1:seamless steel pipe 2:OD:9.5--219mm 3: ... fenggangLength: 3M,6M,12M,Specification: ASTMA315B,ASTMA53A,ST37Usage: gas transport,boiler,heat exchangerStandard: ASME, ANSIGrade: A53B, API J55, API ... K55, Q195, Q215, Q235...Outer Diameter: 6MM-1000MMseamless steel pipe: 1)standard: GB,DIN,ASTM,EN,BS,AND, ... 21.3mm-711mm b) wall thickness:0.5-55mmseamless steel pipeSteel standard : ASTM.JIS,DIN,GB,EN,BS. ...