... high-pressure fertilizer facilities and electricity plant facilities, stainless steel seamless pipes GBl3296-9l for boiler and heat exchanger, stainless ... 10G, 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo and 12Cr2Mo; Pipes for oil cracking GB9948-86 of 10, 20, 12CrMo, ... 15CrMo, 1Cr2Mo and 1Cr5MoHydraulic pressure supporting pipes GB/T17398-1998 of 27SiMn; Pipes for structure GB/T8162-1999 of ...