Designation:F2328M−14StandardTestMethodforDeterminingDecarburizationandCarburizationinHardenedandTemperedThreadedSteelBolts,Screws,Studs,andNuts(Metric)1ThisstandardisissuedunderthefixeddesignationF2328M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversproceduresformeasuring,classifying,anddeterminingthepresenceofdecarburizationandcarburizationinthethreadedsectionofhardenedandtemperedmetricsteelbolts,screws,studs,nutsandsimilarpartswhichhavebeenheatedtofacilitatefabricationortomodifytheirmechanicalproperties.Thistestmethodisnotintendedtoaddressproductswhichareintentionallycarburizedtoachievespecificresults.1.2Tworoutinemethodsaredescribedformeasuringthelimitsofanddeterminingthepresenceofdecarburizationorcarburization;theOpticalMethodandtheMicroindentationMethod1.Eithermethodisappropriateforroutineexamina-tions.TheMicroindentationMethod2shallbeconsideredtherefereemethod.1.3Forthepurposeofthesetests,therearefiveclassesofhardenedandtemperedsteelproductsforwhichspecificmeasurementsmustbemadewithrespecttotheirphysicalproperties.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A574MSpecificationforAlloySteelSocket-HeadCapScrews(Metric)E3GuideforPreparationofMetallographicSpecimensE384TestMethodforKnoopandVickersHardnessofMaterialsF835MSpecificationforAlloySteelSocketButtonandFlatCountersunkHeadCapScrews(Metric)F912MSpecificationforAlloySteelSocketSetScrews(Metric)F1789TerminologyforF16MechanicalFasteners...
