Surface grinder double column

Hi Jim/ guy’s i would have a information about cast iron want to purchase and I searched about but confused me about grade
Grey cast iron is good to use but as size i want to use i cant found here, is another cast SG ductile cast 500-7 or 500+ both have wear resistance, dumping... this grade can found 200x200square reading of characteristic you can hardened but I don’t know if is necessary I'm not sure witch one to chose. Any help?
I was trying to casting but moulding is really expensive compared with casting it self
 
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