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This web page tucson-hydrocontrols.blogspot.com states the following, "Wednesday, February 25, 2015." We saw that the webpage said " SG Iron as a replacement for Steel in Hydraulic Manifolds." It also said " Cast Iron is a material with a history stretching over two and a half millennia. The earliest recorded use of cast iron was in China in the 5th century BC and has since been used in almost every aspect of human life from cookware to cylinders, banisters to bridges and ovens to overhead gantry cranes. Physical Structure of Ductile Iron. The Process of Continuous Casting. 4 A cut-off saw notches the bar for cutting."