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ASTM A335 P5 P9 P11 P22 P91 Alloy Steel Pipe Size: 1/2" - 80" Standard: ASTM, ANSI B36.10M-2004, ASTM A335-2006, ASTM A335M-2006, ASTM,ASME/ANSI,API,DIN,EN,BS,JIS,GB Grade: A53-A369, A335 P1, A335 P11...