基本信息
| 标准名称： | 珠宝玉石鉴定拉曼光谱法 |
| 发布日期： | 2008-01-16 |
| 实施日期： | 2008-05-01 |
| 首发日期： | |
| 作废日期： | |
| 主管部门： | 云南省质量技术监督局 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2008-05-01 |
适用范围
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前言
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目录
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引用标准
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所属分类： 农业 林业 畜牧 养蜂 养蚕 农业 农业和林业 农业和林业综合
【英文标准名称】:StandardPracticeforSteelCastings,Stainless,InstrumentCalibration,forEstimatingFerriteContent
【原文标准名称】:估算铁素体含量用仪器校准不锈钢铸件标准规程
【标准号】:ASTMA799/A799M-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:A01.18
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:校正;铁酸盐;不锈钢铸件;金属/合金分析仪器校准;铁素体含量;铁铬铸件;奥氏体不锈钢铸件规范;微观结构;钢铁外观检查
【英文主题词】:calibration;ferrite;stainlesssteelcastings;Calibration--metals/alloysanalysisinstrumentation;Ferritecontent;Iron-chromiumcastings;Austeniticstainlesssteelcastings--specifications;Microstructures;Stainlesssteelcastings;Visualexaminatio
【摘要】:Theamountofferritepresentinanausteniticstainlesssteelhasbeenshowntoinfluencethestrength,toughnessandcorrosionresistanceofthistypeofcastalloy.Theamountofferritepresenttendstocorrelatewellwiththemagneticpermeabilityofthesteel.Themethodsdescribedinthisstandardcovercalibrationpracticeforestimatingferritebythemagneticpermeabilityofthesteel.Thepracticeisinexpensivetouseoverlargeareasofthecastpartandisnon-destructive.Thispracticehasbeenusedforresearch,alloydevelopment,qualitycontrol,andmanufacturingcontrol.Manyinstrumentsareavailablehavingdifferentdesigns,anddifferentprinciplesofoperation.Whentheprobeisplacedonthematerialbeinginvestigated,aclosedmagneticcircuitisformedallowingmeasurementofthemagneticpermeability.Whencalibratedwithstandardshavingknownferritecontent,thispermeabilityindicatestheferritecontentofthematerialbeinganalyzed.Theestimatedferritecontentisreadfromacalibrateddialorfromadigital-readoutdial.Followthemanufacturer''sinstructionsforpropercalibrationoftheinstrument.Sincethispracticemeasuresmagneticattractionandnotferritedirectly,itissubjecttoallofthevariablesthataffectmagneticpermeability,suchastheshape,size,orientation,andcompositionoftheferritephase.Theseinturnareaffectedbythermalhistory.Ferritemeasurementsbymagneticmethodshavealsobeenfoundtobeaffectedbythesurfacefinishofthematerialbeinganalyzed.Magneticmethodsshouldnotbeusedforarbitrationofconflictsonferritecontentexceptwhenagreeduponbetweenmanufacturerandpurchaser.1.1Thispracticecoverstheprocedureforcalibrationofinstrumentstobeusedforestimatingtheferritecontentofthemicrostructureofcaststainlesssteelsbymagneticresponseormeasurementofpermeability.Thisprocedurecoversbothprimaryandsecondaryinstruments.1.1.1AprimaryinstrumentisonethathasbeencalibratedusingNationalInstituteofStandardsandTechnology-StandardReferenceMaterial(NIST-SRM)thicknesscoatingstandards.Itisalaboratorytooltobeusedwithtestspecimens.Someprimaryinstrumentsmaybeusedtodirectlymeasuretheferritecontentofcastings.1.1.2Asecondaryinstrumentisonethathasbeencalibratedbytheuseofsecondarystandardsthathavebeenmeasuredbyacalibratedprimaryinstrument.Secondaryinstrumentsaretobeusedtodirectlymeasuretheferritecontentofcastings.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.2.1Withinthetext,theSIunitsareshowninbrackets.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H40
【国际标准分类号】:77_140_80
【页数】:4P.;A4
【正文语种】: