... 4>Surface:Pickling,Polishing AISI 309S Stainless Steel Welded Pipe CommodityStainless Steel Pipe/TubeDescriptionStainless Steel Seamless Pipe/ ... Tube,Stainless Steel Welded Pipe/TubeStandard ASTM A213,ASTM A312,ASTM A269, ... steel pipe is widely used in Boiler,Structure,Architecture,Machine Manufacture,Electric Factory,Power Station,Shipping,Oil and ...