1、AN AM E R IC AN NAT IO NAL STANDARDASME B31T-2021(Revision of ASME B31T-2018)StandardToughnessRequirementsfor PipingASME Code for Pressure Piping,B31ASME B31T-2021(Revision of ASME B31T-2018)StandardToughnessRequirementsfor PipingASME Code for Pressure Piping,B31AN AMERICAN NATIONAL STANDARDTwo Park
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11、art of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2021 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll r
12、ights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B31 Committee.viIntroduction.viiiSummary of Changes.x1General.12Glossary.13Low-Temperature Ranges and Requirements.14Impact Testing Methods and Acceptance Criteria.65References.8Mandatory AppendicesIImpact Te
13、st Exemption Curves.37IIStress Ratio Curves.43IIIMaterial Groupings by T-Number.45Nonmandatory AppendicesAFlowchart of Requirements.53BGuidelines for Establishing T-Number Group.55FiguresI-1Impact Test Exemption Curves for T-Number Groups CS A,CS B,CS C,and CS D(U.S.CustomaryUnits).38I-1MImpact Test
14、 Exemption Curves for T-Number Groups CS A,CS B,CS C,and CS D(SI Units).39II-1Stress Ratio Curve(U.S.Customary Units).43II-1MStress Ratio Curve(SI Units).44A-1Flowchart of Requirements.54Tables3.1-1Low-Temperature Service Requirements by Material Group.123.2-1Material Groupings by Material Specifica
15、tion.284.4.2-1CharpyImpactTest(AbsorbedEnergy)TemperatureReductionforMaterialorSpecimens 0.3Temp.,C,WithoutImpactsSR 0.310.90.80.70.60.50.40.3Carbon SteelsCS 55Max.possibleCharpyt 2.5 mmNote(2)294848291044848484848484848104CS 55Max.possibleCharpyt 2.5 mmNote(3)2948291044848484848484848104CS 50Max.po
16、ssibleCharpyt 2.5 mmNote(2)294848291044848484848484848104CS 50Max.possibleCharpyt 2.5 mmNote(3)2946291044648484848484848104CS 20Max.possibleCharpyt 2.5 mmNote(2)294848291044848484848484848104CS 20Max.possibleCharpyt 2.5 mmNote(3)2929291042934404648484848104CS 20(A)2929292929N/ACS 018181829291823293440484848104CS+20(A)77777N/ACS A10.0Max.possibleCharpyt 0.3Temp.,C,WithoutImpactsSR 0.310.90.80.70.60.50.40.3Carbon Steels(Contd)CS A10.0Max.possibleCharpyt 2.5 mmNote(3)777104712182329404848104CS A11.