ProcessingOfLarge-DiameterFlangesPrefabricatedSpoolsSize:1/2"~48"（DN15~DN1200）Material:Stainlesssteel(304,304L,316,316L,317L,310S,321)Surface:PassivationAfterPolishingAndSand-BlastingStandard:GB,A***E/ANSI,JIS,BS,DIN)