customized
according to the standards required by customers.
Welcome to consult and place an order.
