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MATERIALIZING VISIONS
Bohler-Uddeholm O1COLD WORK TOOL STEEL
GeneralBohler-Uddeholm O1 general purpose oil-hardening tool steel is a versatile manganese-chromium-tungsten steel.Its main characteristics include:
• Goodmachinability• Gooddimensionalstabilityinhardening• Agoodcombinationofhighsurfacehardnessand
toughnessafterhardeningandtempering.
These characteristics combine to give a steel suitable forthemanufactureoftoolingwithgoodtool-lifeandproductioneconomy.
Typicalanalysis%
C0.95
Mn1.1
Cr0.55
W0.55
V0.1
Standardspecification
AISI O1, W.-Nr. 1.2510
Deliverycondition
Softannealedtoapprox.190HB
Color code Yellow
This grade has been manufactured to our internalspecifications,andauditedtomeetourguidelines.
ApplicationsCUTTING
Materialthickness mm
HardnessHRC
Toolsfor:Blanking, punching, piercing, cropping, shear-ing, trimming, clipping
up to 1/8” (3 mm)1/8-1/4” (3-6 mm)
1/4-13/32” (6-10 mm)
60-6256-6054-56
Short cold shearsClippingandtrimmingtoolsforforgings Hot Cold
54-6058-6056-58
FormingBending,raising,drawing,rimrolling,spinningandflowformingSmall coining diesGauges, measuring toolsTurning centersGuidebushes,ejectorpins,highduty,small/medium drills and tapsSmallgearwheels,pistons,nozzles,cams
56-6256-60
58-62
PropertiesPHYSICALDATA
Hardened and tempered to 62 HRC. Data at roomtemperature and elevated temperatures.
Temperature 68°F(20°C)
375°F(200°C)
750°F(400°C)
Densitylbs/in3
kg/m3
0.2827,800
0.2807,750
0.2787,700
ModulusofelasticitypsiN/mm2
28x106
190,00027x106
185,00025x106
170,000
Coefficientofthermalexpansionper°Ffrom68°Fper°Cfrom20°C
––
6.5x10–6
11.7x10–6
6.3x10–6
11.4x10–6
ThermalconductivityBtuin/(ft2h°F)W/m °C
22232
22933
23634
SpecificheatBtu/lb°FJ/kg °C
0.11460
––
––
COMPRESSIVESTRENGTH
Approximatevalues.
Hardness Compressiveyieldstrength,Rc0.2
N/mm2 ksi
62HRC 2,200 319
60HRC 2,150 312
55HRC 1,800 261
50HRC 1,350 196
Bohler-Uddeholm O1
2
Heattreatment
SOFT ANNEALING
Protect the steel and heat through to 1435°F (780°C). Thencoolinthefurnaceat20°F(10°C)perhourto1200°F(650°C),thenfreelyinair
STRESS RELIEVING
Afterroughmachiningthetoolshouldbeheatedthroughto1200°F(650°C),holdingtime2hours.Coolslowlyto930°F(500°C)thenfreelyinair.
HARDENING
Preheating temperature: 1110–1290°F (600–700°C) Austenitizingtemperature:1450–1560°F(790–850°C)
Temperature Soaking*time min.
Hardnessbeforetempering
°F °C
1,470 800 30 approx.65HRC
1,520 825 20 approx.65HRC
1,560 850 15 approx.63HRC
*Soakingtime=timeathardeningtemperatureafterthetoolisfullyheated through.
Protectthepartagainstdecarburizationandoxidationduringhardening.
QUENCHINGMEDIA
• Oil• Martemperingbath.Temperature360–430°F(180–
220°C), then cooling in air.
Note: Temper the tool as soon as its temperature reaches 120–160°F (50–70°C).
Hardnessasafunctionofhardeningtemperature.
