... jis Wt: 2.24-610mm Outsides diameter: 1/4"-24"(od: 1307-610) Thinkness: Sch40, sch80, sch160 Maritial: 10#, 20 ... , chemical industry, elkectric power, aviation, ship, etc.The seamless steel pipes for use in low and medium pressures boilers, petroleum casing ... pipes, ships, fluid conveyance, structures, chemical fertilizer equipment, and hollow ...