ImPAX HH - ssm.co.nz

1 UddeHolmImPAX HHASSAB 718 HH2 ASSAB 718 HHThis information 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 080718 ReFeReNCe STANdARd 3XW-5 SVeRKeR 3d6 (d3)( )(SKd 2) 12XW-41 SVeRKeR 11 CARmoCARmoCAlmAXCAlmAXCAldIeCAldIeASSAB 88 SleIPNeRASP 23 VANAdIS 23(m3:2) 53 ASP 30 VANAdIS 30m3:2 + 40 ASP 60 VANAdIS 4 eXTRAVANAdIS 4 eXTRAVANAdIS 6 VANAdIS 6 VANAdIS 10 VANAdIS 10 VACRoN 40 VANCRoN 40618P20 HHP20 TP20 SuPRemeImPAX SuPRemeP20 HHImPAX HHP20 eSRSTAVAX eSR420 eSRSuS 420J2mIRRAX eSRmIRRAX eSR420 lHRAmAX lH420 F HHRAmAX HH420 F SCmmXlmoldmAX Xlmm40moldmAX HHAlVAR 14 AlVAR 48407 2moRVAR 618407 SuPRemeoRVAR SuPRemeH13 eSRSKd 61dIeVARdIeVARHoTVARHoTVARQRo 90 SuPRemeQRo 90 718 HHGeneral718 Hi Hard is a prehardened mould steel, which offers the following benefits.

2 No hardening risks No hardening costs Time saving ( , no waiting for heat treatment) Lower tool cost ( , no distortion to rectify) Modifications easily carried out Can be subsequently nitrided to increase surface wear resistance and locally flame hardened to reduce surface damage718 Hi Hard is manufactured to consistently high quality standards with a very low sulphur content, giving a steel with the following characteristics: Good polishing and photo-etching properties Good machinability High purity and good homogeneity Uniform hardnessNote: 718 Hi Hard is 100% ultrasonic sections are supplied premachined, which offers the following advantages compared with unmachined material.

3 Saving of weight Free of decarburised surface Exact nominal size (plus tolerance) Less machining Absence of scale minimises machine and tool wearApplications Injection moulds for thermoplastics Extrusion dies for thermoplastics Blow moulds Forming tools, press-brake dies (possibly flame hardened or nitrided) Aluminium die casting prototype dies Structural components, shaftsPropertiesPHYSICAl PRoPeRTIeSDelivery C200 C400 CDensity kg/m37 8007 7507 700 Modulus of elasticity MPa205 000200 000185 000 Coefficient of thermal expansion per C from 20 x x 10-6 Thermal conductivity W/m C293031 Specific heat J/kg C460--Typical analysis %C < specificationAISI P20 modified, WNr.

4 ConditionHardened and tempered to 340 - 380 HBColour codeYellow / GreenmeCHANICAl PRoPeRTIeSTensile strength and compressive strength depend on the hardness in the delivered strengthApproximate tensile strength at room HB370 HBTensile strength, Rm1110 MPa1180 MPaYield strength, 985 MPa1090 MPaHardness340 HB370 HBComprehensive yield strength, MPa1150 MPaComprehensive strengthApproximate comprehensive strength at room cavities injection mould for making toothbrush 718 HHTuRNINGmIllINGFace and square shoulder millingCutting data parametersMilling with carbideRough millingFine millingCutting speed (vc) m/min100 - 140140 - 170 Feed (fz) - - of cut (ap) mm2 - 4 2 Carbide designation ISOP20 - P40 Coated carbideP10 Coated carbide or cermetCutting data parametersTurning with cableTurning with HSS Rough turningFine turningFine turningCutting speed (vc)

