VANCRON 40 eng-04 - Uddeholm

VANCRON 40CCT-graph (continuous cooling).Austenitizing temperature 1050°C (1920°F). Holding time 30 minutes.°F200018001600140012001000800600400200°C11001000900800700600500PearliteAustenitizing temperature 1050°CHolding time 30 min400Bainite300M s200Martensite100M f12 3 4 5 61 10 100 1 000 10 000 100 000 SecondsA c 1 f= 880°CA c 1 s= 830°CCoolingcurve Hardn. T 800–500No. HV 10 sec1 792 12 707 1403 681 2804 665 13905 597 32056 542 73201 10 100 1 000 Minutes1 10 100 Hours0.2 1.5 10 90 600Air cooling ofbars, Ø mmTTT-graph (isothermal transformation).Austenitizing temperature 1050°C (1920°F). Holding time 30 minutes.°F200018001600140012001000800600400200°C11001000900800700600500400300200100MartensiteAustenitizing temperature 1050°CHolding time 30 minPearliteBainite1 10 100 1 000 10 000 100 000 SecondsA c 1 f= 880°CA c 1 s= 830°CTemp. Time Hardn.°C h HV 10750 2,8 354725 1,3 383700 14,4 363675 6,4 376400 6,6 824350 7,7 882325 1,1 620300 14,2 5851 10 100 1 000 Minutes1 10 100 Hours5

VANCRON 40QUENCHING MEDIA•Vacuum furnace with high speed gas at sufficientoverpressure (2–5 bar)• Martempering bath or fluidized bed at approx.550°C (1020°F)•Forced air/gas.Note 1: Quenching should be continued untilthe temperature of the tool reaches approx. 50°C(120°F). The tool should then be tempered immediately.Note 2: For applications where maximum toughnessis required use a martempering bath or afurnace with sufficient overpressure.TEMPERINGFor cold work applications tempering shouldalways be carried out at 560°C (1040°F) irrespectiveof the austenitizing temperature. Temper three timesfor one hour at full temperature. The tool should becooled to room temperature between the tempers.The retained austenite content will be less than 3%after this tempering cycle.DIMENSIONAL CHANGESDimensional changes after hardening and tempering.Heat treatment: Austenitizing between 950–1100°C(1740–2010°F)/30 minutes and tempering 3 x 1 h at560°C (1040°F).Specimen size: 50 x 50 x 50 mm (2" x 2" x 2") and100 x 40 x 20 mm (4" x 1,5" x 1").Dimensional changes: growth in length, width andthickness +0,04% to +0,20%.SUB-ZERO TREATMENTPieces requiring maximum dimensional stability canbe sub-zero treated as follows:Immediately after quenching the piece could besub-zero treated to between –70 to –80°C (–95and –110°F) or in liquid nitrogen, soaking time1–3 hours, followed by tempering. Sub-zerotreatment will give a hardness increase of ~1 HRC.Avoid intricate shapes as there will be risk ofcracking.Surface treatmentsSome cold-work tools are given a surface treatmentin order to reduce friction and increase tool wearresistance. The most commonly used treatments arenitriding and surface coating with wear resistantlayers of titanium carbide and titanium nitride (CVD,PVD).Vancron 40 have been found to be particularlysuitable for titanium carbide and titanium nitridecoatings. The uniform carbide distribution inVancron 40 facilitates bonding of the coating andreduces the spread of dimensional changes resultingfrom hardening.NITRIDINGA brief immersion in a special salt bath to produce anitrided diffusion zone of 2–20 µm is recommended.This reduces the friction on the envelope surface ofpunches and has various other advantages.PVDPhysical vapour deposition, PVD, is a method ofapplying a wear-resistant coating at temperaturesbetween 200–500°C (390–930°F). As Vancron 40 ishigh temperature tempered at 560°C (1040°F)there is no danger of dimensional changes duringPVD coating.CVDChemical vapour deposition, CVD, is used forapplying wear-resistant surface coatings at a temperatureof around 1000°C (1830°F). It is recommendedthat the tools should be separately hardenedand tempered in a vacuum furnace aftersurface treatment.Note: Vancron 40 is designed to be used withoutsurface coating as it contains a high amount ofnitrogen.6

