HOT WORKING TOOL STEELS - hitachimetals.com

1 1 HOT WORKING TOOLSTEELSHOT WORKING TOOLSTEELSC haracteristics of YSS Cold Work tool SteelsCharacteristics of YSS Cold Work tool Steels2 HOT WORKING tool STEELSHOT WORKING tool STEELSDAC(SKD61)DM(SKT4)Warm forging56~58 HRCP recision hot forging47~56 HRCHigh speed hot forging47~54 HRCHigh performancedie casting43~53 HRCG eneral purpose hot press/forging40~48 HRCT oughnessHigh temperatrure strength, Wear resistanceYXR33 DAC45 YEM-KDAC40 DAC10 DAC55 DAC3 FDACMDC-K3 Applications and YSS grade Features Applications and YSS grade Features HOT WORKING tool STEELSHOT WORKING tool STEELSDACDAC3 DAC10 DAC40 DAC55 YEM-KMDC-KDAC45 YXR3 YXR33 DMFDACSKD61 SKT4 General-purpose hot- WORKING tool steel used in a wide range of hot- WORKING tool steel which has improved hardenability and greater toughness than DAC, and helps avoid cracking in hot- WORKING press dies, high-hardened Al extrusion for precision die casting and hot- WORKING press die which has excellent heat crack resistance and wear extrusion die steel and hot- WORKING press die steel which has better high-temperature strength and softening resistance than steel for large or squeeze die casting moulds with excellent heat crack tool steel with the improved high-temperature strength and toughness of JIS-SKD7 high-strength hot WORKING tool steel with the improved toughness of great high-temperature strength and outstanding crack resistance, and is suited for hot- WORKING press dies requiring wear resistance and high Si-Al die-cast molds requiring erosion matrix high speed matrix high speed steel for hot- WORKING tools, and excellent wear resistance and crack resistance.

2 Can withstand high-temperature loads such as in warm-and hot- WORKING precision forging steel for hammer hot- WORKING tool JISequivalentFeaturesApplicationsHot forging dies,Extrusion dise, Die casting forging dies,Extrusion casting dies,Extrusion casting forging forging casting dies,Hot forging forging forging dies,Anti-meltdown insert for small lot, Simple diesHolding WORKING tool STEELSHOT WORKING tool STEELSC hemical compositions of YSS hot- WORKING tool steels4*Harmful impurities such as S, Cu and Ni are restricted to below JIS levels using Hitachi Metals' own high-quality raw YSSG radeChemical composition SKD61 (Original steel )(Original steel )(Original steel )(Original steel )(Original steel )(Original steel )(Original steel )(Original steel )(Original steel )SKT4 SKD61 Free cuttingHigh toughness die steelHigh-strength die steelHigh-strength Al extrusion die steelHigh-strength and toughness die steelHigh-strength die steelHigh-strength die steelHigh-strength die steelMatrix high speed steelMatrix high speed steelNi JIS equivalent5 HOT WORKING tool STEELSHOT WORKING tool STEELS Heat Treatment Heat Treatment Thickness(mm)Holding time(min) 1515252550407550100601256515070200803001 00 The salt bath needs preheating.

3 Set the Soaking time same as the holding time.(1) Simple shape tools (2) The others, especially needs toughnessThickness (mm)Holding time (h) time at tempering temperatureCaution:(2) Holding time at hardening temperatureFurnace Electrical furnace, Salt time at hardening temperature(1) Preheating timeFirst stage: 500~550 C hardening temperature holding time x 2 Second stage: 750~800 C hardening temperature holding time x 1 But preheating can be omittted when the electrical furnaces process is used or when workpieces are 50mm or under in thickness or a simple heat treatment conditions for YSS hot- WORKING tool steelsQuenching and tempering time of YSS die steelsDACDAC3 DAC10 DAC40 DAC55 YEM-KMDC-KDAC45 YXR3 YXR33 DMFDACG rade 1000-1050 Oil cooling(Air cooling)1000-1050 Oil cooling(Air cooling)1010-1030 Oil cooling(Air cooling)1000-1050 Oil cooling1010-1030 Oil cooling(Air cooling)1000-1050 Oil cooling(Air cooling)1050-1140 Oil cooling1060-1080 Oil cooling(1)1150-1170,(2)1130-1150 Oil cooling1080-1160 Oil cooling830-880 Oil cooling550-650 Air cooling550-650 Air cooling550-650 Air cooling550-680 Air cooling550-650 Air cooling550-650 Air cooling600-700 Air cooling580-650 Air cooling560-590 Air cooling550-600 Air cooling400-650 Air coolingHardness(HBW)

4 AnnealingQuenchingTemperingTemperatureTe mperatureHardness(HRC)Temperature820-870 Slow cooling820-870 Slow cooling820-870 Slow cooling820-870 Slow cooling820-870 Slow cooling820-870 Slow cooling820-870 Slow cooling820-870 Slow cooling800-880 Slow cooling800-880 Slow cooling750-800 Slow cooling 229 229 229 229 229 229 241 241 241 241 241 53 53 53 53 53 53 55 55 57 56 50 38-42 Delivery in prehardened condition 6 HOT WORKING tool STEELSHOT WORKING tool STEELSQ uenched and tempered hardness curveQuenched and tempered hardness curve0300400500600700 Tempering Temperature ( C)1,050 C950 CHardness(HRC)20304050601,100 C1000 CHardness(HRC)20103040506004005005506506 00700 Tempering Temperature ( C)1,020 CHardness(HRC)20103040506004005005506506 00700 Tempering Temperature ( C)1,020 CHardness(HRC)30254035455550600400500550 650600700 Tempering Temperature ( C)1,020 C1,040 C1,000 CHardness(HRC)20103040506004005005506506 00700 Tempering Temperature ( C)1,020 CHardness(HRC)10203040506004005006005506 50700 Tempering Temperature ( C)950 C1,050 C1,000 CHardness(HRC)20403050600400500550600650 700 Tempering Temperature ( C)1,050 C1,090 C1,130 CHardness(HRC)20403050600400500550600650 700 Tempering Temperature ( C)1,070 CHardness(HRC)52504858565464626060500550 600700 Tempering Temperature ( C)1,200 C1,175 C1,150 C1,125 CHardness(HRC)48464454525060585662500550 600650 Tempering Temperature ( C)1,160 C1,140 C1,120 CHardness(HRC)20050040030060010003002004 00500600700 Tempering Temperature ( C)100mm cube300mm cube850 CYXR3 YXR33 DMMDC-KDAC10 DAC55 DAC40 DAC45 YEM-KDACDAC37 HOT WORKING tool STEELSHOT WORKING tool STEELSP ropertiesA1 Point( C)Carbide (Area ratio)(Charpy impact value)