Bohler-Uddeholm O1
3
Bohler-Uddeholm O1
4
TEMPERING
Choose the tempering temperature according to the hardness requiredbyreferencetothetemperinggraph.Tempertwicewith intermediate cooling to room temperature. Lowestrecommended tempering temperature 480°F (250°C). Holdingtimeattemperatureminimum2hours.
MARTEMPERING
Tools at austenitizing temperature are immersed in themartemperingbathforthetimeindicated,thencooledinairto not lower than 210°F (100°C). Temper immediately aswithoil-quenching.
Austenizingtempera-
ture
Temp.ofmartemp. bath
Holdingtimeinmartemp.bath,
minutes
Surfacehardness priorto tempering
(obtainedbymar-tempering)
°F °C °F °C
1520 825 435 225 max.5 64±2HRC
1520 825 390 200 max.10 63±2HRC
1520 825 355 180 max.20 62±2HRC
1520 825 435 225 max.10 62±2HRC
DIMENSIONALCHANGESDURINGHARDENING
Sampleplate,4”x4”x1”,100x100x25mm.
Width%
Length%
Thickness%
Oilhardeningfrom1530°F (830°C) min.max.
+0.03+0.10
+0.04+0.10
-+0.02
Martemperingfrom1530°F (830°C)min.max.
+0.04+0.12
+0.06+0.12
-+0.02
DIMENSIONALCHANGESDURINGTEMPERING
Note: The dimensional changes on hardening and tempering shouldbeaddedtogether.Recommendedallowance0.25%.
SUB-ZERO TREATMENT
Pieces requiring maximum dimensional stability shouldbesub-zero treated,asvolumechangesmayoccur in thecourseoftime.Thisapplies,forexample,tomeasuringtoolslike gauges and certain structural components.
Sub-zerotreatment
Immediatelyafterquenching thepieceshouldbesub-zerotreatedtobetween–95to–110°F(–70and–80°C),soakingtime3–4hours,followedbytempering.Sub-zerotreatmentwill give a hardness increase of 1–3HRC.Avoid intricateshapesas therewillberiskofcracking.Alternatively,sub-zero treatment can be done between first and secondtempers.Thiswillhavelesseffect,butsaferwithrespecttorisk cracking.
Bohler-Uddeholm O1
5
MachiningThe following tables give machining data for Bohler-UddehomO1insoftannealedcondition.Hardness190HB.Thedataaretobeconsideredasguidingvalues,whichmustbeadaptedtoexistinglocalconditions.
TURNING
Cutting data parameters
Turningwithcarbide
Turningwithhigh
speed steel
Roughturning
Fineturning
Fineturning
Cutting speed (vc)f.p.m.m/min
525-690160-210
690-850210-260
65-8020-25
Feed(f)i.p.r.mm/r
0.008-0.0160.2-0.4
0.002-0.0080.05-0.2
0.002-0.010.05-0.3
Depthofcut(ap)inchmm
0.08-0.22-4
0.02-0.080.5-2
0.02-0.0100.5-2
CarbidedesignationUSISO
C6-C5P20-P30Coatedcarbide
C7P10
Coatedcarbideor
cermet
––
MILLING
Face and square shoulder milling
Cutting data parameters
Millingwithcarbide
Rough milling
Fine milling Millingwithhigh speed steel Fine
Milling
Cutting speed (vc) f.p.m.m/min
560-820170-250
820-290250-290
8025
Feed(fz) inch/toothmm/tooth
0.008-0.0160.2-0.4
0.004-0.0080.1-0.2
0.0040.1
Depthofcut(ap) inchmm
0.08-0.22-5
-0.08-2
-0.08-2
CarbidedesignationUSISO
C6-C5P20-P40Coated carbide
C7-C6P10-P20Coated
carbideorcermet
--
End milling
Cutting data parameters
Typeofmilling
Solidcarbide
Carbideindexable
insert
Highspeedsteel
Cutting speed (vc)f.p.m.m/min
490-620150-190
525-720160-220
80-1001)
25-301)
Feed(fz) inch/toothmm/tooth
0.0012-0.0082)
0.03-0.202)
0.003-0.0082)
0.08-0.202)
0.002-0.0142)
0.05-0.352)
CarbidedesignationUSISO
C2K20, P40
C6–C5P20–P30
––
1)ForcoatedHSSendmillvc~115f.p.m.(35m/min.)2)Dependingonradialdepthofcutandcutterdiameter.
