d2_data_sheet

MATERIALIZING VISIONS

Bohler-Uddeholm D2COLD WORK TOOL STEEL

GeneralBohler-Uddeholm D2 is a high-carbon, high-chromium tool steel alloyed with molybdenum and vanadium characterized by:• Highabrasivewearresistance• Highcompressivestrength• Goodthrough-hardeningproperties• Highstabilityinhardening• Goodresistancetotempering-back

Typicalanalysis %

C1.55

Si0.3

Mn0.4

Cr11.3

Mo0.8

V0.8

Standardspecification

AISI D2, W.-Nr. 1.2379

Deliverycondition

Softannealedtoapprox.210HB

Color code Yellow/White

This grade has been manufactured to our internal specificationguidelines.

ApplicationsBohler-Uddeholm D2 is recommended for tools requiring very high abrasive wear resistance, combined with moderate toughness(shock-resistance).Bohler-UddeholmD2canbesupplied in various finishes, including the hot-rolled, pre-machinedandfinemachinedcondition.

CUTTING

Materialthicknessmm

HardnessHRC

<180 HRC

>180 HRC

Tools for:Blanking,punching,piercing,cropping,shearing, trimming, clipping

upto1/8”(3mm)1/8”–1/4”(3–6mm)

60–6258–60

58–6054–56

Short,coldshears.Shreddingknivesforwasteplastics.GranulatorknivesCircular shearsClipping,trimmingtools Hotfor forgings ColdWood milling cutters, reamers, broaches

56–60

58–6058–6056–5858–60

FORMING

HardnessHRC

Tools for:Bending,forming,deep-drawing,rim-rolling,spinningandflow-forming

56–62

Coining dies 56–60

Coldextrusiondies,punches 58–60

Tube-andsectionformingrolls;plainrolls 56–60

Dies for molding of:Ceramics,bricks,tiles,grindingwheels,tablets,abrasiveplastics

58–62

Thread-rolling dies 58–62

Cold-heading tools 56–60

Crushing hammers 56–60

Swaging tools 56–60

Gauges, measuring tools, guide rails, bushes, sleeves,knurlingtools,sandblastnozzles

58–62

Bohler-Uddeholm D2

2

PropertiesPHYSICALDATA

Hardened and tempered to 62 HRC. Data at roomtemperatureandelevatedtemperatures.

Temperature 68°F(20°C)

390°F(200°C)

750°F(400°C)

Densitylbs/in3

kg/m3

0.2777,700

0.2767,650

0.2757,600

Modulus of elasticityksiMPa

30,450210,000

29,000200,000

26,100180,000

Coefficientofthermalexpansionlowtemperaturetemperingper°Ffrom68°Fper°Cfrom20°C

hightemperaturetemperingper°Ffrom68°Fper°Cfrom20°C

––

––

6.8x10–6

12.3x10–6

6.2x10–6

11.2x10–6

––

6.7x10–6

12x10–6

Thermal conductivityBtu in/(ft2h°F)W/m°C

13920.0

14621.00

15923.00

SpecificheatBtu/lb°FJ/kg°C

0.11460

––

––

COMPRESSIVESTRENGTH

Approximatevalues.

Hardness Compressiveyieldstrength,Rc0.2

MPa ksi

62HRC 2,200 319

60HRC 2,150 312

55HRC 1,900 276

50HRC 1,650 239

HeattreatmentSOFT ANNEALING

Protect the steel and heat through to 1560°F (850°C).Thencoolinthefurnaceat20°F(10°C)perhourto1200°F(650°C),thenfreelyinair.

STRESS RELIEVING

After rough machining the tool should be heated through to 1200°F(650°C),holdingtime2hours.Coolslowlyto930°F(500°C),thenfreelyinair.

HARDENING

Preheating temperature: 1110–1290°F (650–750°C).Austenitizingtemperature:1810–1920°F(990–1050°C),butusually1830–1905°F(1000–1040°C).

Temperature Soaking*time min.

