Nodular cast iron nodular cast iron factory need to pay attention to what issues?
Sulfur content of the original molten iron and other trace elements don't too high.
If the liquid sulfur content of iron and other trace elements content is too high, you need more for the amount of nodularizer nodularizer or rare earth content is higher, so the cost of nodularizer will increase, and too much can cause more pulp are nodularizer, is not conducive to the stability of the casting quality.
In the cross section of the rare earth content is too much, will be in the big easy generation fragmental graphite casting.
The stability of the spheroidizing treatment.
Spheroidizing process is the key in the process of ductile cast iron production process, only the spheroidizing process stability, the quality of the castings can be stable.
According to different products, different original iron liquid sulfur content, how much to join nodulizing agent, nucleating agent, etc. , all want to write wi and strictly implemented.
To avoid long waiting time.
After spheroidizing inoculation, should immediately pouring.
As the extension of time, the residual magnesium will be burning and inoculation effect will be a recession.
Avoid too high residual magnesium content.
High residual magnesium content increases the casting shrinkage tendency, for nodular cast iron, the average residual magnesium content (
The mass fraction)
Should be controlled in 0.
035% ~ 0.
045%, for high ni ductile iron, residual magnesium content should be controlled in 0.
06% ~ 0.
Higher requirements for the casting using good nucleating agent.
Higher requirements for wind power, high iron parts, etc. , should choose the inoculation effect strong agent metal-stream (
If has the patent Ultraseed/Ce)
Characterized by a significant increase of graphite ball, and graphite ball roundness.
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