SN 924-4-2002 Forged rollers made of 21CrMoV511V f

November2002Forgedrollersmadeof21CrMoV511VforcontinuouscastersInstructionsfordeliveryandinspectionSN924Part4Dimensionsinmm1FieldofapplicationThesedeliveryandinspectioninstructionsapplytorollersforcontinuouscastersuptorollerdiametersof500mm.Theinstructionsserveasorderingprescriptionsandarepartoftheorder.Noteonthedrawing:MaterialsupplierhastofollowthedeliveryandinspectioninstructionsofSN924-4.2ForgingdimensionsandspecimenpositionforrollerswithnecksZD=neckdiameter(finisheddimension)RL=rollerlength(finisheddimension)D=barreldiameter(finisheddimension)BL=barrellength(finisheddimension)Fig.13ForgingdimensionsandspecimenpositionforshellrollersD=rollerdiameter(finisheddimension)RL=rollerlength(finisheddimension)Fig.2Continuedonpages2to4Bearbeitet:Normung/Standardisierung2.47.04SpecimenpositionfortestingofthemechanicalpropertiesontheforgingSpecimenpositionfortestingofthemechanicalpropertiesontheforgingNoguaranteecanbegiveninrespectofthistranslationInallcasesthelatestGerman-languageversionofthisstandardshallbetakenasauthoritativeThiscopywillnotbeupdatedincaseofchanges!Page2SN924Part4:2002-114Bar-stockdimensionsandspecimenpositionforbar-stockrollersRL=rollerlength(finisheddimension)U=overmeasure10/20mm(seeFigs.1&2)D=barreldiameter(finisheddimension)Fig.35MaterialMaterial21CrMoV511VWerkstoff-Nr.1.8070accordingtoSEW550-57Chemicalcomposition(ladleanalysis)CSiMnP+SCrMoNiVTiPercentages0,17-0,250,30-0,600,30-0,50eachmax.0,0351,20-1,501,00-1,200,600,25–0,35-YieldpointReHmin.Rp0,2min.540N/mm2TensilestrengthRm690-830N/mm2ElongationafterfractureA516%(longit.)14%(transv.)42J(axial),28J(transv.),percentagebrittlefracture70%NotchimpactenergyAVmin.(DVM)Testtemp.20°CMeanvalueoutofthreespecimens,smallestindividualvalue≥70%ofmeanvalueHardnessHV30220-265Grainsizecharacteristic≥6acc.toDIN50601Degreeofpurityacc.toDIN50602:Allnon-metallicinclusions:sizecharacteristicmax.4SpecimenmaterialfortestingthemechanicalpropertiesofbarstockSpecimenpositionfortensiletestandnotchedbarimpactbendingtestPage3SN924Part4:2002-116QualityregulationsforforgingsIfnoparticularrequirementsaremade,thetechnicalconditionsofdeliveryandqualityspecificationscanbetakenfromtherelevantDIN,DINEN,ISO,SEWstandardsorfromtheSN(SMSDemagstandards).Forginggrade≥4.Asanalternative,rolledmaterialofreductiongrade≥4canbeused.Uponforging,eachrollerisprovidedwithaconsecutivenumberenablingitsassignmenttotheheatandheattreatment;thisconsecutivenumberisgiventothefinishedrolleraccordingtothedrawing.7HeattreatmentUponpremachining,therollersarequenchedandtemperedinliquid.Individualquenchingandtemperingdoesnotapplytobarstock.Uponmachining,therollerswhoseneckshavebeenturnedfromthesolidmaterialmustbeannealedforstressrelief.Tokeepdistortionlow,therollersmustbepreferablyinverticalpositionduringtheheattreatment.8RequiredtestingTensiletestaccordingtoDINEN10002CharpyimpacttestaccordingtoDINEN10045SpecimenpositionseeFigs.1,2and3Extentoftesting:min.1tensiletestand1setofCharpyimpacttestsforeachheat,heattreatmentlotanddiameter.Incaseofmorethan20forgingbarsperheat,onesetofspecimensisrequiredinaddition.HardnesstestToproveuniformquenchingandtempering,hardnesstestingonatleast30%ofallforgingsisrequiredforeachheat-treatmentlot.ForretestingthespecificationsofDINEN10021areapplicable.Nondestructivetestingseeitem9MicrographicexaminationDeterminationofgrainsizeanddegreeofpurity9InsideandoutsidematerialconditionInsideconditionofthefinishedpart:UltrasonictestingSEP1921TestgroupSizeclassFrequencyclassSurfacezone=1/3Dmax.100mmthick3E/dOntheentireworkpieceCorezone=remainingsection3C/dOutsideconditionofthefinishedpart:DyepenetrantormagneticparticletestingOntheareasmarkedorontheworkpiece.Testinginfinishedconditiononeveryneck.CracksandlinearindicationsarenotpermittedOnthebasisoftheirtrainingandexperience,theinspectorsmustbeabletoproperlyperformthetests/inspectionsinconformitywiththespecifiedinstructions.ThequalificationoftheinspectorsmustbeaccordingtoDINEN473and,uponrequest,itmustbeproventotheordererthattheinspectorshavepassedanexamination.ExaminationsoftheAmericanSocietyofNondestructiveTesting(SNT-TC-1A)willberecognized.Page4SN924Part4:2002-1110QualitydocumentationUnlessotherwisespecifiedintheorderbySMSDemag,thequalitydocumentationmustbedrawnupinEnglishandinthenationallanguageofthemanufacturer.AlldocumentsmustbeidentifiedinsuchawaythattheycanbeassignedtotheSMSDemagorderno.,projectno.andthecomponentdesignation.AninspectioncertificateaccordingtoDINEN10204,3.1B,dulymadeoutbythemanufacturer,mustbeincludedinthesupplyandgiveatleastthefollowinginformation:-chemicalcompositionofeveryheatcontainedinthesupply-heattreatmentdatawithconsecutiverollernumberperheattreatmentunit(inhardeningandtempering)-valuesofthetensileandCharpyimpacttests-resultsofthehardnesstest-resultsofthenondestructivetests-resultsofthegrainsizedeterminationsanddegreeofpurity-resultofthedimensionalinspection