... DN80 mm-800 mm);Material: Aluminum carbon steel, stainless steel and alloy steelSurface treatment: Transparent oil, rust-proof oil.Packing: ... Blind, Welding Neck, Threaded, Lapped, Orifice, Figure 8 Blind, Swivel and etc,we can produce as per buyers special requirements.Process ... : free forging, plate cutting;Stainless steel flange and carbon steel flange and aluminum flange aluminium flange