ASSAB 8407 SUPREME

1 UDDEHOLMORVAR SUPREMEASSAB 8407 SUPREME22332 Genrale3 ASB8 BASSAB is a trademark of ASSAB Pacific Pte information contained herein is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as a warranty of specific properties of the products described or a warranty for fitness for a particular purpose. Each user of ASSAB products is responsible for making its own determination as to the suitability of ASSAB products and D1141010 REFERENCE STANDARD DF-2 ARNEO1( )(SKS 3) ASSAB DF-3O1( )(SKS 3) ASSAB XW-5 SVERKER 3D6 (D3)( )(SKD 2) ASSAB 12 ASSAB XW-41 SVERKER 11 ASSAB 88 SLEIPNERASSAB PM 23 SUPERCLEANVANADIS 23 SUPERCLEAN(M3:2) 53 ASSAB PM 30 SUPERCLEANVANADIS 30 SUPERCLEAN(M3.)

2 2 + Co) 40 ASSAB PM 60 SUPERCLEANVANADIS 60 SUPERCLEAN( )VANADIS 4 EXTRA SUPERCLEANVANADIS 4 EXTRA SUPERCLEANVANADIS 6 SUPERCLEANVANADIS 6 SUPERCLEANVANADIS 10 SUPERCLEANVANADIS 10 SUPERCLEANVANCRON 40 SUPERCLEANVANCRON 40 SUPERCLEANELMAX SUPERCLEANELMAX SUPERCLEANASSAB 618P20 618 HHP20 618 TP20 718 SUPREMEIMPAX SUPREMEP20 718 HHIMPAX HHP20 40 MIRRAX 40420 1 ESRVIDAR 1 6 UNIMAXUNIMAXCORRAXCORRAXASSAB 420J2 STAVAX ESRSTAVAX ESR420 ESRSUS 420J2 MIRRAX ESRMIRRAX ESR420 HHRAMAX HH420 F PT18 ASSAB MMXLASSAB MM40 ALVAR 14 ALVAR 4 ASSAB 4 ASSAB 8407 2 MORVAR 61 ASSAB 8407 SUPREMEORVAR SUPREMEH13 ESRSKD 61

3 DIEVARDIEVARHOTVARHOTVARQRO 90 SUPREMEQRO 90 SUPREMEFORMVARFORMVARASSAB ASB8 BGeneral ASSAB 8407 SUPREME is a chromium-molybdenum-vanadium alloyed tool steel which is characterised by: High level of resistance to thermal shock and thermal fatigue Good high-temperature strength Excellent toughness and ductility in all direc tions Good machinability and polishability Excellent through-hardening properties Good dimensional stability during hardeningApplicationsTypical analysis %C specificationPremium AISI H13, WNr. , SKD 61 Delivery condition Soft annealed to approx.

4 180 HBColour code OrangeDIE CASTINGIMPROVED TOOLING PERFORMANCEThe name SUPREME implies that by special processing techniques and close control, the steel attains high purity and a very fine structure. Further, ASSAB 8407 SUPREME shows significant im provements in isotropic properties compared to con ventionally produced AISI H13 improved isotropic properties are particu larly valuable for tooling subjected to high mecha ni cal and thermal fatigue stresses, , die casting dies, forging tools and extrusion tooling. In prac ti cal terms, tools may be used at somewhat higher working hardnesses (+1 to 2 HRC) without loss of toughness.

5 Since increased hardness slows down the formation of heat checking cracks, im proved tool performance can be expected. ASSAB 8407 SUPREME meets the North American Die Casting Association (NADCA) #207-2003 for premium high quality H13 die PRESSINGPLASTIC MOULDINGOTHER APPLICATIONSPartTin, leadzinc alloysHRCA luminiummagnesiumalloys, HRCDies46-5042-48 Fixed inserts, cores46-5244-48 Sprue parts48-5246-48 Nozzles35-4242-48 Ejector pins (nitrided)46-5046-50 Plunger, short-sleeve(normally nitrided)42-4642-48 Austenitising 1030 CMaterialAust. temp. HRCA luminium,magnesium alloys1020-1030 C44-52 Copper alloys1040-1050 C44-52 Steels1040-1050 C40-50 PartAust.