Hardnessbeforetempering

°F °C

1,815 990 60 approx.63HRC

1,850 1010 45 approx.64HRC

1,885 1030 30 approx.65HRC

*Soakingtime=timeathardeningtemperatureafterthetoolisfullyheated through.

Protectthepartagainstdecarburizationandoxidationduringhardening.

QUENCHINGMEDIA

• Oil(Onlyverysimplegeometries)• Vacuum(highspeedgas)• Forcedair/gas• Martemperingbathorfluidizedbedat360–930°F(180–500°C),thencoolinginair.

Note:Temperthetoolassoonasitstemperaturereaches120–160°F(50–70°C).Bohler-UddeholmD2typicallyhardensthroughin most standard sizes.

Bohler-Uddeholm D2

3

Bohler-Uddeholm D2

4

Hardnessasafunctionofaustenitizingtemperature

TEMPERING

Choose the tempering temperature according to thehardness required by reference to the tempering graph.Tempertwicewithintermediatecoolingtoroomtemperature.Lowesttemperingtemperature360°F(250°C).Holdingtimeattemperatureminimum2hours.

DIMENSIONALCHANGESDURINGHARDENING

Heattreatment:Austenitizingtemperature1870°F(1020°C),30minutes,coolinginvacuumequipmentwith2barnitrogenoverpressure.

DIMENSIONALCHANGESDURINGTEMPERING

Note:Thedimensionalchangesonhardeningandtemperingshouldbe added together. The minimum recommended machining allow-ance is 0.15%per side assuming that stress relief is performedbetweenroughandsemifinishmachining,asrecommended.Ifnot,machining allowances must be increased accordingly.

Bohler-Uddeholm D2

5

SUB-ZERO TREATMENT

Pieces requiringmaximumdimensional stability shouldbesub-zero treated, as volume changes may occur over the courseoftime.Thisapplies,forexample,tomeasuringtoolssuchasgaugesandcertainstructuralcomponents.

Immediatelyafterquenching,thepieceshouldbesub-zerotreatedtobetween–95to–110°F(–70and–80°C)soakingtime3–4hoursfollowedbytempering.Sub-zerotreatmentwill give a hardness increase of 1–3HRC.Avoid intricateshapesastherewillberiskofcracking

NITRIDING

Nitriding will give a hard surface layer which is very resistant to wear and erosion, and also increases corrosion resistance. Atemperatureof975°F(525°C)givesasurfacehardnessofapprox.1250HV1.

Nitriding temperature

Nitriding time Depthofcase,approx.

°F °C hours in. mm

975 525 20 0.010 0.25

975 525 30 0.012 0.30

975 525 60 0.014 0.35

Nitrocarburizingat1060°F(570°C)for2hoursgivesasur-facehardnessofapprox.950HV1.Thecorrespondingcasedepthwillbe0.0004”–0.0008”(10–20µm).

Bohler-Uddeholm D2

6

MachiningThe cutting data below are to be considered as guiding valueswhichmustbeadaptedtoexistinglocalconditions.

TURNING

Cutting data parameters

Turning with carbide

Turningwith high

speedsteel

Roughturning

Fineturning

Fineturning

Cuttingspeed(vc)f.p.m.m/min

328–492100–150

492–200150–200

40–5012–15

Feed(f)i.p.r.mm/r

0.008–0.0160.2–0.4

0.002–0.0080.05–0.2

0.002–0.0120.05–0.3

Depthofcut(ap)inchmm

0.08–0.202–6

–0.08–2

–0.08–2

Carbide designationUSISO

C2K15–K20*

C2K15–K20*

––

*Use awear resistantAl2O3 coated carbide grade, for exampleSandvikCoromantGC4015orSecoTP100.

MILLING

Face and square shoulder milling


Milling with carbide Millingwith high

speedsteelFine milling

Rough milling

Fine milling


330-400100–120

655–785200–240

4514

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


C2K15*

C2K15*

*Use awear resistantAl2O3 coated carbide grade, for exampleSandvikCoromantGC3015orSecoT15M.

