SteelsforHydrogenService atElevatedTemperaturesand PressuresinPetroleumRefineries andPetrochemicalPlants APIRECOMMENDEDPRACTICE941 EIGHTHEDITION FEBRUARY2016 ERRATA1 JUNE2016 ERRATA2 JANUARY2018 ADDENDUM1 AUGUST2020 American Petroleum Institute
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Contents Page Scope 2 Normative References 1 3 Operating Experience.. 2 3.1 BasisforSettingIntegrity OperatingWindows. 2 Selecting Materialsfor New Equipment. 2 High Temperature Hydrogen Attack(HTHA) in a Liquid Hydrocarbon Phase. 4 3.4 BaseMaterialforRefractory-lined EquipmentorPiping 4 3.5References and Comments forFigure 1. 4 4 Forms of HTHA .. 7 4.1 General..... 7 4.2Surface Decarburization.... 8 4.3Internal Decarburization，Fissuring and Cracking 5 FactorsInfluencingInternalDecarburization，Fissuring andCrackingCausedbyHTHA 9 5.1 Incubation Time... 9 5.2 Effect of Primary Stresses. 11 5.3 Effect of Secondary Stresses.... 11 5.4Effect of HeatTreatment. 11 5.5Effectof StainlessSteel CladdingorWeld Overlay 12 6 Inspectionfor HTHA 13 AnnexA(informative)HTHA of 0.5MoSteels. 15 AnnexB(informative)HTHA of1.25 Cr-0.5MoSteel. 25 AnnexC(informative)HTHA of 2.25Cr-1MoSteel 27 AnnexD(informative)EffectivePressures of Hydrogen inSteel Covered by Clad/Overlay 29 Annex E(informative) Summary of Inspection Methods. AnnexF(informative)HTHAofNon-PWHT'd CarbonSteels 34 Annex H(informative) Internal Company Data Collection-Requestfor New Information. 41 Bibliography.... 43 Figures 1 Operating LimitsforSteels in HydrogenService toAvoid HighTemperature Hydrogen Attack. 2 C-0.5MoSteel(ASTMA204 GradeA)Showing InternalDecarburization andFissuring in High Temperature Hydrogen Service.... IncubationTime for HighTemperature HydrogenAttackDamageof CarbonSteel(Non-welded or Welded withPostweld Heat Treatment) in High Temperature HydrogenService... 10 16 A.2Steels in HighTemperature Hydrogen Service Showing Effect of Molybdenum andTrace Alloying Elements.... 22
API RP 941-2016 （2020）石油炼油厂和石化厂在高温高压下供氢用的钢材(英文版).pdf