6 And tempering mouldsCompression/transfer mouldsAustenitising 1020-1030 CTempering 250 C50-52 ApplicationAust. and tempering coldpunching,scrap shearsAustenitising 1020-1030 CTempering 250 C50-52 Hot ShearingAustenitising 1020-1030 CTempering 250 C Tempering 575-600 C50-5245-50 Shrink rings( , for cementedcarbide dies)Austenitising 1020-1030 CTempering 575-600 C45-50 Wear resistingpartsAustenitising 1020-1030 CTempering 575 CNitridingCore50-52 Surface~1000HV1 PartAluminium,magnesiumalloys, HRCC opperalloysHRCS tainlesssteelHRCDies44-5043-4745-50 Backers, die holders,liners, dummy blocks, stems41-5040-4840-48 Austenitisingtemperature1020 1030 C1040 1050 C42332 Genrale3 ASB8 BApproximate strength at elevated temperaturesLongitudinal of time at high temperatures on hardnessEffect of testing temperature on impact energyCharpy-V specimens.

7 Short transverse DATAH ardened and tempered to 44-46 C400 C600 CDensity kg/m3780077007600 Modulus of elasticity MPa210 000180 000140 000 Coefficient of thermal expansion per C from 20 x x 10-6 Thermal conductivity W/m C252930 MECHANICAL PROPERTIESA pproximate tensile strength at room HRC45 HRCT ensile strength, Rm1820 MPa1420 MPaYield strength, MPa1280 MPaAll specimens are taken from the centre of a 407 x 127 mm bar. Unless otherwise indicated, all specimens were hardened 30 minutes at 1025 C, quenched in air and tempered 2 + 2 h at 610 C to 45 1 HRC. 100200300400500700 C600102030405060708090100200400600800100 0120014001600180020000 Testing temperatureA5, Z%Rm, C400 Testing temperature020406080100 Impact energy, J45 HRC1000100101 Time, h20253035404550 Hardness, HRC500 C550 C600 C650 C52332 Genrale3 ASB8 BHardness, grain size and retained austenite as functions of austenitising temperatureSOFT ANNEALINGP rotect the steel and heat through to 850 C.

8 Then cool in the furnace at 10 C per hour to 650 C, then freely in MEDIA High speed gas/circulating atmosphere Vacuum (high speed gas with sufficient positive pressure). Interrupted quench is recommended for distortion control, or when quench cracking is a concern. Martempering bath or fluidised bed at 450 550 C, then cool in air Martempering bath or fluidised bed at approx. 180 220 C, then cool in air Warm oilNote 1: Temper the tool as soon as its temperature reaches 50 70 2: In order to obtain the optimum properties for the tool , the cooling rate should be fast, but not at a level that gives excessive distortion or graphSoaking time = time at hardening temperature after the tool is fully heated the tool against decarburisation and oxidation during CSoaking time minutesHardness before tempering10253053 2 HRC10501554 2 HRCHeat treatmentSTRESS RELIEVINGA fter rough machining, the tool should be heated through to 650 C, holding time 2 hours.

9 Cool slowly to 500 C, then freely in temperature: 600 850 C, normally in two preheating steps. Austenitising temperature: 1020 1050 C, normally 1020 1030 the tempering temperature according to the hardness required by reference to the tempering graph. Temper at least twice with interme diate cooling to room temperature. The lowest tempering temperature which should be used is 250 C. The minimum holding time at tempering tem perature is 2 hours. To avoid temper brittleness , do not temper in the range 425 550 C, see graph. Austenitising tempertureRetained austenite, %Hardness, HRCR etained austeniteGrain sizeHardness525456586050 GrainSizeASTM484644424010864642100010201 0401060 C100200300400500700 C600 Austenitising brittleness zoneRetained austenite, %Hardness, HRC1050 C1020 C1025 CRetained austenite2530354045505560246 Tempering temperature (2h + 2h)62332 Genrale3 ASB8 BWidth%Length%Thickness%Oil hardened from 1020 0+ hardened from 1020 + + 0+ hardened from 1020 + + + + graphAustenitising temperature 1025 C.

10 Holding time 30 CHANGES DURING HARDENING Specimen size: 100 x 100 x 25 CHANGES DURING TEMPERING Note: The dimensional changes in hardening and tempering should be within the range 425 550 C is normally not recommended due to the reduction in toughness impact strength at different tempering temperaturesCharpy-V specimens, short transverse direction. 100200300400500600 CTemper brittleness zoneTempering temperature (2h + 2h)20406080100 Impact strengthKV Joule Tempering temperature (1h + 1h)100200300400500600700 C- + + + change, % Austenitising temperature 1025 CHolding time 30 minutes110010009008007006005004003002001 00 C12543678910110100100010 000100 000 Seconds1101001000 Minutes110100 HoursAir cooling ofbars, = 940 CAC1 = 840 C101987654322227076736136135995925605194 8320768161053165271054277252717944 CoolingCurve 10T800-500(sec)