End milling


Typeofmilling

Solidecarbide

Carbideindexable

insert

Highspeedsteel

Cutting speed(vc)f.p.m.m/min

230–32870–100

262–36080–130

401)

12–171)

Feed (fz)inch/toothmm/tooth

0.001–0.0082)

0.03–0.202)0.003–0.0082)

0.08–0.202)0.002–0.0142)

0.05–0.352)


C2K20

C2K15-K203)

––

1)ForcoatedHSSendmillvc≈56f.p.m.(17m/min.)2)Dependingonradialdepthofcutandcutterdiameter.3)UseaAl2O3 coated carbide grade.

Bohler-Uddeholm D2

7

DRILLING

Highspeedsteeltwistdrill

Drill diameter Cuttingspeed(vc) Feed(f)

inch mm f.p.m. m/min i.p.r. mm/r

–3/16 –5 30* 10* 0.002–0.006 0.05–0.15

3/16–3/8 5–10 30* 10* 0.006–0.008 0.15–0.20

3/8–5/8 10–15 30* 10* 0.008–0.010 0.20–0.25

5/8–3/4 15–20 30* 10* 0.010–0.014 0.25–0.35*ForcoatedHSSdrillvc59-66f.p.m.(12m/min.)

Carbide drill


Typeofdrill

Indexableindex

Solidcarbide

Brazedcarbide1)


426–495130–150

230–29570–90

115–14835–45

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)Drillwithinternalcoolingchannelsandbrazedcarbidetip.2)Feedratefordrilldiameter0.8”–1.6”(20–40mm)3)Feedratefordrilldiameter0.2”–0.8”(5–20mm)4)Feedratefordrilldiameter0.4”–0.8”(10–20mm)

GRINDING

General grinding wheel recommendations for Bohler-Uddeholm D2 is given below.

Wheel selection

Typeofgrinding Wheel recommendation

Soft annealed condition

Hardenedcondition

Face grinding straight wheel

A46HV B151 R75 B31)

3SG46HVS2)

Face grinding segments

A 24 GV 3SG36HVS2)

A36GV

Cylindrical grinding A46KV B126R75B31)

3SG60KVS2)

A60KV

Internal grinding A46JV B126R75B31)

3SG60JVS2)

A60HV

Profilegrinding A 100 LV B126R100B61)

5SG 80 KVS2)

A 120 JV

Electrical-dischargemachining–EDMIfEDMisperformedinthehardenedandtemperedcondition,the hard brittle white layer must be completely removedthroughstoningandpolishingoperationsandthetoolshouldthen be given an additional temper at appr. 50°F (25°C)below the highest tempering temperature used during theheattreatmentprocess.

8

Bohler-Uddeholm D2

WeldingGoodresultswhenweldingtoolsteelcanbeachievedifproperprecautionsaretakenduringwelding(i.e.,elevatedworkingtemperature, jointpreparation,choiceofconsumablesandweldingprocedure).Ifthetoolistobepolishedortextured,it isnecessary toworkwithanelectrode typeofmatchingcomposition.

Welding method

Workingtemperature

Consumables Hardnessafter welding

MMA(SMAW)

390–480°F200–250°C

Inconel625-typeUTP67SCastolin

EutecTrode 2Castolin

EutecTrode6

280HB55–58HRC

56-60HRC

59-61HRC

TIG(GTAW)

390–480°F200–250°C

Inconel625-type

UTPA 73G2UTPA67SUTPA696CastoTig45303W

280HB53–56HRC55–58HRC60–64HRC

60-64HRC

BOHLER-UDDEHOLMCORPORATION2505MillenniumDrive,Elgin,IL60124www.bucorp.com|1-800-638-2520|[email protected] Steel Store 1-877-783-3555

Thisinformationisbasedonourpresentstateofknowledgeandisintendedtoprovidegeneralnotesonourproductsandtheiruses.Itshouldnotthereforebeconstruedasawarrantyofspecificpropertiesoftheproductsdescribedorawarrantyforfitnessforaparticularpurpose.ThelatestrevisededitionofthisbrochureistheEnglishversion,whichisalwayspublishedonourwebsitewww.bucorp.comEdition1,06.2013

d2_data_sheet

Documents