1、AN AM E R IC AN NAT IO NAL STANDARDASME B31P-2017Standard Heat Treatments for Fabrication ProcessesASME Code for Pressure Piping,B31ASME B31P-2017Standard HeatTreatments forFabricationProcessesASME Code for Pressure Piping,B31xDate of Issuance:May 15,2018The next edition of this Standard is schedule
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11、 of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2018 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.vCommittee Roster.viCorrespondence With the B31 Committee.viii1Introduction.12Glossary.13Temperature Measurement.14Temperatu
12、re Control.25Welding Preheat.36Postweld Heat Treatment(PWHT).47Postforming and Material Heat Treatments.68Alternatives and Exemptions to Preheat and PWHT Requirements.9Nonmandatory AppendicesARecommendations for the Proper Use of Thermocouples.10BRecommendationsforControlofNarrowTemperatureRangeHeat
13、Treatments:LocalHeat-TreatmentMethods.11CBranch Connection Examples.26DTemper Bead Method Alternative to PWHT.28EFracture Mechanics Alternative to PWHT.29FiguresB-3.1-1Definition of Terms for Local Circumferential Band Heating of Pipe Weld.12B-3.1-2DefinitionofTermsforLocalCircumferentialBandHeating
14、ofBranchConnectiontoPipeAttachmentWeld.13B-5.2-1LocationofThermocouples(MonitoringandControl)forPipeSizesLessThanNPS6(150DN)andOneControl Zone.15B-5.2-2Location of Thermocouples(Monitoring and Control)for Pipe Sizes NPS 6(DN 150)Up to andIncluding NPS 12(DN 300)and Two Control Zones.16B-5.2-3Locatio
15、n of Thermocouples(Monitoring and Control)for Pipe Sizes NPS 14(DN 350)Up to andIncluding NPS 30(DN 750)and Four Control Zones.17B-5.2-4Location of Monitoring Thermocouples for Branch Nozzle or Attachment Welds.18B-5.3-1ExampleofOneApproachWhentheHeatedBandFromaWeldRequiringPWHTIntersectsaWeldNotReq
16、uiring PWHT.20C-1Typical Branch Attachment Details That May Be Used to Calculate Control Thickness.26C-2TypicalIntegrallyReinforcedOutletFittingBranchConnectionDetailsThatMayBeUsedtoCalculateControl Thickness.27Tables5.1-1Preheat Temperature.36.1.1-1Postweld Heat Treatment.5iii6.1.1-2Alternate Postweld Heat Treatment Requirements for Carbon and Low-Alloy Steels,P-Nos.1 and 366.1.1-3Exemptions to Mandatory Postweld Heat Treatment.76.2-1Approximate Lower Transformation Temperatures.9B-5.1-1Require
