钢铁制造过程-钢铁种类

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WestJapanWorks(Fukuyama)ContentsJFESteelCorporationCharacteristics................................................1producesvarioustypesApplication.....................................................2ofspecialsteelsheetsManufacturingprocess..................................4ApplicableStandard.......................................6underanintegratedSurfacefinishandheattreatment................6qualitycontrolsystematChemicalcomposition....................................7modernfacilitiesinEastAvailableproductsizerange.........................8JapanWorksandWestDimensionaltolerance.................................10JapanWorks.JFE’sspecialHardnessconversiontable...........................11steelproductssupportUnitmasspermm........................................11technicalinnovationandMechanicalpropertiesbyheattreatment...12Effectofchemicalelements........................13improvedproductivityatIntroductionoffunctionalproducts...........14customers,andhavewonSUPERHOT................................................14anexcellentreputationHyper-BurringHighCarbonHotforhighdimensionalRolledSteelSheet...............................15accuracy,quenchability,UFCSteel(UltraFineCarbideHighandformability.CarbonColdRolledSteelSheet)........16Non-OrientedHighCarbonColdRolledSteelSheet...............................17 Characteristics1.UniformqualityIntegratedoperationcontrolandhighlycomputerizedproductionprocessesensureahighlevelofuniformityinproductquality.2.HighdimensionalaccuracyandexcellentsurfacequalityJFE’sproductionplantsboastsomeoftheworld’smostadvancedsteelmaking,hotrolling,andcoldrollingequipment,ensuringhighdimensionalaccuracyandoutstandingsurfacequality.3.WideproductlineAwiderangeofsteelgradesandproductdimensionsareavailabletomeetdiversecustomerrequirements.4.StrictqualitycontrolandinspectionsystemAllproductscanbeusedwithconfidencethankstoscientificqualitycontrolandstricttestingandinspection.(JFE’ssteelsheetproductionsystemiscertifiedunderISO9001.)CharacteristicsEastJapanWorks(Chiba)1 ApplicationSK2~SK5SAE1065~SAE1074RazorbladesNeedlesSpringsMeasuresAutomobileclutchpartsSawsAlloytoolChainssteelsSKS5SKS51CarbontoolsteelsAlloysteelsforKnivesHandsawsmachinestructure,ToolsothersCarbonsteelsformachinestructureSCM415Needles,knivesSprocketgearsSCM435SNCM220ApplicationSAE5046AutomobilerecliningseatgearpartsApplicationDoorlockpartsAutomobileclutchcoversKnivesS35C~S55CGearsAutomobileclutchpartsChainpartsSpringsAutomobileseatbeltpartsWashersSprocketgearsAutomobileseatbeltbucklesSafetyshoesprotectorsHosebands,sheetsprings23 ManufacturingprocessBlastfurnaceConverterContinuouscasterContinuoushotrollingmillContinuouscoldrollingmillHotrolledsheetColdrolledsheetNonpickledhotrolledcoil1Pickling2Annealing1Steelmaking(Converter)2ContinuouscastingSlabManufacturingprocessCombinesFFCmilltechnologywith6Hismalldiameterrollsinthelatterstandsandtheadvancedautomaticcontrolsystem,followingcharacteristicsofproductsareThefinishingtrainshaveappliedpair-crossmill(Themostmodernachieved.millwithfreelychangeablerollgapwidthwise)andmostmodern3Hotrolling•Thintothicksizeispossibleinonerollingchancethicknesscontrolsystem.