Designation:B76−90(Reapproved2013)StandardTestMethodforAcceleratedLifeofNickel-ChromiumandNickel-Chromium-IronAlloysforElectricalHeating1ThisstandardisissuedunderthefixeddesignationB76;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethod2coversthedeterminationoftheresistancetooxidationofnickel-chromiumandnickel-chromium-ironelectricalheatingalloysatelevatedtempera-turesunderintermittentheating.Proceduresforaconstant-temperaturecycleareprovided.Thistestmethodisusedforinternalcomparativepurposesonly.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheet(MSDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimitationspriortouse.2.SignificanceandUse2.1Thistestmethodisusedbyproducersofelectricalheatingalloystomeasurethecyclicoxidationresistanceofthesealloys.2.2Becauseoftheeffectoftheenvironment,design,anduse,thelifevaluesobtainedfromthistestmethodmaynotcorrelatewiththatofanapplianceorindustrialheatingunit.3.TestPanel3.1SizeandLocation—ThedimensionsofthetestpanelshallbesimilartothoseshowninFig.1.Thetestpanelshallbelocatedinapositionfreefromdraftsofair.NOTE1—Theenclosureshallfittightlyonthepanelandtheglassslideshallfitsnuglytopreventleakageofairatthispointduringtheoperationofthetest,asevenaslightdraftofairincontactwiththespecimenwillcauseexcessivevariationinlengthoflife.Ascreenof40wiremesh,0.010-in.(0.025-...
