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Spheroidal Graphite Iron Spheroidal Graphite Iron is usually supplied as grade 400-15 cast iron which is a continuously cast iron available in round bar or block. Spheroidal Graphite Iron offers good optimal impact, fatigue, electrical eonductivity and magnetic permeability. Noise and vibration damping are good in Spheroidal Graphite Iron grades.   Other Spheroidal Graphite Iron grades available are 700-2 600-3 and 500-7. Continuously Cast Spheroidal Graphite Iron  -  SG Iron  400-15 TYPICAL ANALYSIS        C. Mn. Si. S. P. Mg. 3.50% 0.30% 2.60% 0.02% 0.05% 0.05% Available forms:           Spheroidal Graphite Iron S G Iron Cast Iron Grey Iron Ductile Iron Unibar 200 250 300 400-15 500-7 600-3 BSEN 1561 BS EN 1561 GJL200 GJL250 400/15 SG Irion Meehanite Mehanite