Uddeholm Mirrax 40

1 UddeholmMirrax 40 Uddeholm Mirrax 402 This information is based on our present state of knowledge and is intended toprovide general notes on our products and their uses. It should not therefore beconstrued as a warranty of specific properties of the products described or awarranty for fitness for a particular according to EU Directive 1999/45/ECFor further information see our Material Safety Data Sheets .Edition 2, UDDEHOLMS ABNo part of this publication may be reproduced or transmitted for commercial purposeswithout permission of the copyright is a trade mark registered in the European Union and in the reg.

2 No. 3,481,025 Uddeholm Mirrax 403 PROPERTIESPHYSICAL DATAH ardened and tempered to 360 HB. Data atroom and elevated C200 C400 C(68 F)(390 F)(750 F)Densitykg/m37 700 of elasticityMPa215 000210 000195 x x x 106 Coefficient ofthermalexpansion / C from 20 C x 10 x 10 6 / F from 68 x 10 x 10 6 ThermalconductivityW/m C 2021 Btu in/(ft2h F)139145 Specific heatJ/kg C460 Btu/lb, Mirrax 40 is a remelted stainlesstool steel supplied prehardened to 40 Mirrax 40 is produced using theelectroslag remelting (ESR)

3 Process anadditional step in the steelmaking process thatensures very clean steel with low sulphurcontent ( max.) and non-metallicinclusions. Consequently, Uddeholm Mirrax 40is capable of being polished to a very highsurface Mirrax 40 is characterized by: excellent machinability excellent polishability excellent ductility and toughness uniform hardness even in large dimensions good indentation resistance good corrosion resistanceThese properties combine to give a steel withoutstanding production practical benefits of good corrosionresistance can be summarized as follows.

4 Lower mould maintenance costThe surface of cavity impressions retain theiroriginal finish over an extended service stored or operated in humid condi-tions require no special protection. Lower production costsSince cooling channels are less likely to beaffected by corrosion (unlike conventionalmould steel), heat transfer characteristicsand therefore cooling efficiency are constantthroughout the mould life, ensuring consist-ent cycle benefit of the prehardened condition canbe summarized as follows. No hardening risks No hardening costs Time saving, no waiting for heattreatment Lower tool cost ( no distortion to rectify) Modifications easily carried outTypicalCSiMnCrMoNiVNanalysis % +StandardspecificationAISI 420 modifiedDeliveryconditionPrehardened to 360 400 HBColour codeOrange/greenAPPLICATIONS Injection moulds for corrosive and non-corrosive plastics Plastic moulding of high surface finishproducts ( , Bezels and casings for TVand computers)

5 Blow moulding of corrosive plastics orhigh surface finish transparent products( PET bottles) Extrusion dies Constructional partsIn addition, the combination of high hardnesswith a high toughness results in a mould withgood resistance to indentations and minimizethe risk of unexpected failures, leading to asafer mould and a prolonged tool Mirrax 404 MECHANICAL DATATENSILE STRENGTHAll specimens have been taken from a bar withthe dimension 508 x 306 mm (20" x 12"),hardness 360 C200 CTesting temperature(68 F)(390 F)Tensile strength, RmMPa 1 150 1 060 psi163 800153 700 Yield strength, 1 020 930psi147 900134 800 Reduction of area, Z %3538 Elongation, A5 %1311 COMPRESSIVE STRENGTHC ompressive yield strengthat room temperature.

6 N/mm2 1 100psi 159 500 CORROSION RESISTANCEM oulds made from Uddeholm Mirrax 40 willhave good resistance to rusting caused byhumid working and storage conditions andwhen moulding corrosive plastics undernormal production TREATMENTU ddeholm Mirrax 40 is intended for use in theas-delivered condition hardened andtempered to 360 400 the steel is to be heat treated tohigher hardness, instructions below are to ANNEALINGP rotect the steel and heat through to 780 C(1430 F). Cool at 10 C (50 F) per hour to600 C (1110 F), then freely in RELIEVINGA fter rough machining, the tool should beheated through to max.

7 550 C (1020 F),holding time 2 hours, then cool freely in : It is recommended to do soft annealingbefore temperature: 500 600 C (930 1110 F).Austenitizing temperature: 1000 1025 C(1830 1880 F) but usually 1020 C (1870 F).The steel should be heated through to theaustenitizing temperature and held at tem-perature for 30 the tool against decarburization andoxidation during the hardening MEDIA Vacuum with sufficient positive pressure High speed gas/circulating atmosphereIn order to obtain the optimum properties,the cooling rate should be as fast as possiblewithin acceptable distortion limits.

8 Temper thetool as soon as its temperature reaches 50 70 C (120 160 F).TEMPERINGC hoose the tempering temperature accordingto the hardness required by reference to thetempering graph. Temper minimum twice withintermediate cooling to room tempering temperature 250 C (480 F).Holding time at temperature minimum2 GRAPHThe tempering curve is , HRC54525048464442403836343230200 250 300 350 400 450 500 550 600 C390 480 570 660 750 840 930 1020 1110 F Tempering temperatureAustenitizing temperature1020 C (1870 F)Above tempering curves are obtained after heat treatmentof samples with a size of 15 x 15 x 40 mm, cooling in forcedair.

9 Lower hardness can be expected after heat treatmentof tools and dies due to factors like actual tool size andheat treatment Mirrax 405 GRINDINGA general grinding wheel recommendation isgiven below. More information can be found inthe Uddeholm publication Grinding of toolsteel .Type of grinding Delivery conditionFace grinding straight wheelA 46 HVFace grinding segmentsA 36 GVCylindrical grindingA 60 KVInternal grindingA 60 JVProfile grindingA 120 JV Milling with carbideCutting data parameterRough millingFine millingCutting speed (vc)m/min80 120120 390390 490 Feed (fz) of cut (ap)

10 Mm2 5 designation ISOP20 P40P10 P20 USC6 C5C7 C6 Coated carbide Coated carbideor cermetMILLINGFACE AND SQUARE SHOULDER MILLING Type of end millCarbideHighCutting dataSolidindexablespeedparametercarbidei nsertsteelCuttingspeed (vc)m/min60 10080 12020 251) 330260 39066 82 Feed (fz) ) ) ) ) ) )CarbidedesignationISO P15 P40 USC6 C51) For coated high speed steel end mill vc = 25 30 m/min (82 98 )2) Depending on radial depth of cut and cutter diameterEND MILLING Drill diameter Cutting speed (vc) Feed (f) 5 3/16 10 12*33 39* 5 10 3/16 3/810 12*33 39* 15 3/8 5/810 12*33 39* 20 5/8 3/410 12*33 39* * For coated high speed steel drill vc= 16 18 m/min (52 59 )CARBIDE DRILL Type of drillCutting dataIndexable SolidCarbideparameterinsert carbidetip1)Cuttingspeed, (vc)m/min100 12080 10070 390260 333230 260 Feed, (f) ) ) ) ) ) )1)