... heat exchanger, stainless steel seamless pipes GB/Tl4976-02 for liquids, stainless steel seamless pipes GB/T14975-02, ASTM, A269, ... 1Cr2Mo and 1Cr5MoHydraulic pressure supporting pipes GB/T17398-1998 of 27SiMn; Pipes for structure GB/T8162-1999 of 10, 20, 35, 45, ... , 40Cr, 20CrMo, 35crMo, 38CrMoAl, 50CrV, 30CrMnSiPipes for feeding liquid GB/T8163-1999 of 10, 20, Q295, Q345Oil pipes for oil well and ...