UDDEHOLM STAVAX ESR

1 UDDEHOLM STAVAX ESRSS-EN ISO 9001SS-EN ISO 14001 This information is based on our present state of knowledge and is intended to provide generalnotes on our products and their uses. It should not therefore be construed as a warranty ofspecific properties of the products described or a warranty for fitness for a particular according to EU Directive 1999/45/ECFor further information see our Material Safety Data Sheets .Edition 11, latest revised edition of this brochure is the English version,which is always published on our web site UDDEHOLMS ABNo part of this publication may be reproduced or transmitted for commercial purposeswithout permission of the copyright STAVAX ESRUDDEHOLM STAVAX ESRU ddeholm STAVAX ESR is a premium stainless mould steel for small andmedium inserts and cores.

2 UDDEHOLM STAVAX ESR combines corrosion andwear resistance with excellent polishability, good machinability and stabilityin maintenance requirement is reduced by assuring that core and cavitysurfaces retain their original finish over extended operating periods. Whencompared with non stainless mould steel, UDDEHOLM STAVAX ESR offerslower production costs by maintaining rust free cooling channels, assuringconsistent cooling and cycle classic stainless tool steel is the right choice when rust in productionis unacceptable and where requirements for good hygiene are high, aswithin the medical industry, optical industry and for other high qualitytransparent STAVAX ESR is a part of the UDDEHOLM Stainless Concept4 UDDEHOLM STAVAX ESRA pplicationsUddeholm STAVAX ESR is recommended for alltypes of moulding tools and its special proper-ties make it particularly suitable for mouldswith the following demands.

3 Corrosion/staining resistance, formoulding of corrosive materials, PVC,acetates, and for moulds subjected to humidworking/storage conditions. Wear resistance, for moulding abrasive/filled materials, including injection-mouldedthermosetting grades. UDDEHOLM STAVAX ESRis recommended for moulds with longproduction runs, disposable cutlery andcontainers. High surface finish, for the productionof optical parts, such as camera and sun-glasses lenses, and for medical containers, , analysis STAVAX ESR is a premium gradestainless tool steel with the following proper-ties: good corrosion resistance excellent polishability good wear resistance good machinability good stability in hardeningThe combination of these properties gives asteel with outstanding production perform-ance. The practical benefits of good corro-sion resistance in a plastics mould can besummarized as follows: Lower mould maintenance costsThe surface of cavity impressions retain theiroriginal finish over extended running stored or operated in humid condi-tions require no special protection.

4 Lower production costsSince water cooling channels are unaffectedby corrosion (unlike conventional mouldsteel), heat transfer characteristics, andtherefore cooling efficiency, are constantthroughout the mould life, ensuring consist-ent cycle benefits, coupled with the high wearresistance of UDDEHOLM STAVAX ESR, offer themoulder low-maintenance, long-life moulds forthe greatest overall moulding : UDDEHOLM STAVAX ESR is produced usingthe Electro-Slag-Refining (ESR) technique,resulting in a very low inclusion SiMnCrVanalysis % 420 modifiedDeliveryconditionSoft annealed to approx. 190 of mouldhardness HRCI njection mould for: thermoplastic materials45 52 thermosetting materials45 52 Compression/transfer moulds45 52 Blow moulds for PVC, PET, 52 Extrusion, pultrusion dies45 52 UDDEHOLM STAVAX ESR core to makedisposable polystyrene beakers.

5 Millions ofclose tolerance mouldings with a very highsurface finish have been STAVAX ESRP ropertiesPhysical dataHardened and tempered to 50 HRC. Data atroom and elevated C200 C400 CTemperature(68 F)(390 F)(750 F)Density, kg/m37 8007 7507 700 of elasticityN/mm2200 000190 000180 000tsi12 90012 30011 x x x 106 Coefficient of thermalexpansion / C from 20 C x x 10-6/ F from 68 F x 10-6 x 10-6 Thermalconductivity*W/m C162024 Btu in/(ft2h F)110138166 Specific heatJ/kg C460 Btu/lb, *Thermal conductivity is very difficult to measure. The scatter can be as high as 15%.THE INFLUENCE OF TEMPERING TEMPERATUREON CORROSION RESISTANCEI ncreasing corrosion resistanceCorrosionresistance10020030040 0500 600 C 210 390 570 750 930 1110 FTempering temperatureHeat TreatmentSoft annealingProtect the steel and heat through to 890 C(1630 F).

