applicable

onLevel

Name

Identifier

EngineeringStandardNumber

CARBURIZEDPISTONPINS

MATERIALSSPECIFICATION

(HARDENED,SURFACE)

71233

Page1of4

000022021-019

Engineering

Standards

CUMMINSCONFIDENTIAL

Thisdocument(andtheinformationshownthereon)isCONFIDENTIALANDPROPRIETARYandshallnotbedisclodtoothersinhardcopy

orelectronicform,reproducedbyanymeans,orudforanypurpowithoutwrittenconntofCumminsInc.

Thisspecificationestablishesrequirementsforalloysteelwhichhasbeencarburized,hardened,

andtempered.

Thisspecificationisintendedforcarburizedpistonpins.

ableDocuments

Applicabledocumentslistedbelowmaybeobtainedfromtherespectiveorganizationslistedin

CES10054,StandardsOrganizationsAddress.

246,LimitsofCarbidesinCarburizedCas

18,RockwellHardnessandRockwellSuperficialHardnessofMetallicMaterials

140,StandardHardnessConversionTablesforMetalsRelationshipAmong

BrinellHardness,VickersHardness,RockwellHardness,SuperficialHardness,Knoop

Hardness,andScleroscopeHardness

350,ChemicalAnalysisofCarbonSteel,Low-AlloySteel,SiliconElectrical

Steel,IngotIron,andWroughtIron

384,MicroindentationHardnessofMaterials

487,MeasurementofMetalandMetalOxideCoatingThicknessby

MicrosopicalExaminationofaCrossSection

562,DeterminingVolumeFractionbySystematicManualPointCount

975,X-RayDeterminationofRetainedAusteniteinSteelwithNearRandom

CrystallographicOrientation

1077,EstimatingtheDepthofDecarburizationofSteelSpecimens

10054,StandardsOrganizationsAddress

10056,Glossary

16019,MethodsofMeasuringCaDepth

60002,PriorAusteniticGrainSize

tions

TermsudinthisstandardthathaveageneraldefinitionforusageinCumminsEngineering

StandardsaredefinedinCES10056,Glossary.

onLevel

Name

Identifier

EngineeringStandardNumber

CARBURIZEDPISTONPINS

MATERIALSSPECIFICATION

(HARDENED,SURFACE)

71233

Page2of4

000022021-019

Engineering

Standards

CUMMINSCONFIDENTIAL

Thisdocument(andtheinformationshownthereon)isCONFIDENTIALANDPROPRIETARYandshallnotbedisclodtoothersinhardcopy

orelectronicform,reproducedbyanymeans,orudforanypurpowithoutwrittenconntofCumminsInc.

teDecarburization

Lossofcarboncontentatthesurfaceofasteelspecimentoalevelbelowthesolubilitylimitof

carboninferritesothatonlyferriteisprent.(FromASTME1077)

lDecarburization

Lossofcarboncontentatthesurfaceofasteelspecimentoalevellessthanthebulkcarboncontent

oftheunaffectedinteriorbutgreaterthantheroomtemperaturesolubilitylimitofcarboninferrite.

(FromASTME1077)

tinuousCompleteDecarburization

Lossofcarboncontentatornearthesurfaceofasteelspecimenpredominantlymanifestedalong

sofcarbonistoalevelbelowthesolubilitylimitinferrite

nwhichiscompletelyferriticmaybeadjacenttomaterial

whichispartiallydecarburizedatthesameperpendiculardistancefromthesurface.

aDepth

Minimumperpendiculardistancefromthesurfacewherethemicrohardnessiquivalentto

46HRC.

ication

icanceandU

ecificationestablishesrequirementsforalloysteelwhichhasbeencarburized,

hardened,ultingcawillhavehighhardness.

ecificationisintendedforcarburizedpistonpins.

erialisnormallyroughmachinedandcleanedpriortocarburizing,hardening,

andtempering.

requiredwhilethepartsarebeingheattreatedtopreventunnecessarydecarburizationand

oxidationofthepriorausteniticgrainboundaries.

onLevel

Name

Identifier

EngineeringStandardNumber

CARBURIZEDPISTONPINS

MATERIALSSPECIFICATION

(HARDENED,SURFACE)

71233

Page3of4

000022021-019

Engineering

Standards

CUMMINSCONFIDENTIAL

Thisdocument(andtheinformationshownthereon)isCONFIDENTIALANDPROPRIETARYandshallnotbedisclodtoothersinhardcopy

orelectronicform,reproducedbyanymeans,orudforanypurpowithoutwrittenconntofCumminsInc.

alComposition

facecarbonofthecarburizedcashallbe0.70-0.90weightpercentwhen

measuredinaccordancewithASTME350.

alProperties

Therearenophysicalpropertyrequirements.

icalProperties

ssshallbemeasuredinaccordancewithASTME18.

ehardnessshallbe56-62HRCor88.3-91.1HR15Norequivalentinaccordance

withASTME140.

rdnessshallbe25-46HRC.

ure

tructureshallbeevaluatedataminimummagnificationof500Xunless

otherwiindicated.

burizedcamicrostructureshallconsistoffinetemperedmartensitewhen

evaluatedinaccordancewithCES60002.

pthshallbeevaluatedinaccordancewithCES16019,

specificationusingmicrohardnessmeasurementsinaccordancewithASTME384.

ivecadepthshallbe0.028inch(0.71mm)minimum.

adepthshallbe0.070inch(1.78mm)maximum.

iscontinuouscarbidesareacceptablewhenevaluatedinaccordancewith

AGMA246.

urizationshallbeevaluatedinaccordancewithASTME1077.

tedecarburizationisnotacceptable.

onLevel

Name

Identifier

EngineeringStandardNumber

CARBURIZEDPISTONPINS

MATERIALSSPECIFICATION

(HARDENED,SURFACE)

71233

Page4of4

000022021-019

Engineering

Standards

CUMMINSCONFIDENTIAL

Thisdocument(andtheinformationshownthereon)isCONFIDENTIALANDPROPRIETARYandshallnotbedisclodtoothersinhardcopy

orelectronicform,reproducedbyanymeans,orudforanypurpowithoutwrittenconntofCumminsInc.

tinuouscompletedecarburizationshallnotexceed0.0005inch(0.013mm).

ritecontenttothedepthofdiscontinuouscompletedecarburizationshallnot

exceed25percentwhenmeasuredinaccordancewithASTME562.

ldecarburizationisallowedtoamaximumdepthof0.001inch(0.0254mm)

providedthehardnesspropertiesarestillwithinlimitsofacceptability.

edausteniteinthecashallnotexceed10percentwhenmeasuredin

accordancewithASTME975.

ranularoxidationshallnotexceed0.001inch(0.0254mm)whenevaluatedon

anunetchedspecimeninaccordancewithASTMB487.

crostructuremaycontainferriteandpearliteand/ormartensiteand/orother

transformationproducts.

usteniticgrainsizeshallbe5orfinerwhenmeasuredinaccordancewith

CES60002.

onalRequirements

Therearenoadditionalrequirementsforthisspecification.