... Finish: POLISH,ACID,HL,200# polishing, 400 # polishing 202 welded tube Stainless steel is a production which not easy rust,acid ... , 42CrMo, 12Cr1MoVG,Cr5Mo,WB36,BCrMo44,34CrMo4,P5,12CrAISI1010,1020,1045,Gr·65 ,API X52,API X 42and so oneotherDIN,JISspecificationOut diameter6mm ... Company will offer warm-hearted service to you ! 202 welded tube