VANCRON 40WEAR RESISTANCEAdhesive wearWear resistance comparisonComponent: laboratory test stripTool type: blanking punchTool dimension: 10 x 40 mmWork material: 18/8 stainless steel SS 23311 mm thickVANADIS 4Wear loss, µm 2100008000600040002000VANCRON 40VANADIS 4 VANCRON 40TRIBOLOGICAL PROPERTIESResultsSteel / VANADIS VANADIS VANADIS VANCRONSurface 23 6 10 40coating uncoated uncoated uncoated uncoatedPartProduced 83 000 800 000 1 9000 000 >6 000 000Hardness HRC 62 64Failuremechanism Galling Still runningSteel / VANADIS 23Surfacecoating Salt bath nitriding PVD TiN CVD TiC/TiNPartProduced 160 000 130 000 2 000 000Hardness HRC 62Failure DelaminamechanismGalling tionCold forming die for producing a part of stainless steel forpump housing. Courtesy: Grundfos A/S, Denmark.7

VANCRON 40Cutting datarecommendationsThe cutting data below are to be considered asguiding values which must be adapted to existinglocal condition.The machinability of Vancron 40 corresponds to thatof Vanadis 23.TURNINGTurning with carbide Turningwith HSSCutting data Rough Fine Fineparameters turning turning turningCuttingspeed (v c )m/min 110–160 160–210 12–15f.p.m. 361–525 525–689 39–49Feed (f)mm/r 0,2–0,4 0,05–0,2 0,05–0,3i.p.r. 0,008–0,016 0,002–0,008 0,002–0,012Depth of cut (a p )mm 2–4 0,5–2 0,5–3inch 0,08–0,16 0,02–0,08 0,02–0,12Carbidedesignation ISO K20* K15* –CoatedcarbideHigh speed steel twist drillCoatedcarbideor cermet* Use a wear resistant Al 2 O 3 coated carbide gradeDRILLINGDrill diameter Cutting speed v c Feed fmm inch m/min. f.p.m. mm/r i.p.r.– 5 –3/16 10–12* 33–39* 0,05–0,10 0,002–0,0045–10 3/16–3/8 10–12* 33–39* 0,10–0,20 0,004–0,00810–15 3/8–5/8 10–12* 33–39* 0,20–0,25 0,008–0,01015–20 5/8–3/4 10–12* 33–39* 0,25–0,35 0,010–0,014* For coated HSS drill v c= 16–18 m/min. (52–59 f.p.m.)Carbide drillType of drillCutting data Indexable Solid Brazedparameters insert carbide carbide 1)Cuttingspeed, v cm/min 120–150 60–80 30–40f.p.m. 394–492 197–262 98–131Feed, fmm/r 0,05–0,15 2) 0,10–0,25 2) 0,15–0,25 2)i.p.r. 0,002–0,006 2) 0,004–0,010 2) 0,006–0,010 2)1)Drill with internal cooling channels and brazed carbide tip.2)Depending on drill diameter.MILLINGFace and square shoulder millingMilling with carbideCutting data parameters Rough milling Fine millingCutting speed (v c )m/min 80–130 130–160f.p.m. 262–426 426–525Feed (f z )mm/tooth 0,2–0,4 0,1–0,2inch/tooth 0,008–0,016 0,004–0,008Depth of cut (a p )mm 2–4 –2inch 0,08–0,16 –0,08Carbidedesignation ISO K20* K15*Coated carbide* Use a wear resistant Al 2 O 3 coated carbide gradeEnd millingCoated carbideor cermetType of millCarbideCutting data Solid indexable Highparameters carbide insert speed steelCuttingspeed (v c )m/min 45–50 90–110 5–8 1)f.p.m. 148–164 295–361 16–26 1)Feed (f z )mm/tooth 0,01–0,2 2) 0,06–0,2 2) 0,01–0,3 2)inch/tooth 0,0004–0,008 2) 0,002–0,008 2) 0,0004–0,012 2)CarbidedesignationISO – K15 3) –1)For coated HSS end mill v c = 14–18 m/min. (46–59 f.p.m.)2)Depending on radial depth of cut and cutter diameter3)Use a wear resistant Al 2 O 3 coated carbide gradeGRINDINGGeneral grinding wheel recommendation is givenbelow. More information can be found in theUddeholm publication “Grinding of Tool Steel”.Annealed HardenedType of grinding condition conditionFace grinding A 46 HV B151 R50 B3 1)straight wheelA 46 HVFace grinding segments A 36 GV A 46 GVCylindrical grinding A 60 KV B151 R50 B3 1)A 60 KVInternal grinding A 60 JV B151 R75 B3 1)A 60 IVProfile grinding A 100 IV B126 R100 B6 1)A 100 JV1)If possible use CBN wheels for this application.8