Carbon Steel Flange , Slip On Flange Threaded Flange , Blind Flange Socket Welding Flange, Alloy flange,Plate Flange large size of stainless steel flange ANSI Flange Size:1/2" ~ 64"(DN15 ... covers every process of the manufacturing-Raw material inspection, cutting, heating, gorging, heat treatment, machining, drilling, marking, washing, final inspection, packing ...