•ExcellentthicknessaccuracyFollowingcharacteristicsofproductsareachieved.•Excellentflatness•Highdimensionalaccuracy(Thicknesstoleranceof±0.080mmwithSUPERHOT)•ExcellentsurfacequalityManufacturingprocess•UniformmechanicalpropertiesNonpickled3Coldrolling(Continuous)FFCmillhotrolledcoilFinishingtrain(Pair-crossmill)Rougher4Cleaning5Annealing6Skinpassing7RecoilingPickledproduct4Pickling5AnnealingAnnealedproductColdrolledsheet4ShotblastingHotrolledcoilwithoutscaleShotblastedproductColdrolledcoil45 ApplicablestandardClassificationStandardDesignationJISG4051CarbonsteelsformachinestructuraluseS-C,S-CKJISG4103NickelchromiummolybdenumsteelsSNCMJISG4104ChromiumsteelsSCrJISG4105ChromiummolybdenumsteelsSCMManganesesteelsandmanganesechromiumSMnHotrolledsteelJISJISG4106steelsformachinestructuraluseSMnCsheetJISG4401CarbontoolsteelsSKJISG4404AlloytoolsteelsSKSJISG4801SpringsteelsSUPJISG4805HighcarbonchromiumbearingsteelsSUJSAEJISJISG3311ColdrolledspecialsteelstripS-CM,SK-MJISG4051CarbonsteelsformachinestructuraluseS-C,S-CKColdrolledsteelJIS*JISG4401CarbontoolsteelsSKsheetJISG4404AlloytoolsteelsSKSSAE*:Coldrolledsteelsheetswiththecorrespondingchemicalcompositions.SurfacefinishandheattreatmentApplicablestandard/SurfaceHotrolledsteelsheetfinishandHeattreatmentSurfaceAnnealingRemarksHotrolledcoilsareannealedwithscale.Decarburizedlayerisgeneratedatsurface.SuitableforapplicationsNonYeswhichneedsgrinding.pickledNoAshotrolledwithscale.Hardnessbecausenotannealed.Availabilityofworkingissubjecttonegotiation.Hotrolledandannealedafterdescalingatpicklingline.AttractivesurfaceandverylittledecarburizedYeslayer.PickledDescaledatpicklingline.ComparativelysoftmaterialsuitabletoapplicationswhichrequirenoworkingorwillNobeannealedbycustomers.Hotrolledandannealedafterdescalingbyshotblasting.SuitableforapplicationswhichrequireroughYesShotsurfacefinishandforthickergaugewhichcannotbepickled.blastedMechanicallydescaledbyshotblasting.Roughfinishsurfaceandhardenedsurface.SuitableforpunchNoworking.Reductivescaleisremovedbybrushafterannealing.UsefulforremovingsurfacescalefromverythickGroundYesmaterials.Detailsaresubjecttonegotiation.ColdrolledsteelsheetSurfaceAnnealingRemarksCarbonisspheroidizedbyannealingaftercoldrolling.BrightfinishatskinpassafterannealingwithbrightBrightYesfinishrolls.finishNoAscoldrolled.Suitableforapplicationswhichrequireannealingbycustomer.Brightfinishatcoldrolling.DullYesSpheroidizedbyannealingaftercoldrolling.Dullfinishbyskinpassrollingafterannealing.finishNoAscoldrolledwithdullfinishatcoldrolling.Hasadvantageoflessriskofdefectsthaninbrightfinish.6 ChemicalcompositionClassifi-DesignationCSiMnPSCuNiCrNi+CrMoVcationJISSAES20C0.18-0.230.15-0.350.30-0.60≤0.030≤0.035≤0.30≤0.20≤0.20≤0.35S30C(M)0.27-0.330.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20≤0.35S35C(M)0.32-0.380.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20≤0.35S45C(M)0.42-0.480.