5 M/min100 - 150150 - 20010 - 15 Feed (f) - - - of cut (ap) mm2 - - - designation ISOP20 - P30 Coated carbideP10 Coated carbide -Drill diameter mmCutting speed (vc) m/minFeed (f) mm/r 518 - - - 1018 - - - 1518 - - - 2018 - - * For coated HSS, uncoated HSS drill is not recommended1 Drill with internal cooling channels and brazed carbide tip2 Depending on drill diameterCutting data parametersType of drillIndexable insertSolid carbideBrazed carbide1 Cutting speed (vc) m/min150 - 170120 - 15060 - 90 Feed (f) - - - milling1 For coated HSS end mill, vc~ 45 50 m/min2 Depending on radial depth of cut and cutter diameterCutting data parametersType of millingSolid carbideCarbide indexable insertHigh speed steelCutting speed (vc) m/min60 - 10060 - 10025 - 301 Feed (fz)

6 - - - designation ISOK10, P40P20 - P30-Carbide drilldRI llINGHigh speed steel twist drill* High speed steelType of grindingGrinding wheel designationSurface grinding straight wheelA 46 HVSurface grinding segmentsA 36 GVCylindrical grindingA 60 KVInternal grindingA 60 IVProfile grindingA 120 JVGRINdINGW heel recommendationMachining recommendationsThe cutting data below are to be considered as guiding values and as starting points for developing your own best : Prehardened condition ~360 HB5 ASSAB 718 HHHeat treatment718 Hi Hard is intended for use in the hardened andtempered condition, , the delivery condition.

7 When,however, the steel is to be heat treated to a higherhardness or case hardened, the following instructions may be ANNeAlINGP rotect the steel and heat through to 700 C. Then coolin the furnace at 10 C per hour to 600 C, then freely RelIeVINGA fter rough machining, the tool should be heated through to 550 C, holding time 2 hours. Cool slowly to room : The steel should be fully soft annealed temperature: 500 600 CAustenitising temperature: 850 CThe steel should be heated through to the austenitisingtemperature and held at temperature for 30 the tool against decarburisation and oxidationduring the hardening medIA Oil (60 80 C) Martempering bath at 300 C, max.

8 4 minutes, then cool in airNote: Temper the tool as soon as its temperaturereaches 50-70 the tempering temperature according to thehardness required by reference to the tempering twice with intermediate cooling to roomtemperature. Lowest tempering temperature 180 C forsmall inserts, but preferred minimum is 250 C. Theminimum holding time at temperature is 2 graphThe diagram is valid for small samples 15 x 15 x 40 mmaustenitised 30 minutes at 850 C, quenched in air andtempered 2 + 2 200 300 400 500 600 700 CHB600550500450400350300250200 HRC555045403530 HardnessTempering temperatureSurface treatmentNITRIdING ANd NITRoCARBuRISINGN itriding gives a hard surface, which is very resistant towear and erosion.

9 A nitrided surface also increases thecorrosion best results, the following steps should be followed:1. Rough machining2. Stress tempering at 550 C3. Grinding4. NitridingThe following surface hardness and nitriding depths willbe achieved after nitriding:ProcessTimehSurface hardnessHV1 DepthmmGas nitriding at 525 nitriding at 480 nitrocarbursing at 570 CHRome PlATINGA fter plating, the tool should be tempered at 180 C for 4 hours, within 4 hours of plating, to avoid the risk ofhydrogen embrittlementFlAme ANd INduCTIoN HARdeNING718 Hi Hard can be flame or induction hardened to ahardness of approx.

10 50 hardening may cause a certain amount of distortion, depending on the design of the mould. If possible, flame hardening should be carried out directly after rough machining. Grinding will then be performed after flame surface to be hardened is heated continuously bymeans of a gas flame to approx. 850 C (pale-red colour), followed by cooling in air. The gas flame may be an ordinary oxyacetylene flame. The size of the blowpipe and the temperature of the gas are adapted so that the heating is accomplished in a few flame hardened tool does not need to be temperedas this would cause a drop in 718 HHWelding methodTIGMMAP reheating temperature200 - 250 C200 - 250 CFiller material718 TIG-WELD718 WELDM aximum interpass temperature375 C375 CPost weld cooling20 C - 40 C/h for the first two hours and then freely in airHardness after welding300 - 330 HB300 - 330 HBHeat treatment after weldingTool that need to be polishedTemper at 520 C for 2 hTool that need to be