astm a572 gr.50 welded steel tube 1.Certificate ISO9001:2008 ... delivery time JS brand astm a572 gr.50 welded steel tube DescriptionDetails astm a572 gr.50 welded steel tubeOut Diameter18mm- ... A106 ,A179 A53,, EN10305-1,EN10305-4,DIN17175Grade 10#,20#,35#,45#,20cr,40Cr,20CrMo,16mn,ST35, ST37,ST37. ... Daisy PLS contact me at any time astm a572 gr.50 welded steel tubeWe are direct producer and supplier, ...