... large cast iron casting parts 1. High intensity and rigidity 2. Strict quality control OEM large cast iron manhole covers DescriptionMaterialTechnical ... ironcastingsASTM A 536-Gr.60-40-18,etcDIN GGG40,GGG50,700-2,etcJIS FCD40,FCD50 etcBS Gr370-17,Gr420-12,etcGreen-sand ...