Magnesium content in the casting which is preserved as a residue after treatment and the associated bonding of the sulfur. Determination of an optimum magnesium residual content for the existing product mix is a very important task that also serves for quality assurance. The following factors have to be taken into account in this context:
The residual magnesium content should generally be between 0.035 and 0.055%.
Additional references:
Nodular graphite cast iron
Inoculation
Magnesium fading
Magnesium yield
Fading effect