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Threaded Flange Threaded Flange has its inner bore surface designed as tubular thread,which matches with threaded pipe to achieve connection.Therefore,no welding is required.Compared with slip-on welding or welding neck flanges.it featured easier installation and more convenient maintenance. The flange can be applied in situations where welding is forbidden.When it comes to alloy steel flange,which has enough strength but poor welding performance.users can choose threaded flange as well.To avoid leakage,it is not recommended for pipeline involving dramatic temperature change and occasions with