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20≤0.35S50C(M)0.47-0.530.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20≤0.35SAE10500.47-0.550.15-0.350.60-0.90≤0.030≤0.035S55C(M)0.52-0.580.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20≤0.35SAE10550.52-0.600.15-0.350.60-0.90≤0.030≤0.035CarbonsteelS60CM0.55-0.650.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20SAE10600.55-0.660.15-0.350.60-0.90≤0.030≤0.035S65CM0.60-0.700.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20SAE10650.59-0.700.15-0.350.60-0.90≤0.030≤0.035S70CM0.65-0.750.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20SAE10700.65-0.760.15-0.350.60-0.90≤0.030≤0.035SAE10740.69-0.800.15-0.350.50-0.80≤0.030≤0.035S75CM0.70-0.800.15-0.350.60-0.90≤0.030≤0.035≤0.30≤0.20≤0.20SAE10750.69-0.800.15-0.350.40-0.70≤0.030≤0.035SNCM2200.17-0.230.15-0.350.60-0.90≤0.030≤0.030≤0.300.40-0.700.40-0.650.15-0.30Ni-Cr-MosteelSAE86200.17-0.230.15-0.350.60-0.90≤0.035≤0.040≤0.350.40-0.700.35-0.600.15-0.25SCr4200.18-0.230.15-0.350.60-0.85≤0.030≤0.030≤0.30≤0.250.90-1.20CrsteelSAE50460.43-0.480.15-0.350.75-1.00≤0.035≤0.040≤0.35≤0.250.20-0.35SCM4150.13-0.180.15-0.350.60-0.85≤0.030≤0.030≤0.30≤0.250.90-1.200.15-0.30SCM4200.18-0.230.15-0.350.60-0.85≤0.030≤0.030≤0.30≤0.250.90-1.200.15-0.30Cr-MosteelSAE41300.27-0.340.15-0.350.35-0.60≤0.035≤0.040≤0.35≤0.250.80-1.150.15-0.25SCM4350.33-0.380.15-0.350.60-0.85≤0.030≤0.030≤0.30≤0.250.90-1.200.15-0.30ChemicalcompositionMnsteelSAE15410.36-0.450.15-0.351.30-1.65≤0.030≤0.035Mn-CrSMnC4430.40-0.460.15-0.351.35-1.65≤0.030≤0.030≤0.30≤0.250.35-0.70steelSK850.80-0.900.10-0.350.10-0.50≤0.030≤0.030≤0.25≤0.25≤0.30[SK5(M)]CarbonSK950.90-1.000.10-0.350.10-0.50≤0.030≤0.030≤0.25≤0.25≤0.30toolsteel[SK4(M)]SK1201.15-1.250.10-0.350.10-0.50≤0.030≤0.030≤0.25≤0.25≤0.30[SK2(M)]SKS50.75-0.85≤0.35≤0.50≤0.030≤0.030≤0.250.70-1.300.20-0.50AlloytoolsteelSKS510.75-0.85≤0.35≤0.50≤0.030≤0.030≤0.251.30-2.000.20-0.50SUP100.47-0.550.15-0.350.65-0.95≤0.035≤0.035≤0.300.80-1.100.15-0.25SpringsteelSAE61500.46-0.540.15-0.350.60-0.90≤0.035≤0.040≤0.35≤0.250.80-1.15≥0.15Cr-BearingSUJ20.95-1.100.15-0.35≤0.50≤0.025≤0.025≤0.25≤0.251.30-1.60steel——Reference——1.[]meanstheformerstandardsofthetoolsteels.2.(M)meanstheorderascoldrolledspecialsteelstripispossible.3.SiinSAEstandardis0.15%-0.35%ifnotspecified.4.Thestandardsnotspecifiedabove,orspecialchemicalcompositionsfreelycometonegotiation.67 AvailableproductsizerangeHotrolledsheetAvailableDiscussionNonpickled,allstandardsShotfinish,allstandards13.07.010.010.0×11506.06.0×8005.5×10008.05.05.0×1150kness(mm)kness(mm)4.04.0×1150ipthicipthicStr3.0Str3.03.0×11002.3×10502.02.02.0×11502.0×9001.61.61.6×7301.6×9501.6×7301.6×8007009001100130070090011001300Stripwidth(mm)Stripwidth(mm)Pickled,carbonsteel,alloysteelPickled,toolsteel,alloytoolsteelAvailableproductsize7.07.0range6.0×11006.06.05.05.04.5×1000kness(mm)4.0kness(mm)4.0ipthicipthicStr3.0Str3.02.02.02.0×11002.0×7302.0×10001.61.61.6×7301.6×9507009001100130070090011001300Stripwidth(mm)Stripwidth(mm)——Reference——1.Thestandardsnotspecifiedaboveandsizesoutsidetheavailableareaaresubjecttonegotiation.2.Slitwidthisalsoavailableandissubjecttonegotiation.8 