AISI O1 | Cold Work Tool Steel | Data Sheet

1 tool Steel FACTSG reat Tooling Starts Here! aisi O1 cold work tool steelAISI O12 This information is based on our present state of knowledge and isintended to provide general notes on our products and their should not therefore be construed as a warranty of specificproperties of the products described or a warranty for fitness for aparticular O13 PropertiesPHYSICAL DATAH ardened and tempered to 62 HRC. Data at ambi-ent temperature and elevated F375 F750 F(20 C)(200 C)(400 C) 800 7 7507 700 Modulus of elasticitypsi28 x 10627 x 10625 x 106N/mm2190 000185 000170 000 Coefficient of thermal F from 68 F x 10-6 x 10-6per C from 20 C x x 10-6 Thermal conductivityBtu in/ft2 h F222229236W/m C 32 33 34 Specific heatBtu/lb.

2 J/kg C460 COMPRESSIVE STRENGTHThe figures are to be considered yield strenght, HRC220031960 HRC215031255 HRC180026150 HRC1350196 GeneralAISI O1 general purpose oil-hardening tool Steel isa versatile manganese-chromium-tungsten steelsuitable for a wide variety of cold - work main characteristics include: Good machinability Good dimensional stability in hardening A good combination of high surface hardnessand toughness after hardening and characteristics combine to give a Steel suit-able for the manufacture of tooling with good tool -life and production O1 can be supplied in various finishes includ-ing hot-rolled, pre-machined, fine-machined andprecision ground.

3 It is also available in the form ofhollow % O1, annealed approx. 190 HBColor codeYellowApplicationsTools forMaterial thicknessHRCC uttingBlanking, punching up to 1/8" (3 mm)60 62piercing, cropping, 1/8 1/4" (3 6 mm)56 60shearing, trimming 1/4 13/32" (6 10 mm) 54 56clippingShort cold shears54 60 Clipping and trimming toolsHot58 60for forgingsCold56 58 FormingBending, raising, drawing, rim rolling,spinning and flow forming56 62 Small coining dies56 60 Gauges, measuring toolsTurning centresGuide bushes, ejector pins, high duty,small/medium drills and tapsSmall gear wheels, pistons, nozzles, cams58 62 Clipping and edging tool in aisi O1 tool Steel to clipand form edge of " ( mm)

4 Thick stainlesssteel container approx. 10" x 6" x 8" (254 x 152 x203 mm). aisi O14 Heat treatmentSOFT ANNEALINGP rotect the Steel and heat through to 1435 F(780 C). Then cool in the furnace at 27 F (15 C)per hour to 1200 F (650 C), then freely in rough machining the tool should be heatedthrough to 1200 F (650 C), holding time 2 slowly to 930 F (500 C) then freely in temperature: 1110 1290 F (600 700 C)Austenitizing temperature: 1450 1560 F (790 850 C)TemperatureSoaking*Hardnesstimebefore F Cminutestempering147080030approx. 65 HRC152082520approx. 65 HRC156085015approx. 63 HRC* Soaking time = time at austenitizing temperature afterthe tool is fully heated the part against decarburization and oxi-dation during MEDIA Oil Martempering bath.

5 Temperature 360 435 F(180 225 C), then cooling in : Temper the tool as soon as its temperaturereaches 120 160 F (50 70 C).6664626058565452504846444240383630282 624222018161412108642 1455 F(790 C)Hardness, RCRetained austenite %Tempering graphSurfaceHolding time hardness priorAustenitizingTemp. ofin martemp. to temperingtemperature martemp. bathbath,(obtained by F C F Cminutesmartempering)1520825435225max. 564 2 HRC1520825390200max. 1063 2 HRC1520825355180max. 2062 2 HRC1560850435225max. 1062 2 HRCTEMPERINGC hoose the tempering temperature according tothe hardness required by reference to the temper-ing graph. Temper twice with intermediate coolingto room temperature.

