DZ/T 0198.4-1997 地质仪器工艺管理导则 工艺方案设计

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【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】:

标准名称：	ＭＪ螺纹十字槽１００°沉头螺栓
中标分类：	机械 >> 通用零部件 >> 紧固件
替代情况：	被GJB 3374-1998代替
发布日期：	1996-09-13
实施日期：	1997-01-01
首发日期：	1900-01-01
作废日期：	1900-01-01
出版日期：	1900-01-01
页数：	3页

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