... tech we manufactured new kindof cast iron profiles ---Cast Iron Hollow Bar , which have been tested by chinese authority sector ... Iron--High Ni Cast Iron...III. Specification: ---Cross-Section:Round,Rectangle,Elliptic,Hexagonal ---OD:60-320mm,Thickness:8-35mmOur ... to strict requirments in precise manufacturing.The size of the hollow round profile: (DN)Outside diameter (mm) (δ)Range of pipe wall ...