... 53/A106 Gr.B seamless steel tube,line pipe & oil & gas line Standard: API 5L Grade : API 5L ASTM A53/A106 GR.B Size ... ,EN39,BS1139Material Carbon steel :ASTM A 53/A106 GR,B ,X42.X52. Q195,Q235,Q345...... Quality PrimeTechnique ERW, seamless, weldedO.D ... ,Payment T/T 20% advance ,blance against of B/L copy Market East Asia, Southeast Asia, Middle East, Europe, North America, South America ...