中华人民共和国国家标准中华人民共和国国家标准中华人民共和国国家标准中华人民共和国国家标准NationalStandardofthePeople’sRepublicofChinaGB6479-2000neqISO9329-2：：：：1997SupersedesGB6479-1986高压化肥设备用无缝钢管高压化肥设备用无缝钢管高压化肥设备用无缝钢管高压化肥设备用无缝钢管Seamlesssteeltubesforhigh-pressureForchemicalfertilizerequipmentsApprovedbytheStateBureauofTechnicalSupervisionon2000–10-25Implementedfrom2001–09–01本英文版为内部资料，仅供参考，以中文版为准。TheChineseversionofstandardshasprecedencetotheirEnglishtranslationswhichareonlyforinternalreference.—1—GB6479–2000ForewordThisStandardisnotequivalenttoadoptISO9329–2:1997SeamlessSteelTubesforPressureVessels----DeliverySpecifications----Part2:CarbonSteelandAlloySteelofSpecifiedHighTemperaturePerformance.Thecriteriaofallowabledeviationforsize,degreeofbend,press-flatdeformationcoefficientforsteeltubesinthisStandardaremorestrictthaninternationalcriteriawhilethecriteriaofphysicalperformanceisequivalenttointernationalones.ThisStandard,comparedwithoriginaledition,hasmaderevisiontofollowingprovisions:1．Thecriteriaofallowabledeviationforsizearerevised.OriginalTable1isdeleted.ThespecificationforthesizeischangedtorefertoTable1ofGB/T17395–1998.2．Thebrandnumberof12SiMoVNbisadded.Phosphorousandsulfurcontentindifferentbrandnumbersofsteelisrevised.3．Supplementationismadetothedeliverystatusofsteeltubes.4．Theprovisionofusingleakingmagnetictestingtoreplacehydraulictestisaddedwhiletheprovisionofusingultrasonictestingtoreplacehydraulictestisdeleted.5．Thestipulationsofmakingpress-flattesttosteeltubeswithOD>400mmisdeleted.6．Therequirementsforlow-foldinspectionforsteeltubesrolledofsteelingotisaddedaswellastherequirementsforinspectionofnon-metalinclusioninsteeltubesrolledofcontinuouscastblankandsteelingot.7．Definitestipulationsaremadefortheclassofultrasonictesting.Fromthedateofimplementation,thisStandardshallsupercedeGB6479–1986SeamlessSteelTubesforChemicalFertilizerEquipment.ThisStandardisputforthbytheStateBure...