6 Lowest tempering tempera-ture 360 F (180 C). Holding time at temperatureminimum 2 austenite %40302010 Grain sizeHolding time 1hRetained austeniteHolding time20 minutesGrainsizeASTM10 8 6 4 21400 1435 1470 1510 1545 1580 1615 F 760 780 800820 840 860 880 C Austenitizing temperatureHardnessHRC66646260 Hardness as a function of hardening at austenitizing temperature are immersedin the martempering bath for the time indicated,then cooled in air to not lower than 210 F (100 C).Temper immediately as with austenite1560 F (850 C)Austenitizing temperature1510 F(820 C)200 400 600 800 1000 1200 F100 200 300 400 500 600 700 C Tempering temperatureAISI O15 MachiningrecommendationsThe following tables give machining data for AISIO1 in soft annealed condition.

7 Hardness 190 data are to be considered as guiding values,which must be adapted to existing local carbidewith highCutting dataspeed steelparametersRough turning Fine turningFine turningCuttingspeed (vc) 560560 73065m/min140 170170 22020 Feed (f) cut (ap) 6 2 2 Carbidedesignation USC6 C5C7 ISOP20 P30P10 CoatedCoatedcarbidecarbide orcermetDIMENSIONAL CHANGESDURING HARDENINGS ample plate, 4" x 4" x 1" (100 x 100 x 25 mm).WidthLengthThickness%%%Oil hardening from1530 F (830 C)min.+ + max.+ + + from1530 F (830 C)min.+ + max.+ + + CHANGESDURING TEMPERINGD imensional change %+ 0 400 600 F 100200300 400 CTempering temperatureMILLINGFace and square shoulder millingMilling withMillingcarbidewith highCutting dataspeed steelparametersRough milling Fine milling Fine millingCuttingspeed (vc) 530 660660 79080m/min 160 200200 24025 Feed (fz)in/tooth cut (ap) 2 5 2 2 Carbidedesignation USC6 C5C7 C6 ISOP20 P40P10 P20 CoatedCoatedcarbidecarbide orcermetNote: The dimensional changes on hardening andtempering should be added together.

8 Recom-mended allowance %.SUB-ZERO TREATMENT AND AGINGP ieces requiring maximum dimensional stabilityshould be sub-zero treated and/or artificially aged,as volume changes may occur in the course oftime. This applies, for example, to measuring toolslike gauges and certain structural treatmentImmediately after quenching the piece should besub-zero treated to between 95 to 110 F ( 70and 80 C), soaking time 3 4 hours, followed bytempering or aging. Sub-zero treatment will give ahardness increase of 1 3 HRC. Avoid intricateshapes as there will be risk of after quenching is replaced by agingat 230 285 F (110 140 C). Holding time 25 100 O16 Drill diameterCutting speed (vc)Feed (f) 3/16 550*16* 3/16 3/8 5 1050*16* 3/8 5/8 10 1550*16* 5/8 3/4 15 2050*16* *) For coated HSS drills vc ~70 (22 m/min.

9 DRILLINGHigh speed Steel twist drillGRINDINGG eneral grinding wheel recommendation forAISI O1 is given below. More information can befound in the Uddeholm publication Grinding ofTool Steel .Wheel recommendationSoft annealedHardenedType of grindingconditionconditionFace grindingstraight wheelA 46 H VA 46 G VFace grindingsegmentsA 24 G VA 36 G VCylindricalgrindingA 46 L VA 60 J VInternal grindingA 46 J VA 60 I VProfile grindingA 100 L VA 120 J VBlanking tool made from fine-machined aisi O1 drillType of drillCutting dataIndexableSolidBrazedparametersinsert carbidecarbide1)Cutting speed(vc) 530200180 m/min120 160 60 55 Feed (f) ) ) )mm/r ) ) )1)Drills with internal cooling channels and brazedcarbide )

10 Depending on drill millingType of millingCarbideCutting dataSolidindexableHigh speedparameterscarbideinsertsteelCutting speed(vc) 560801) m/min 50120 170251)Feed (fz)in/tooth ) ) )mm/tooth ) ) )CarbidedesignationUSC2C6 C5 ISOK20, P40P20 P30 Electrical-dischargemachiningIf spark-erosion, EDM, is performed in thehardened and tempered condition, the tool shouldthen be given an additional temper at approx. 50 F(25 C) below the previous tempering )For coated end mills vc 115 (35 m/min.)2)Depending on radial depth of cut and cutter results when welding tool Steel can beachieved if proper precautions are taken duringwelding (elevated working temperature, joint prep-aration, choice of consumables and welding pro-cedure).