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SA182-F51 Duplex Stainless Steel Ball Valve Forging Ball Cover Forgings Blanks Rough Machined (1) Material Stardard: ASTM/ASME-2013 SA182-F51 (2) Element(%): F51 UNS S31803 C≤ 0.030 Mn≤ 2.00 P≤ 0.030 ...