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AISI 4140 Alloy Steel (UNS G41400)

AISI4140AlloySteel(UNSG41400) Sep132012

WrittenbyAZoM

Thisarticlewasupdatedon18thDecember2019

ImageCredits:PhonlamaiPhoto/shutterstock.com AlloysteelsaredesignatedbyAISIfourdigitnumbersandcomprisedifferent kindsofsteels,eachwithacompositionwhichexceedsthelimitationsofB,C,Mn, Mo,Ni,Si,Cr,andVasetforcarbonsteels. AISI4140alloysteelisachromium,molybdenum,andmanganesecontaininglowalloy steel.Ithashighfatiguestrength,abrasionandimpactresistance,toughness,and torsionalstrength.ThefollowingdatasheetgivesanoverviewofAISI4140alloysteel.

ChemicalComposition ThefollowingtableshowsthechemicalcompositionofAISI4140alloysteel.

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AISI 4140 Alloy Steel (UNS G41400)

Element

Content(%)

Chromium,Cr

0.801.10

Manganese,Mn

0.751.0

Carbon,C

0.3800.430

Silicon,Si Molybdenum,Mo

0.150.30 0.150.25

Sulfur,S

0.040

Phosphorous,P

0.035

Iron,Fe

Balance

PhysicalProperties ThephysicalpropertiesofAISI4140alloysteelarehighlightedinthefollowingtable. Properties Density Meltingpoint

Metric

Imperial 3

7.85g/cm 1416°C

0.284lb/in³ 2580°F

MechanicalProperties ThefollowingtableoutlinesthemechanicalpropertiesofAISI4140alloysteel. Properties Tensilestrength Yieldstrength Bulkmodulus(typicalforsteel) Shearmodulus(typicalforsteel) Elasticmodulus

Metric Imperial 655 MPa 415 MPa 140 GPa

Elongationatbreak(in50mm)

60200psi 20300ksi

80GPa 11600ksi 190 210 GPa

Poisson'sratio

95000psi

0.27 0.30

27557 30458ksi 0.270.30

25.70% 25.70%

Hardness,Brinell

197

197

Hardness,Knoop(convertedfromBrinellhardness)

219

219

Hardness,RockwellB(convertedfromBrinellhardness) Hardness,RockwellC(convertedfromBrinellhardness.Valuebelow

92

92

13

13

normalHRCrange,forcomparisonpurposesonly) Saved from URL: https://www.azom.com/article.aspx?ArticleID=6769

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AISI 4140 Alloy Steel (UNS G41400)

Hardness,Vickers(convertedfromBrinellhardness) Machinability(basedonAISI1212as100machinability)

207

207

65

65

ThermalProperties ThethermalpropertiesofAISI4140alloysteelaregiveninthefollowingtable. Properties Thermalexpansioncoefficient(@0100°C/32212°F) Thermalconductivity(@100°C)

Metric

Imperial

12.2µm/m°C

6.78µin/in°F

42.6W/mK 296BTUin/hr.ft².°F

OtherDesignations OtherdesignationsequivalenttoAISI4140alloysteelarelistedinthefollowingtable. AMS6349

ASTMA193(B7,B7M)

ASTMA506(4140)

ASTMA752(4140)

AMS6381

ASTMA194(7,7M)

ASTMA513

ASTMA829

AMS6382 AMS6390

ASTMA29(4140) ASTMA320(L7,L7M,L7D)

ASTMA513(4140) ASTMA519(4140)

SAEJ1397(4140) SAEJ404(4140)

AMS6395

ASTMA322(4140)

ASTMA646(4140)

SAEJ412(4140)

AMS6529

ASTMA331(4140)

ASTMA711

FabricationandHeatTreatment Machinability AISI4140alloysteelhasgoodmachinabilityintheannealedcondition.

Forming AISI4140alloysteelhashighductility.Itcanbeformedusingconventionaltechniquesin theannealedcondition.Itrequiresmorepressureorforceforformingbecauseitis tougherthanplaincarbonsteels.

Welding AISI4140alloysteelcanbeweldedusingallconventionaltechniques.However,the mechanicalpropertiesofthissteelwillbeaffectedifitisweldedintheheattreated condition,andpostweldheattreatmentshouldbeperformed.

HeatTreatment AISI4140alloysteelisheatedat845°C(1550°F)followedbyquenchinginoil.Before hardening,itcanbenormalizedbyheatingitat913°C(1675°F)foralongperiodoftime, followedbyaircooling. Saved from URL: https://www.azom.com/article.aspx?ArticleID=6769

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AISI 4140 Alloy Steel (UNS G41400)

Forging AISI4140alloysteelisforgedat926to1205°C(1700to2200°F)

HotWorking AISI4140alloysteelcanbehotworkedat816to1038°C(1500to1900°F)

ColdWorking AISI4140alloysteelcanbecoldworkedusingconventionalmethodsintheannealed condition.

Annealing AISI4140alloysteelisannealedat872°C(1600°F)followedbyslowlycoolinginthe furnace.

Tempering AISI4140alloysteelcanbetemperedat205to649°C(400to1200°F)dependingupon thedesiredhardnesslevel.Thehardnessofthesteelcanbeincreasedifithasalower temperingtemperature.Forexample,atensilestrengthof225ksicanbeachievedby temperingat316°C(600°F),andtensilestrengthof130ksicanbeachievedby temperingat538°C(1000°F).

Hardening AISI4140alloysteelcanbehardenedbycoldworking,orheatingandquenching.

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