... mm W.T :3-40mm Brand:Tigersteel API 5L ASTM A 53/A106 Gr.B seamless steel tube,line pipe & oil & gas line Standard ... /T3091-2008,EN39,BS1139Material Carbon steel :ASTM A 53/A106 GR,B ,X42.X52. Q195,Q235,Q345...... Quality PrimeTechnique ERW, seamless, weldedO.D. 1/2 ... , Africa, etc.Contact Person Amanda Cui 15563512134 API 5L ASTM A 53/A106 Gr.B seamless steel tube,line pipe & oil & gas line pipe ...