1.ASTM,A106/A53,GR.B 2.O.D:1/4"-38" ... 4.CER: ISO9001-2008/API 5L Cangzhou Rize Pipe Manufacturing Co.,Ltd DescribeERW Steel PipeMaterial 10# 20# 45# 16Mn , ST52, ... warpped with plastic bag or as per customers' requirementStandardASTM A106 , ASTM A53 , GB , BS , JIS Packing Containers or bundles by sea ... industry , fluid transfer , gas transfer , structure , scaffuld ,etc ERW carbon steel pipe