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Q345B/Q355/16Mn low alloy Steel Seamless Pipe Alloy steel pipe Standard & Mate GB5310-2013 Standard: 20G,25MnG, 15MoG,15CrMoG, 20MoG, 12CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, 15CrMoG, ...