... and electricity plant facilities, stainless steel seamless pipes GBl3296-9l for boiler and heat exchanger, stainless steel seamless pipes GB/ ... pressure alloy pipes of A335P11, P91, P92, etc; Primoric carbon pipes for high-pressure boiler GB5310-95 of 20G, 20MG, 25MG, ... , 45Mn2, 27SiMn, 20Cr, 40Cr, 20CrMo, 35crMo, 38CrMoAl, 50CrV, 30CrMnSiPipes for feeding liquid GB/T8163-1999 of 10, 20, Q295, Q345Oil ...