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Hot Forging F51 F55 Stainless Steel Disc Used in Machinery Stainless Steel Forgings Material: Stainless Steel: SUS 304, 304L, 316, 316L. Q345E,S355NL Alloy: 34CrNiMo4,42CrMo,42CMo4,31 CrMoV918CrNiMo7...