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ID:33284106
大小:549.50 KB
页数:39页
时间:2019-02-23
《ASTM E18-2018a andard Test Methods for Rockwell Hardness of Metallic Materials》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ThisinternationalstandardwasdevelopedinaccordancewithinternationallyrecognizedprinciplesonstandardizationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecommendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.Desi
2、gnation:E18−18aAnAmericanNationalStandardStandardTestMethodsfor1,2RockwellHardnessofMetallicMaterialsThisstandardisissuedundertheÞxeddesignationE18;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinpare
3、nthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*济南中船设备有限公司kilograms-force(kgf)andtheindenterballdiameterswerespeciÞedinunitsofinch
4、es(in.).ThisstandardspeciÞesthe1.1ThesetestmethodscoverthedeterminationoftheunitsofforceandlengthintheInternationalSystemofUnitsRockwellhardnessandtheRockwellsuperÞcialhardnessof(SI);thatis,forceinNewtons(N)andlengthinmillimetersmetallicmaterialsbytheRockwellindentationhardnessprin-
5、(mm).However,becauseofthehistoricalprecedentandciple.ThisstandardprovidestherequirementsforRockwellcontinuedcommonusage,forcevaluesinkgfunitsandballhardnessmachinesandtheproceduresforperformingRock-diametersininchunitsareprovidedforinformationandmuchwellhardnesstests.ofthediscussion
6、inthisstandardreferstotheseunits.1.2Thistestmethodincludesrequirementsfortheuseof1.6Thetestprinciples,testingprocedures,andveriÞcationportableRockwellhardnesstestingmachinesthatmeasureproceduresareessentiallyidenticalforboththeRockwellandRockwellhardnessbytheRockwellhardnesstestprin
7、cipleandRockwellsuperÞcialhardnesstests.ThesigniÞcantdifferencescanmeetalltherequirementsofthistestmethod,includingthebetweenthetwotestsarethatthetestforcesaresmallerforthedirectandindirectveriÞcationsofthetestingmachine.PortableRockwellhardnesstestingmachinesthatcannotmeetthedirect
8、RockwellsuperÞcialt
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