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High quality steel Astm A335/Asme Sa335 alloy steel pipe Gr P22 14 "Sch100 The materials of alloy steel pipes can be divided into 12-42CrMo, T91, 30CrMo, 20G, 15CrMoV, Cr9Mo, 27SiMn, 10CrMo910, 15Mo3, ...