... Fine Grinding, QC of external surface(Visual exam of inner pipe, appearance inspection, roughness, roundness, outside diameter thickness). Then degreasing is ... steps, namely degreasing, passivation, RO water rinse. After another inspection, all tubes can be packed and ready for shipment. We ... . For metal, we are serious.Specification of Polished Stainless Steel Pipe Size OD: 4.0 ~ 1219mm; WT: 0.5 ~ ...