... carbon steel pipe 2.material:Astm a 53/106/ API 5LA/B,ST37,ST35.8;Standard:ASTM,DIN,JIS 3.ISO and SGS certificate Seamless Pipe ... ,API ,ANSI ,GB, SH,HG, MSS,JIS,DINMaterialASTM A106 GRB/ A53 GRB/ API 5L GRB/ API 5 CT /Q345/A335/ST37/ST52Packagingpainting black, pipe cap, steel strips ... are made under the ISO9001:2000 strictly.Kewords:seamless pipe,carbon steel pipe,butt welded pipe carbon steel pipe