... -821.The material of pump casing is Ductile Iron and Grey Iron, Alum-Bronze etc.2.We cast them by Resin Sand ... supply the products as follows:1) Materials include: Stainless Steel, Carbon Steel, Alloy Steel, Ductile Iron, Grey Iron, Copper, Aluminum Bronze, Malleable ... Stamping etc.3) Machining Types: Machined by Round Bar and steel plate, Drilling, Milling, Turning, Boring, Slating, Grinding,, NC/CNC ...