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In the standart composition of Hadfield steel the phosphorus contents are max 0,07% wt. I'm finding hard to find information of the efects of these percentage of phosphorus in this alloy.Is there a way of reducing phosphorus content?

It was used no-bake moulding and cooled inside the mould (the mould left in ambient temperature).

I'm having macrosegregation problems with a 0,3 %wt carbon steel. The diameter of the part is quite thick, 80 mm, so I found carbon percent of 0,28% in the surface and 0,39% in the segregation region (in the center of the part).