1:seamless steel pipe 2:OD:9.5--219mm 3:Thickness(mm):0 ... API K55, Q195, Q215, Q235...Outer Diameter: 6MM-1000MMseamless steel pipe: 1)standard: GB,DIN,ASTM,EN,BS,AND,SO,ON ... : 21.3mm-711mm b) wall thickness:0.5-55mmseamless steel pipeSteel standard : ASTM.JIS,DIN,GB,EN,BS.Material ... ,STPA23,STPA24,STPA25,STPA26,13Crmo44,10crmo910, 12crmo195,20#,35#,45#,20G, 20MnG,20A,A106B,A106C,ST45.8, 12CRMO,15CRMO ...