Hot Work Tool Steels - Hitachi Metals

1 Hot work tool Steels2<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product. This catalog and its contents are subject to change without Hot work tool SteelsIsotropy tool Steels are so named becase the difference in mechanical properties between its longitudinal (forging or rolling direction) and transverse directions is reduced, thus overcoming a weak point of ordinarily processed Steels . This technological concept, which is highly evaluated by users of tool Steels , is applied for the production of all our Steels and contributes significantly to stabilizing their characteristics and enhance their service compositions of YSS hot work tool Steels Impurities such as P and S are controlled below the levels specified in JIS by using Hitachi Metals ' own high-qualtity raw composition (%)

2 Toughness of Isoropy LTLTI sotropy DACSKD61 Index of 2mm U-notch Charpy I-ValueHardness 47 HRCL Longitudinal direction T Transverse direction OthersMatrix HSSSKT4 SKD61 free cuttingSKD8 modifiedSKD7 modifiedSKD7 modifiedSKD61 modifiedSKD61 modifiedSKD61 modifiedOther specialelements addedOther specialelements addedOther specialelements addedGradeJIS equivalentDAC DAC-MAGICDAC10 DAC55 DAC3 DAC40 YEM-K MDC-K FDAC DMYXR33 SKD61 modifiedOriginal steel 3<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product. This catalog and its contents are subject to change without Hot work tool SteelsApplications of YSS hot work tool steels41- 51 HRC41- 49 HRC41- 49 HRC40 - 50 HRC52 - 58 HRCN itriding 64 HRC35 - 45 HRC45 - 49 HRC45 - 49 HRC44 - 50HS44 - 50HS60 - 65HS60 - 65HS60 - 69HS46 - 60HS46 - 51HS60 - 65HS60 - 69HS60 - 65HS60 - 65HS60 - 65HS60 - 65HS60 - 65HS60 - 65HS60 - 65HS60 - 65HS55 - 60HS55 - 65HS52 - 62HS46 - 56HS55 - 59HS53 - 57HS50 - 55HS50 - 59 HRC45 - 49 HRC46 - 50 HRC37 - 45 HRC28 - 45HS 80 HSDAC FDAC 38 - 42 HRC DAC DACDAC, MDC-KDMDMDACDACDAC, DAC3 HRD20 46 - 51HS DACDACDACDAC, DAC3DM, DACDACDACDACDAC, DAC3DM, DACDM, DACDACMDC-KYEM-KDACDAC, DMHI-PM38 YXM1 DAC-MAGIC, DAC10 DAC55 YXR33 DAC3, DAC40 HRD10 56 - 60HS DAC.

3 DAC3 DACDAC3 YEM-KYEM-KHRD10 56 - 60HS DAC3 YAG300 69 - 75HS DAC3 DAC3 HRD10 56 - 60HS DAC3 DAC3 YEM-KDAC3 HRD10 56 - 60HS DAC3 DAC3 DAC3 YXR3, YXR33 MDC-KYEM-K ZHD11, SUS310S DAC, FDAC 38 - 42 HRC MDC-KDACAHD32 HRD20DM or Aluminium alloys or Magnesium alloys or Zinc alloys or Copper alloys for Magnesiumfor Aluminiumfor Copperfor Aluminiumfor Copperfor Aluminiumfor Copperfor Aluminiumfor pure Copperfor Brassfor Aluminiumfor Copperfor Aluminiumfor Copperfor Aluminium or copperfor Aluminiumfor Copperfor Aluminiumfor Copperfor Aluminium or copperfor Aluminium or copperfor small size diesfor middle size diesfor large size diesfor small size diesfor middle size diesfor large size diesDiesContainer tyreOuter sleeveInner sleeve (Liner)StemDie holderMandrelDummy blockCore pin for die casting or die casting or extrusion tool or forging dieSleeveGoose neckDie backerMandrel holderBolster or press forging or hammer forgingWarm forging diesHeader dies*1 Upset tool *2 Use for thick billet shearing*1 Use for bolt hot formingApplicationStandard hardnessRecommended YSS steelfor general usefor mass production useShear blade*2 Glass moldsGlass shearDAC, DAC3 YEM-K, MDC-K4<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product.

