ASTM A53 B heat insulation steel pipe OD:10.3mm-219.1mm WT: ... -50mm Length:6m,random length Application:dyraulic pipe ASTM A53 B heat insulation steel pipeOD:10.3mm-219.1mmWT:1mm-50mmLength ... :16Mn,20#,45#,Q235,Q345,15CrMo,12CrMo etc. ASTM A53 B heat insulation steel pipe,ISO,PED,API certificate,ASME B36 ...