OptimMCstructuralsteelExtra high strength Optim MC structural steelgrades offer excellent bendability, weldability and cutting properties.Lightenedstructuresmean increasedpayloads formachinesandequipment, reduced fuel consumption, environmentallysound construction and sustainable development. Surface quality and dimensional and geometrical accuracy areguaranteed.

OptimMCisathermomechanicallyrolled(M),coldformable(C)structuralsteelwhichmeetsandexceedstherequirementsofEN101492.

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Applications:

Framestructuresformobilevehicles

Superstructuresofcommercialvehicles

Framesandboomsforforestryvehicles

Cranearmsandotherliftingequipment

Loadhandlingequipment

Masts

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Dimensions

Cutlengthswithmilledges

RuukkiOptim Thicknessmm Widthmm1) Lengthm1)

Optim500MC 2.012 10001800 213

Optim550MC 2.210 10001640 213

Optim600MC 2.210 10001640 213

Optim650MC 2.510 10001640 213

Optim700MC 3.010 10001550 213

Optim700MCPlus 3.012 10001525 2121)Exactmaximumwidthandlengthdependonthethickness.

Moreover,OptimMCsteelsarealsoavailableascoilsandslitstrips.Pickledproductsareavailableonalimiteddimensionalrange.

Tolerances

Tolerancesondimensionsandshapes

Thedimensionandshapetolerancesconformwith,andinpartexceed,EN10051requirements.Flatnessofcutlengthsis3mm/m.OptimMCcutlengthsaredeliveredwiththeDeadFlatguarantee.

Surfacequality

Cutlengths,coilsandslitstripsareavailableinasrolledorpickledcondition.Somedimensionallimitationsexistforpickledproducts.

Properties

Mechanicalproperties:tensiletest

OptimMCsteels.Tensiletest,longitudinaltesting

Steelgrade Thicknessmm Yieldstrength Tensilestrength Elongation%Minimum

RuukkiOptim ReHorRp0,2MPaMinimum

RmMPa A801) A

Optim500MC 212 500 550700 14 18

Optim550MC 2.210 550 600760 13 17

Optim600MC 2.210 600 650820 12 16

Optim650MC 2.510 6502) 700880 12 14

Optim700MC 310 7002) 750950 NA 13

Optim700MCPlus 312 7002) 750950 NA 13

Yieldandtensilestrengtharetestedlongitudinallytotherollingdirection,andguaranteedbothinthelongitudinalandtransversedirections.1)ElongationA80isusedforthicknessbelow3mm.2)Forthickness>8mm,theminimumyieldstrengthcanbe20MPalower,accordingtoEN101492.

Mechanicalproperties:impactstrengthtest

OptimMCsteels.Impactstrength,longitudinaltesting

OptimMCstructuralsteel

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RuukkiOptim Testtemperature,Energylevel Testtemperature,Energylevel

500/550/600/650MC 20C40Jminimum 40C27Jminimum

700MC1) 20C40Jminimum 40C27Jminimum

700MCPlus2) 60C40Jminimum NA

The requirement value 40 J means tests carried out with 10 x 10 longitudinal standard test pieces. When testingthicknesseslessthan10mm,thewidthofthetestpiecescorrespondswiththestripthicknessandtherequirementvaluesdecreaseindirectrelationtothesurfaceareaofthetestpiece.Noimpacttestsarecarriedoutforthicknesseslessthan6mm.1)Ifagreeduponseparately,Optim700MCcanalsobedeliveredwithguaranteedimpactstrengthCharpyV29Jatthetemperatureof40C.2)Optim700MCPlus:Impactstrengthisguaranteedinthetransversedirectionalso.

Chemicalcomposition

Content%(ladleanalysis)

RuukkiOptim CMaximum

SiMaximum

MnMaximum

PMaximum

SMaximum

AlMinimum

Optim500MC 0.10 0.20 1.50 0.020 0.010 0.015

Optim550MC 0.10 0.20 1.70 0.020 0.010 0.015

Optim600MC 0.10 0.20 1.90 0.020 0.010 0.015

Optim650MC 0.10 0.20 2.00 0.020 0.010 0.015

Optim700MC 0.10 0.20 2.10 0.020 0.010 0.015

Optim700MCPlus 0.10 0.25 2.10 0.020 0.010 0.015

Inaddition,niobium(Nb),vanadium(V),titanium(Ti),boron(B),molybdenum(Mo),nickel(Ni)orcopper(Cu)maybeusedasalloyingelementseithersinglyorincombination.

Carbonequivalentvalues(CEV)

CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15

RuukkiOptim CEVAverage CEVMaximum

Optim500MC 0.32 0.36

Optim550MC 0.33 0.38

Optim600MC 0.34 0.41

Optim650MC 0.35 0.41

Optim700MC 0.37 0.41

Optim700MCPlus1) 0.37 0.40

Optim700MCPlus2) 0.40 0.44

1)Inthethicknessrangeof310mmCEVaverageis0.37andmaximumis0.40.2)Inthethicknessrangeof(10)12mmCEVaverageis0.40andmaximumis0.44.

Prefabricationservices

Wideflats

Wide flatsarecomponentswhichare ready forassembly.Theyaredimensionallyaccuratespeedingup themanufactureandassemblyofsteelstructuresand,avoidingwastingmaterial.Thankstotheextensiverangeavailable,steelgradesbestsuitedfortheapplicationinquestioncanbeused.

OptimMCstructuralsteel

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Precisioncutlengths

Precisioncutlengthswithabevellededgearecomponentsthatcanbedelivereddirectlytotheinstallationsite,whichsavestimeandreducestransportandstoragecosts.Thedimensionallyaccurategrooveensuresuninterruptedautomatedweldingandfitting.

Processinginstructions

Welding

Theweldabilityisexcellentandallthecommonweldingprocessescanbeused.Preheatingisnotnecessaryundernormalconditions.Anarrowheataffectedzone(HAZ)withasomewhatlowerstrengthisformedimmediatelyadjacenttotheweld.Thesofteningtendencycanbelimitedbyavoidingunnecessarilyhighheatinputduringwelding.Inapplicationswherehighstrength is required, the welded joints should be placed in the less stressed locations. So, the effect of welds on thestructure will be minimised. Matching welding materials are recommended when high strength of the weld is needed.Alternatively,undermatchingconsumablesmaybeusediftheweldislocatedinalessstressedpartofthestructure.

Cutting

OptimMCsteelscanbecuteasilybyusingthermalmethodssuchasflame,plasmaandlasercutting.Mechanicalcuttingcanalsobeapplied,butattentionmustbepaidtothestiffnessoftheequipment,bladeconditionandclearance,andsupportoftheworkpiece.

Bending

OptimMC.Minimumpermissiblebendradius,bendangle90,inalldirections

RuukkiOptim Thickness(mm)

t3 3

Order&delivery

Inspectiondocument

InspectiondocumentsareinaccordancewithEN102043.1.

Generaldeliveryinformationforhotrolledsteels

GeneraldeliveryinformationforhotrolledsteelscanbefoundfromdocumentsMarkingsandpackingandGeneraltermsofsale.

Thecontentofthisdocumenthasbeencreatedfromwebpagelastupdated18Sep2014Oursalesandtechnicalsupportarehappytogiveyoumoreinformation.Visitwww.ruukki.com/contactus.

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