Bohler-Uddeholm O1
6
DRILLING
Highspeedsteeltwistdrill
Drill diameter Cutting speed (vc) Feed(f)
inch mm f.p.m. m/min i.p.r. mm/r
-3/16 -5 50* 16* 0.003-0.008 0.08-0.20
3/16-3/8 5-10 50* 16* 0.008-0.012 0.20-0.30
3/8-5/8 10-15 50* 16* 0.012-0.014 0.30-0.35
5/8-3/4 15-20 50* 16* 0.014-0.016 0.35-0.40*)ForcoatedHSSdrillvc ~ 70 f.p.m.(22m/min.)
Carbidedrill
Cutting data parameters
Typeofdrill
Indexableinsert
Solidcarbide
Brazedcarbide1)
Cutting speed (vc) f.p.m.m/min
655-720200-220
360-460110-140
230-29570-90
Feed(f)i.p.r.mm/r
0.002-0.012)
0.05-0.252)
0.004-0.013)
0.10-0.253)
0.006-0.014)
0.15-0.254)
1)Drillwithreplaceableorbrazedcarbidetip2)Feedratefordrilldiameter0.8”–1.6”(20–40mm)3)Feedratefordrilldiameter0.2”–0.8”(5–20mm)4)Feedratefordrilldiameter0.4”–0.8”(10–20mm)
GRINDING
Generalgrindingwheelrecommendations:
Typeofgrinding Wheel recommendation
Softannealedcondition
Hardenedcondition
Face grinding straightwheel
A46HV A46HV
Face grinding segments
A 24 GV A 36 GV
Cylindricalgrinding A 46 LV A 60 KV
Internal grinding A 46 JV A 60 IV
Profilegrinding A 100 LV A 120 JV
WeldingGoodresultswhenweldingtoolsteelcanbeachievedifproperprecautionsaretakenduringwelding(i.e.,elevatedworkingtemperature, jointpreparation,choiceofconsumablesandweldingprocedure).Ifthetoolistobepolishedortextured,it isnecessary toworkwithanelectrode typeofmatchingcomposition.
Welding method
Working temperature
Consumables Hardnessafterwelding
MMA(SMAW)
390-480°F 200-250°C
AWS E312ESAB OK
84.52UTP 67SCastolin
EutecTrode 2Castolin
EutecTrode N102
300HB
53-54HRC55-58HRC54-60HRC
54-60HRC
TIG(GTAW)
390-480°F 200-250°C
AWS ER312UTPA 67S
UTPA 73G2Casto Tig45303 W
300HB55-58HRC53-56HRC
60-64HRC
Electrical-dischargemachining–EDMIfEDMisperformedinthehardenedandtemperedcondition,thetoolshouldthenbegivenstresstemperatatemperaturethat is at least 50°F (25°C) below the lowest temperingtemperature.
BOHLER-UDDEHOLMCORPORATION2505 Millennium Drive, Elgin, IL 60124www.bucorp.com|1-800-638-2520|[email protected] Steel Store 1-877-783-3555
Thisinformationisbasedonourpresentstateofknowledgeandisintendedtoprovidegeneralnotesonourproductsandtheiruses.Itshouldnotthereforebeconstruedasawarrantyofspecificpropertiesoftheproductsdescribedorawarrantyforfitnessforaparticularpurpose.ThelatestrevisededitionofthisbrochureistheEnglishversion,whichisalwayspublishedonourwebsitewww.bucorp.comEdition 1, 06.2013