... T :3-40mm Brand:Tigersteel API 5L ASTM A 53/A106 Gr.B seamless steel tube,line pipe & oil & ... GB/T3091-2008,EN39,BS1139Material Carbon steel :ASTM A 53/A106 GR,B ,X42.X52. Q195,Q235,Q345...... Quality ... ,Payment T/T 20% advance ,blance against of B/L copy Market East Asia, Southeast Asia, Middle East ... .Contact Person Amanda Cui 15563512134 API 5L ASTM A 53/A106 Gr.B seamless steel tube,line pipe & oil & ...