4 This catalog and its contents are subject to change without Hot work tool SteelsTypes and features of YSS hot work tool steelsGradeJIS equivalentFeaturesDACDAC3 SKD61 DAC55 DAC10 DAC40 FDACYEM-KMDC-KDMSKT4 YXR33 DAC-MAGICM atrix HSSS tandard grade for general use with good balance of toughness, strength at elevated temperature and with excellent performance die steel for die casting with well balanced strength and toughness and strength at elevated temperature. Excellent heat crack and stress corrosion crack heat crack and wear resistance at elevated temperature. steel for precision die casting and hot press casting die steel with excellent heat crack resistance and work tool steel with higher toughness than DAC for Al extrusion dies with high hardness or hot forging press dies with good crack extrusion die steel with higher strength and better softening resistance at elevated temperature than work tool steel with higher toughness and strength at elevated temperature than SKD7 for forging die of mass production use such as hot strength hot work tool steel with higher toughness than SKD8 for high heat load applications such as Cu extrusion and Cu alloy die casting cutting hot work tool steel (supplied in prehardened condition)

5 For dies of small production use or dies associated parts requiring good work tool steel with excellent toughness, used for hammer forging dies, Aluminium forge dies, forging bolsters and extrusion die backers, high speed steel with high toughness. Excellent strength and wear resistance at elevated temperature and excellent erosion resistance. steel for warm and hot precision forging dies and insert pins for die cuttingSKD8 modifiedSKD7 modifiedSKD7 modifiedSKD61 modifiedSKD61 modifiedSKD61 modifiedSKD61 modified5<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product. This catalog and its contents are subject to change without Hot work tool SteelsCharacteristics of YSS hot work tool steelsDAC DAC-MAGICDAC10 DAC55 DAC3 DAC40 YEM-K MDC-K FDAC DMYXR33 CBBB C B A ACDA CBBB C B A ACDA AA AA A B BCCA CCBBB C B A ACDA AAAAA+B+A B BBRatings.

6 A Best C Ordinary D Poor(Remarks) Please use above ratings only for general at elevated temperatureSoftening resistanceToughnessWear resistanceHardenabilityComparison of propertiesCharacteristics of hot work tool steelsSKD8 SKD5 SKD4 SKD7 Warm forgingPrecision hot forgingDie castingHot formerPrehardened steelAluminium extrusiondiesHot press/forgingHammer forging, Extrusion auxiliary toolToughnesshighStrength at high temperaturehighDM(SKT4) Standard steel (JIS equivalent) Original steelYXR33 MDC-KYEM-KDAC40 DAC10 DAC(SKD61)FDACDAC-MAGICDAC55 DAC36<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product. This catalog and its contents are subject to change without Hot work tool SteelsProperties of YSS hot work steels432130040050060020406080100840800A 1 point C Area ratio of carbides (%)Tensile strength at 700 C (N/mm2)Tensile strength at 700 C (N/mm2)Tensile strength at 700 C (N/mm2)Tensile strength at 700 C (N/mm2)(Index of charpy impact value)High -temperature strengthToughness4321300400500600840800 Area ratio of carbides (%) High -temperature strengthToughness4321300400500600840800 Area ratio of carbides (%)High -temperature strengthToughness43213004005006002040608 010020406080100840800 Area ratio of carbides (%)

7 High -temperature strengthToughnessDAC48 HRCDAC351 HRCYEM-K50 HRCYXR3357 HRC Hot forging die wear mechanism"microstructure" and influencing oxide filmHeat affected layerProgress and confluence of cracksProgress of crack into the insideLower hardness layerRe-hardend layerHeated up above A1 transformation point Crack openingLoss by plastic flowPropertiesArea ratio of carbidesA1 pointStrength at elevated temperatureToughnessSlinding property of die surface (Friction property)Anti-rehardenability Deformation resistanceCatastrophic crack resistance Influencing factorsSliding wearSoftening to abrationMinor crack Catastrophic crackExtent of impact on die damageSpalling off from re-hardened boundry layerWork material flow direction20406080100(Index of charpy impact value)(Index of charpy impact value)(Index of charpy impact value)A1 point C A1 point C A1 point C White layerBlack layer7<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product.

