sell spiral steel pipe Q235 standard:API,ASTM,ASME,ANSI,JIS,DIN,BS,GB,ISO ... material:API 5L, A53,A106,A333 GR6,Q235,Q345 sell spiral steel pipe ... oil; gas & Petroleum productsASTM A252 WELDEDAND SEAMLESS STEEL PIPE PILES BS534, BS 3601 DIN 1626, DIN 2460,TS1997 ... manufactured flanged are welded to the ends of the pipe and then jointed with bolts. Test:Chemical Component ...