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ASTM A335 p2 p5 p9 p11 p12 p22 p91 seamless alloy steel pipe Standard & Material: GB5310-2013 Standard: 20G,25MnG, 15MoG,15CrMoG, 20MoG, 12CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, ...