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Method for controlling active magnesium in ductile cast iron

The present invention relates to a method for controlling if the amount of active magnesium in a treated melt is above or below a certain level which comprises the following steps:

  1. providing a thermal analysis cup with tellurium, a thermocouple, a metallic cap, and a controlled amount of a neutralizing mixture of sulfur and FeSi, said mixture comprising: a) from 0.07 to 0.25 wt% of FeSi in respect of the weight of the test sample of the treated liquid iron which is poured into it in the next step and b) a number of equivalents of sulfur which is the same as the number of equivalents of active magnesium which correspond to the said certain level to be determined,
  2. pouring into the thermal analysis cup treated melt
  3. recording a cooling curve 
  4. identifying according to the shape of the curve, if the test sample has solidified at the graphite eutectic or at the carbide eutectic.

The present invention relates also to a thermal analysis cup for use in said method.


Jon Garay, Ramón Suárez, Pello Larrañaga.


Pearlitic cast iron, iron foundry, improved mechanical properties, as cast, thermal cup, thermal analysis.


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