... CE 5)Standard: ASTM BS GB JIS APISize(O.D)Wall thickness (W.T.)15mm*15mm-600mm*600mm0.5mm-30mmLength2m-12m ... . We have cooperated with Bao steel, Wu yang steel, TPCO, Baotou steel, Shou gang Jin tang Steel, An gang Steel, Daye Steel, HBIS and other major ... steel manufactures in China. And all ...