ColdrolledsheetAvailableDiscussionS20C~S55C,SCM415,SCr420SAE1060~1075,SCM430•4353.03.00×10503.02.80×10502.52.52.02.01.8×1100kness(mm)kness(mm)1.51.5ipthicipthicStrStr1.01.00.80×11000.50.60×10500.50.60×10500.30.30.30×8000.30×9000.30×8000.30×9007009001100130070090011001300Stripwidth(mm)Stripwidth(mm)SK5SK4,SKS5,SKS513.03.02.52.50×10002.5range2.02.02.00×1000Availableproductsizekness(mm)kness(mm)1.51.5ipthicipthicStrStr1.01.00.50.60×10000.50.60×8500.60×10000.30.30.30×8500.30×9007009001100130070090011001300Stripwidth(mm)Stripwidth(mm)——Reference——1.Thestandardsnotspecifiedaboveandsizesoutsidetheavailableareaaresubjecttonegotiation.2.Slitwidthisalsoavailableandissubjecttonegotiation.3.Hardmaterials(Ascoldrolled)isalsoavailable.Itissubjecttonegotiation.89 DimensionaltoleranceHotrolledsteelsheetBasicstandardisJISG3193(Dimension,massandpermissiblevariationofhotrolledsteelplates,sheetsandstrip).ForSAE,ASTMisgenerallyappliedoutsideofJapanandJIS3193inJapan.Forhighthicknessaccuracy,SUPERHOTtolerancecanbeapplied(seefigure).±0.60±0.50JISG3193±0.40±0.30knesstolerance(mm)±0.20ipthicSUPERHOTStr±0.10012345678910111213Stripthickness(mm)DimensionaltoleranceColdrolledsteelsheetBasicstandardisJISG3141(Coldrolledsteelcoilsandstrips).Forhighthicknessaccuracy,JISG3311(Coldrolledspecialsteelstrip)canbeapplied.±0.20JISG3141Width≥1000mm±0.15JISG3141±0.10Width<1000mmknesstolerance(mm)ipthicJISG3311AStr±0.0500.51.01.52.02.53.0Stripthickness(mm)10 Hardnessconversiontable(SAEJ417)VickersRockwellHardnessTensileVickersRockwellHardnessTensileVickersRockwellHardnessTensileStrengthStrengthStrengthHardnessHardnessHardnessBScaleCScaleN/mm2BScaleCScaleN/mm2BScaleCScaleN/mm2HVHVHVHRBHRC（kgf/mm2）HRBHRC（kgf/mm2）HRBHRC（kgf/mm2）940−68.0−540−51.71860(190)280(103.5)27.1890(91)920−67.5−530−51.11825(186)275−26.4875(89)900−67.0−520−50.51795(183)270(102.0)25.6855(87)880−66.4−510−49.81750(179)265−24.8840(86)860−65.9−500−49.11705(174)260(101.0)24.0825(84)840−65.3−490−48.41660(169)255−23.1805(82)820−64.7−480−47.71620(165)25099.522.2795(81)800−64.0−470−46.91570(160)245−21.3780(79)780−63.3−460−46.11530(156)24098.120.3765(78)760−62.5−450−45.31495(153)23096.7(18.0)730(75)740−61.8−440−44.51460(149)22095.0(15.7)695(71)720−61.0−430−43.61410(144)21093.4(13.4)670(68)700−60.1−420−42.71370(140)20091.5(11.0)635(65)690−59.7−410−41.81330(136)19089.5(8.5)605(62)680−59.2−400−40.81290(131)18087.1(6.0)580(59)670−58.8−390−39.81240(127)17085.0(3.0)545(56)660−58.3−380(110.0)38.81205(123)16081.7(0.0)510(53)650−57.8−370−37.71170(120)15078.7−490(50)640−57.3−360(109.0)36.61130(115)14075.0−455(46)630−56.8−350−35.51095(112)13071.2−425(44)620−56.3−340(108.0)34.41070(109)12066.7−390(40)610−55.7−330−33.31035(105)11062.3−−600−55.2−320(107.0)32.21005(103)10056.2−−590−54.72055(210)310−31.0980(100)9552.0−−580−54.12020(206)300(105.5)29.8950(97)9048.0−−570−53.61985(202)295−29.2935(96)8541.0−−560−53.01950(199)290(104.5)28.5915(94)550−52.31905(194)285−27.8905(92)UnitmasspermmHardnessconversiontable/Unitweightpermm200018001600Innerdiameter:610mm1400Innerdiameter:508mm12001000Coilouterdiameter(mm)800(Specificgravity=7.85×10−6kg/mm3)600024681012141618202224Unitmasspermm1011 