5 J/cm2 High -temperature strengthToughness43213004005006002040608 40800(Tensile strength at 700 C) N/mm2%Hot forging diesGuide for selecting die materials (example)Extrusion diesHigher resistance to softening by multiple nitridingLarge dieHigher resistance to deflectionHigher resistance to deflectionDAC40 DAC10 DAC3(Higher hardness)DACG eneralDie casting diesAnti-meltdown Insert pinFor high melting point alloyPrecision die castingHigh resistance to heat crackDAC45 YXR33 DAC55 DAC10 DACG eneralFor severe forging conditionWarm forging, Gear forgingPrecision hot forgingHot former Higher resistance to heat crack and wear(Low raising temperature by forging)YXR33(Higher wear resistance)DAC45(Higher resistance to progress of crack)DACG eneralYEM-KDAC3(Higher hardness) Comparison PropertiesDACDAC3 YEM-KDAC45 YXR338 HOT WORKING tool STEELSHOT WORKING tool STEELSH ardenabilityNitriding propertyTempering parameterTensile strength at elevated temperatureCharpy impact value at room temperatureCharpy impact value at elevated temperatureHalf temperature time=Time required for cooling from quenching temperature to (Quenching temperature+Room temperature) /2 Relationship between half temperature time and quench hardness of hot WORKING steels1002003004005006003 46 8102030406080100200200100300 400500 600300400010203040506070 Relationship between diameter of round bar and half temperature time for the center part of the barDiameter of round bar (mm)Diameter of round bar (mm)DM (850 C)DAC (1,025 C)Half temperature time (min)Oil cooling Air coolingOil coolingHardness(HRC)YXR33 MDC-KYEM-KDACDM171819202122P=T (20+log t) /103T:Temperature(k)t.

6 Time(h)200300400500600 Hardness(HV)Tempering parameter1800354045505560700 CDAC3 YXR33 YEM-K02004006008001000120014001600600 CYXR33 YEM-KDAC3 DACDACH ardness (HRC)Tensile Strength(N/mm2)Hardness (HRC)DACYEM-KYXR33 DAC335404550556060504030201002U Charpy impact value(J/cm2) from surface (mm)570 C X 90minNitriding in salt bathHardnes (HV)Properties0100200300400 500600 700050100150DM(42 HRC)DAC(44 HRC)Testing temperature ( C)2U Charpy impact value(J/cm2)Air cooling9 HOT WORKING tool STEELSHOT WORKING tool STEELS [W/(m k)][X10-6/ C]200 of thermal expansionGrade[GPa]20 C206211200 C196204400 C178190600 of elasticityGrade200 Thermal conductivityGradeJanuary 2008 (PDF)Head OfficeHead OfficeOther OfficeHead OfficeGuangzhouLiaison OfficeDalian BranchTianjin BranchBeijingLiaison OfficeGuangzhouLiaison OfficeTel.+81-3-5765-4410 Fax.+81-3-5765-8317 Tel.+1-914-694-9200 Fax.+1-914-694-9279 Tel.

7 +49-211-16009-0 Fax.+49-211-16009-29 Tel.+65-6861-7711 Fax.+65-6861-1519 Tel.+86-21-6358-6368 Fax.+86-21-6358-6327 Tel.+86-769-640-6726 Fax.+86-769-640-6716 Tel. +86-411-8718-1011/1022 Fax.+86-411-8718-1033 Tel. +86-22-8699-3101/3102 Fax.+86-22-8699-3103 Tel.+86-10-6590-8775 Fax.+86-10-6590-8776 Tel.+86-20-8755-3649 Fax.+81-20-8755-3650 SEAVANS North Building, 1-2-1, Shibaura, Minato-ku,Tokyo 105-8614, Japan Specialty steel Company2 Manhattanville Road, Suite 301,Purchase, NY 10577, , Detroit, Charlotte, San JoseImmermannstrasse 14-16,40210 Duesseldorf, Germany12 Gul Avenue, Singapore 62965611F, Tian An Center, NanJing Road (West),Shanghai, 200003, ChinaCha Shan Town, Dong Guan City, 522380 China3-2, Koushin Mould Industrial Park III Z. Dalian, Workshop, Wenxin Industrial Park, JingxiangRoad, Xiaodian Town, Beichen EconomicDevelopment Zone, Tianjin, China Room , Beijing Fortune Building,5 Dong San Huan Bei-Lu, Chaoyang District, Beijing, 100004 ChinaR3303, Metro plaza,183 Tianhebei Road Tianhe District, Guangzhou city, Guangdong, 510075 China The characteristics listed in this catalog are representative average values which may differ from actual product characteristics.

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