ASTM A213 TP316 / TP316L / TP316Ti / TP316H/ ASTM B 677 904L Stainless Steel U Bend Tube U-BendTubearewidelyusedinHeatExchangerSystems.Heat-ExchangerEquipmentonthebasisof SeamlessStainlessU-TubesandWeldedStainlessUbendTubeisessentialinstrategicallyimportantand criticalfelds---NuclearAndPetrochemicalMachineBuilding. XinzhouGroupStarttoProduceUBendingTubeSince2006,Uptonowalreadysupplymorethan 30000tonsStainlessSteelUBendTubeto35countries. TheU-BendTubeComplyWithTheFollowingStandards: 1.ASTMA688/ASMESA688 2.ASTMA803/ASMESA803 3.ASTMA556/ASMESA556 SteelGrade: ---- Ferrite | Austenite | Duplex | SuperDuplex | Ni-Alloys | Titanium | TP410 TP405 S44400 S44660 TP430 | TP304/304L TP316/316L TP316Ti TP317/317L TP321 TP347 | S31803 S32205 S32304 | S32750 S32760 | N06600 N08020 N00880 N08825 N08904 | Gr.2 | ---- TubeOfOtherAlloysAndSteelGradesCanBeProducedUponAgreement. TechnicalRequirements: StraightTubes Standard Specification ForBending: ASMESA213;ASMESB163;ASMEA789,ASMESA268,ASMESA269,etc. Marking:BeforeBendingByMarkingMachineAllOverTheTubeLength(BentSectionAfterHeat TreatmentWithoutMarking) Note:MarkingisalsopossibleAfterBendingOnTheStraightPartsOfU-BendingTube. U-BendTubes: -TEMARCB2.31StandardOfTheTubularExchangerManufacturersAssociation(9thEdition). -ASTMA688/ASMESA688StandardSpecificationForWeldedTubesOfAusteniticCorrosionResistant SteelGradeDesignedForFeedWaterBoilers. -ASTMB163/ASMESA163StandardTechinicalRequirementsForTubesOfNickelAndNickelAlloyFor CondensersAndHeatExchangers. -CustomerSpecifications. BendingRadius:From1.5*OD(OutsideDiameter)To1500mm WhenOrderingTubesWithRadiuslessorequalto1.5*OD,ItIsNecessaryToAgreePrecisionOfGeometrics. StraightTubesMaximumLength:(BeforeBending):35000mm. LegLength:Min1Meter,Max.16500mm(ForMaxR=1500mm) Note:OtherSizeAreAvailableUponAgreement. HeatTreatment:StressRelievedAfterU-Bending(BendingAreaPlus300MMForEachLeg). HydrostaticTestAfterUBending:MaximumTestPressure600Bar,Soaking10Sec.With DematerializedWater.CompressedAirCleaningAfterHydro-Test. Packaging:InStrongTransport-WorthyPre-fumigatedwooden boxesofcorrespondingdimensionsfor eachtubeLength,Radius,Diameter,AccordingToPO requirements aswellas wrappedIn polyethylene filmsWith soft plastic caps on both endofTube. Features : # 'U' bending is done by cold working process. # 'U' bending is done to the required radius as per customer drawings. # The bend portion and six inch leg is stress relieved by resistance heating. # Inert gas (Argon) is passed through it at the required flow rate to avoid oxidation in ID. # The radius is checked for its OD and wall thinning with the recommended specification. # The physical properties and micro-structure is checked at three different position. # Visual inspection for waviness and cracks is done with Dye Penetrant Test. # Each tube is then hydro tested at the recommended pressure to check for leakage. # Cotton ball test is done to check the ID cleanliness of the tube. # Thereafter pickled, dried, marked and packed. # All procedure is strictly followed as per TEMA "C" and ASTM A-688.