MechanicalpropertiesbyheattreatmentRelationbetweenhardnessandRelationbetweenstrengthandcoldreduction[C]contentsofhotrolledsteel(Material:spheroidizingannealed)Hardness(HRB)100SAE1065800Hardness100)290S50C700Tensilestrength8090S35C600500Hardness(HRB)80Tensilestrength(N/mm4000.20.40.60.802040Carboncontent(%)Coldreduction(%)Relationbetweenhardnessandquenchingcondition(As-hotrolled)RelationbetweenhardnessandRelationbetweenhardnessandquenchingtemperatureholdingtimeHoldingfor30minthenoilquenchOilquenchingfrom850°C70Specimen:2.0×40×40mmSpecimen:2.0×40×40mm70SAE1065Mechanicalproperties60S50CbyheattreatmentSAE10656050S35CS50CHardness(HRC)Hardness(HRC)50S35C40750800850900204060Quenchingtemperature(°C)Holdingtime(min)Relationbetweenhardnessandtemperingcondition(As-hotrolled)RelationbetweenhardnessandRelationbetweenhardnessandtemperingtemperaturetemperingtime70850°CTempering850°C30minT°C×30min70Tempering30min400°C×tmin60OilquenchAircoolOilquenchAircoolSpecimen:60502.0×40×40mmSpecimen:2.0×40×40mm40SAE106550S50C30SAE1065Hardness(HRC)S35CHardness(HRC)40S50C20S35CAsquenched2004006000204060Temperingtemperature(°C)Temperingtime(min)12 Relationbetweenhardnessandquenchingcondition(Coldrolledsteel)RelationbetweenhardnessandRelationbetweenhardnessandquenchingtemperatureholdingtime70SK5MS65CM7060SK5MS50CMS65CM5060S50CMHardness(HRC)Hardness(HRC)40Holdingfor30minthenoilquench50Specimen:1.2×40×40mm750800850900204060Quenchingtemperature(°C)Holdingtime(min)Relationbetweenhardnessandtemperingcondition(Coldrolledsteel)RelationbetweenhardnessandRelationbetweenhardnessandtemperingtemperaturetemperingtimeSK5M850°C60SK5M30minTemperingS65CM60400°C×tmin50S50CMOilquenchAircool4050850°CS65CMTempering3030minT°C×30minS50CMHardness(HRC)Hardness(HRC)4020AircoolOilquench10Specimen:1.2×40×40mmAsquenched2004006000204060Temperingtemperature(°C)Temperingtime(min)elementsEffectofchemicalelementsEffectofchemicalCFormssemi-stableFe3C(Cementite)carbide.StablephaseisCuImprovesquenchability.Dissolvescementiteandpromotesgraphite.Improvesquenchability,strengthandanti-abrasiongraphitization.Increasesstrengthbygeneratingprecipitatesatproperties.Ccontentof0.77%iseutectoid,0.02%-0.77%ishightemperature.Improvescorrosionresistance.hypo-eutectoidandover0.77%ishyper-eutectoid.Thestrengthofcarbonsteelisincreasedbytransformationofperlite,bainiteNiFormsstableausteniteandlowersthetransformationtomartensiteincoolingfromhightemperature.temperature.MultipleadditionwithCrandMostrengthensferriteandextremelyimproveslowtemperatureembrittlement.SiIncreasesstrengthasasolidsolutionstrengtheningelement.Promotesgraphitizationbydissolvingcementite.Promotesspheroidizationofcementiteandgraphitization.Improvesimpactvaluesinthelowtemperaturetemper-CrImprovesquenchabilityandpreventssofteningduringtemperbrittlementrangebelow300°CinthesamemannerofCr,Mobyformingsecondarycarbides.ExtremelysuppressesandV