8 This catalog and its contents are subject to change without Hot work tool SteelsProperties of YSS hot work steelsQuenching speed vs charpy I-valueFatigue strength (Rotating bending fatigue test by Ono method)Tempering parameterTensile strength at elevated temperatureCharpy impact value at room temperatureTransition property of charpy impact valueYXR33 MDC-KYEM-KDACDM171819202122P=T (20+log t) /103T : Temperature K t : Time h 200300400500600 Hardness HV DACYEM-KHardness HRC Hardness HRC DAC3 YXR3340455055607060504030201002mm U-notch Charpy impact value J/cm2 DAC-MAGICT empering parameter0501001502003002500880706050403 0201007654321 Quenching temperature 1,020 C 30minOil quenchHardness 44 HRCHTT(Half temperature time) 30minHTT 60minJ/cm2kgf-m/cm2 Testing temperature C Testing temperature C 2mm V-notch Charpy impact value2,4002,2002,0001,8001,6001,4001,200 1,00080060040020000 100200300400500600700800900 YXR33 58 HRC YXR33 55 HRC YEM-K 44 HRC DAC 40 HRC DAC 44 HRC DAC 50 HRC Tensile strength N/mm2 40444852 StressNumber of rotations till fracture (times)012345678J/cm2kgf m/cm2 Oil quenchHalf temperature time01020304050607080 Room temperature400 CHeat treatmentQuenching : Tempering : Hardness.

9 1,030 C Air cool580 C 1H 250 HRC500 C807570656055504580075070065060055050045 0N/mm2kgf/mm210510610710830min45min60min 15minHalf temperature time :Time required for cooling from quenching temperatureto (Quenching temperature + Room temperature)/2 Quenching temperature 1,020 C YXR33 1,080 C Oil quenchMaterial DACQ uenching temperature 1,020 C2mm U-notch Charpy impact value Material DACM aterial DAC8<A ttenti on> The characteristics, photos, charts, rankings and evaluations of this catalog are representative value by our test data, it does not guarantee the quality of the product. This catalog and its contents are subject to change without Hot work tool Steels1. Holding time at quenching(1) Preheating timeQuenching and tempering time of YSS die steelsFurnace Vacuum furnace, Salt bathThickness (mm)Holding time (min)Thickness (mm)Holding time (h) 1515 25126 - - 64265 - 84385 - 1244125 - 1745175 - 2496250 - 3497350 - 4998252550407550100601256515070200803001 00 Notice : Tempering is needed more than 2 times.

10 (2) Holding time at quenching2. Holding time at temperingAnnealed HardnessHBWHeat treatment condition C Annealing condition C Quenching and tempering hardnessPrehardened steel (Delivery in hardened condition) 229229229241229229229241248241 QuenchingAir cool (Oil quench)Air cool (Oil quench)Oil quench (Air cool)Oil quench (Air cool)Air cool (Oil quench)Oil quenchOil quench (Air cool)Oil quenchOil quenchOil quench1,000 - 1,050 1,010 - 1,030 1,010 - 1,030 1,010 - 1,030 1,000 - 1,050 1,000 - 1,050 1,000 - 1,050 1,050 - 1,140 830 - 880 1,080 - 1,140 Slow coolingSlow coolingSlow coolingSlow coolingSlow coolingSlow coolingSlow coolingSlow coolingSlow coolingSlow coolingAir coolAir coolAir coolAir coolAir coolAir coolAir coolAir coolAir coolAir cool550 - 650550 - 640550 - 650550 - 650550 - 650550 - 650550 - 650600 - 700400 - 650550 - 600 TemperingHRCMINMINMINMINMINMINMINMINMINM IN5050505050504648 38 - 42 4254 MAXMAXMAXMAXMAXMAXMAXMAXMAXMAXDAC DAC-MAGICDAC10 DAC55 DAC3 DAC40 YEM-K MDC-K FDAC DMYXR33 GradeStandard heat treatment conditions for YSS hot work tool steelsFirst stage: 500-550 C quenching holding time 2 Second stage.