A335 GR P11 Alloy ANSI B16.25 steel Pipes Size: 1/2"- ... , 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo, 12Cr2MoISO 9329-2-1997 for high pressure --Chemical fertilizer equipmentASTM A161-94Seamless steel tubesGB9948-8610 ... , 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, JIS G3441-1988for petroleum cracking A335 GR P11 Alloy ANSI B16.25 steel Pipes