.graphitizationbyrefiningcarbideparticles.Improvescorrosionresistanceandanti-abrasionresistance.MnStabilizesausteniteandlowersthetransformationtemperature,improvingquenchability.IncreasesstrengthwithoutreducingMoFormscarbides,increasingresistancetotempersoftening.toughness.Stabilizescementiteandsuppressesgraphitization.Promotessecondaryhardening.ImprovesbrittlenessbyFixesSasMnSandtherebypreventsredbrittleness.preventingtemperembrittlement.PGenerallycontainedasanimpurity.SegregatesatgrainAlUsedasdeoxidizerinsteelmaking.CombineswithNtoformboundariesreducingimpactproperties.IncreasestemperAlNandimprovestoughnessbysuppressingabnormallybrittleness,butalsoincreasesstrength,grindabilityandenlargedausteniticgrains.corrosionresistance.NCombineswithnitridecreators.ImprovetoughnessbyrefiningSGenerallycontainedasanimpurity.Lowersductilityduringhotgrainsandpreventingabnormalcoarseningofaustenite.rolling.RedbrittlenessiscausedbyFeS.RedbrittlenessispreventedbyaddingMntoformMnS,alsoresultinginimprovedgrindability.1213 IntroductionoffunctionalproductsInadditiontoproductsspecifiedinJISandotherpublicstandards,JFESteelhasdevelopedvariousnewfunctionalproducts.Examplesareintroducedbelow.SUPERHOTJFEproduceshighqualityhotrolledspecialsteelSUPERHOT,whichischaracterizedbyexcellentthicknessaccuracy,surfacequality,andworkabilityincomparisonwithconventionalhotrolledspecialsteels,byapplyinganadvancedhotrollingmill,proprietarytechnologies,andstrictcontrols.SUPERHOTiswidelyusedinitemswhichcannotbesubstitutedwithcoldrolledproducts,suchaschainplates,seatbelttongues,reclinergears,andpoleparking.CharacteristicsExampleofthicknessmeasurementof(µm)3.2mm×930mm(S55C)1.Excellentaccuracyofthickness200LongitudinalthicknessdeviationisThicknesschart100extremelysmallandthecrownisalsoflat.Actualmeasureddataof0thicknessdeviationandprofileisshown.−1002.Excellentqualitythicksheet−200DescalingatthecoilformofthestripLongitudinaldirectionmorethan9mmispossible.(µm)203.Excellentsurfacequality0Redscaleiscontrolledinminimum.Theexampleisshownbelow.−20functionalproducts−40IntroductionofComparisonofsurfacebetween−60SUPERHOTandConventionalone−80Profilechart−100WidthwisedirectionApplicationPartsofrecliningseatConventionaloneSUPERHOT4.Excellentworkability1cmGearplateItissuitabletofineblanking,toughstandingandslightcurvaturebending.StandardExcellentthicknessaccuracyproductandexcellentsurfacequalityproductsareapplicabletoallstandards.Excellentqualitythicksheetandex-cellentworkabilityproductsaremainly1cmapplicabletoSC,SCMandSCr.Lockgear14 Hyper-BurringHighCarbonHotRolledSteelSheetHyper-Burringisahighcarbonsteelformachinestructuralusewithuniformlydispersedfinecarbides.ThisnewproductwasdevelopedbyapplyingJFE’sSuperOLACHtechnology,andprovidesextremelyhighperformanceinburring(holeexpansion),pressforming,andheattreatmentincomparisonwithconventionalhighcarbonhotrolledsteels.