... pressure supporting pipes GB/T17398-1998 of 27SiMn; Pipes for structure GB/T8162-1999 of 10, 20, 35, 45, 40Mn2, 45Mn2, 27SiMn ... , 20Cr, 40Cr, 20CrMo, 35crMo, 38CrMoAl, 50CrV, 30CrMnSiPipes for feeding liquid ... GB/T8163-1999 of 10, 20, Q295, Q345Oil pipes for oil well and hoop pipe ...