Today, Let's talk about the other 3 principles of
the 6 golden principles for selecting ductile iron castings.
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4. The principle of selection of phosphorus
Phosphorus is a harmful element.
The phosphorus content in ductile iron should be as low as possible,
generally less than 0.08%.
For more important castings,
the phosphorus content should be less than 0.05%.
5. The principle of selection of sulfur
Sulfur is an anti-spheroidizing element.
It has a strong affinity with spheroidizing elements
such as magnesium and rare earth,
and forms sulfides of magnesium and rare earth.
Therefore, the presence of sulfur will consume a large amount of
spheroidizing elements in the molten iron, causing clipping.
Casting defects such as slag and pores.
The content of sulfur in ductile iron
is generally required to be less than 0.06%.
6. Selection principle of spheroidizing elements
The spheroidizing elements currently used in
industry are mainly magnesium and rare earths.
On the premise of ensuring qualified spheroidization,
the residual amount of magnesium and
rare earth should be as low as possible.
Excessive magnesium and rare earth residues will
increase the whitening tendency of molten iron and
affect the mechanical properties of castings
due to their segregation at grain boundaries.
Follow me, the youngest girl in the factory,
see you next time, bye~
the 6 golden principles for selecting ductile iron castings.
Remember to like and favorite~
4. The principle of selection of phosphorus
Phosphorus is a harmful element.
The phosphorus content in ductile iron should be as low as possible,
generally less than 0.08%.
For more important castings,
the phosphorus content should be less than 0.05%.
5. The principle of selection of sulfur
Sulfur is an anti-spheroidizing element.
It has a strong affinity with spheroidizing elements
such as magnesium and rare earth,
and forms sulfides of magnesium and rare earth.
Therefore, the presence of sulfur will consume a large amount of
spheroidizing elements in the molten iron, causing clipping.
Casting defects such as slag and pores.
The content of sulfur in ductile iron
is generally required to be less than 0.06%.
6. Selection principle of spheroidizing elements
The spheroidizing elements currently used in
industry are mainly magnesium and rare earths.
On the premise of ensuring qualified spheroidization,
the residual amount of magnesium and
rare earth should be as low as possible.
Excessive magnesium and rare earth residues will
increase the whitening tendency of molten iron and
affect the mechanical properties of castings
due to their segregation at grain boundaries.
Follow me, the youngest girl in the factory,
see you next time, bye~
aa