(SuperOLACH:SuperOn-LineAcceleratedCoolingforHotstripmill)CharacteristicsHoleexpandingratio–strength1.Holeexpandingratioistwotimeslargerbalancewithconventionalproducts.Strength/TS(N/mm2)2.Softersteelsheetcanbeproduced.40045050055060090Hyper-burringStandardanddimension%80S35CHighλ/→StandardsS30C-S45Careapplicablewithspheroidiz-70ingannealedsteelinthicknessof2.3-6.5mm.Coldrolled(Detailsaresubjecttonegotiation.)60S35CMeningratioxpandingratio50ExamplesofapplicationThickApplicabletopartswhichrequirestrength,suchasHolee40Conventional←wautomobiledrivetrain,asasubstituteforcastandhotrolledS35CLo30forgedparts.Canbeusedinsolid(unitary)parts.120130140150160170180Hardness(Hv)functionalproductsIntroductionofExampleofholeexpansion(S35C)IntroductionoffunctionalproductsConventionalHyper-BurringMicrostructureofHyper-Burring(S35C)ConventionalHyper-Burring1415 UFCSteel(UltraFineCarbideHighCarbonColdRolledSteelSheet)Properselectionofcoldrollingandannealingconditionsenablesuniformdispersionoffinespheroidizedcarbides1/10thesizeofthoseinconventionalsteel.Haswonanexcellentreputa-tionwithcustomersforimprovingefficiencyinthequenchingprocessanduniformproductquality.(UFCSteel:UltraFineCarbideSteel)Characteristics1)Possibleshorteningofheattreatmentduetoeasycarbidedissolution.2)Uniformqualityafterheattreatment.2µmfunctionalproductsIntroductionofMicrostructureofconventionalsteelMicrostructureofUFCsteelStandardApplicabletoSK4,SK5.(Otherstandardsaresubjecttonegotiation.)ExamplesforapplicationRoundsawHandysaw16 Non-OrientedHighCarbonColdRolledSteelSheetHighcarbonsteelproductswithexcellentuniformityofmechanicalpropertiesinthesheetsurfacedirection.Byproperlycontrollingthepearlitestructureduringhotrolling,thecoldreductionratio,andannealingconditions,andbybalancingfinecarbidegenerationandthespecifiedcrystalorientation,itispossibletominimizeanisotropiccharacteristics,resultinginimprovedformabilityandquenchability.Characteristics1.Becauseanisotropiccharacteristicsofmechanicalpropertiesareextremelylow,highdimensionalaccuracyisachievedinthecupcylindertest.2.Ductilityandpressformabilityareexcellent.3.Quenchabilityisalsoexcellent.StandardS35C–S55C.Otherstandardsaresubjecttonegotiation.AppearancechangeaftercupApplicationcylindertestedpiecesAxiallysymmetricalpartswhichrequirehighdimensional(mm)0°Conventional26.35steelaccuracy,suchastransmissionparts(Rotatingpart).Newly26.30developedCharacteristicsofnewlydevelopedsteelsteel26.2526.20(ExampleofS35Ccoldrolledandspheroidizing26.15annealed)26.10functionalproducts270°90°IntroductionofAppearanceofcupcylindertestedpieces180°IntroductionoffunctionalproductsChangeinwallheightandwallthick-nessaftercupcylinderdeepdrawingConventionalsteelNewlydevelopedsteel42Arrowisrollingdirection90°meansmeasuredpoints.180°0°Hardnessdistributionafterhighcurrency30mmh40270°quenchingNewlydevelopedsteel800NewlydevelopedsteelInductionCoil38allheight(mm)700WConventionalsteel60036500φ10018Conventionalsteel16Conventionalsteel400Specimen:100mmφHardness(Hv)Heatingcondition:Afterreaching1000°C14300attheoutersurface(3.4s),watercooled.(Averagecoolingspeedis582°C/s)12knessincrease(%)20010NewlyThicdevelopedsteel1008051004590135180Distancefromtheoutersurface(mm)1617 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