1/2'' -14" carbon Cold drawn seamless steel pipe ASTM A106/A53,API 5L GR.B, O.D.: 13.7-355mm W ... ,ASTM A53-A369,DIN ST35-ST52, BS 1387O.D.1/4"--30",samll diameter OD:13.7-141mmW.T.SCH10 ... ,Electricity,Machine building industy,Chemical industy,Petroleum,Traffic.Tolerance OD :+1% / -1% WT: +12.5% / -10% Main marketAsia, India, Middle East, ... 1629Q345ST52 0.12~0.200.20~0.551.20~1.60≤0.035≤0.035≤0.25≤0.25/≤ ...