6 Then cool in the furnace at 20 C(40 F) per hour to 850 C (1560 F), then at10 C (20 F) per hour to 700 C (1290 F), thenfreely in rough machining the tool should beheated through to 650 C (1200 F), holdingtime 2 hours. Cool slowly to 500 C (930 F),then freely in temperature: 600 850 C (1110 1560 F).Austenitizing temperature: 1000 1050 C (1830 1920 F), but usually 1020 1030 C (1870 1885 F).Temperature Soaking time* Hardness before C Fminutestempering102018703056 2 HRC105019203057 2 HRC* Soaking time = time at hardening temperature after the tool is fully heated throughProtect the part against decarburization andoxidation during resistanceUddeholm STAVAX ESR is resistant to corrosiveattack by water, water vapour, weak organicacids, dilute solutions of nitrates, carbonatesand other tool made from UDDEHOLM STAVAX ESR willhave good resistance to rusting and stainingdue to humid working and storage conditionsand when moulding corrosive plastics undernormal production : Special protectants are not recom-mended during mould storage.

7 Many protect-ants are chloride based and may attack thepassive oxide film, resulting in pitting ols should be thoroughly cleaned and driedprior to STAVAX ESR shows the bestcorrosion resistance when tempered at lowtemperature and polished to a mirror strength at roomtemperatureThe tensile strength values are to be consid-ered as approximate only. All samples weretaken from a bar (in the rolling direction)25 mm (1") diameter. Hardened in oil from1025 10 C (1880 20 F) and tempered twiceto the hardness HRC45 HRCT ensile strength RmN/mm21 7801 420kp/mm2 180 145psi258 000206 000 Yield point Rp0,2N/mm21 3601 280kp/mm2 150 130psi197 000186 0006 UDDEHOLM STAVAX ESR12345678200018001600140012001000 800 600 400 20011001000 900 800 700 600 500 400 300 200100 F C1 10 100 1 000 10 000 100 000 Seconds1 10 100 1 000 Minutes1 10 100 Hours0,2 1,5 10 90 600 Air coolingof bars.

8 Mm1 10 100 1 000 10 000 100 000 Seconds1 10 100 1 000 Minutes1 10 100 Hours200018001600140012001000 800 600 400 20011001000 900 800 700 600 500 400 300 200100 F C Temp. Time Hardness C hours Cooling curve Hardness T800 500 No. HV10 = 980 C (1800 F)AC1s = 860 C (1580 F)PearliteMartensiteCarburesMsMfPearlite MartensiteBainiteCCT-GRAPHA ustenitizing temperature 1030 C (1890 F). Holding time 30 GRAPHA ustenitizing temperature 1030 C (1890 F). Holding time 30 = 980 C (1800 F)AC1s = 860 C (1580 F)7 UDDEHOLM STAVAX ESR 100 200 300 400 500 600 C 210 390 570 750 930 1110 F Tempering temperatureGrainsizeASTMT emperingChoose the tempering temperature accordingto the hardness required by reference to thetempering graph.

9 Temper twice with inter-mediate cooling to room 980 1000 1020 1040 1060 1080 C 1760 1795 1830 1870 1905 1940 1975 F Austenitizing temperatureRetained austenite % Hardness HRCHARDNESS, GRAIN SIZE ANDRETAINED austenite AS A FUNCTION OFTHE AUSTENITIZING TEMPERATURETEMPERING GRAPHH ardnessHRC6055504540353025 Retained austenite %1412108642 RetainedausteniteHolding time20 time60 C1020 CRetainedaustenite1030 CQuenching media Fluidized bed or salt bath at 250 550 C(480 1020 F), then cool in air blast Vacuum with sufficient positive pressure High speed gas/circulating atmosphereIn order to obtain optimum properties, thecooling rate should be as fast as is concomitantwith acceptable distortion. When heat treatingin a vacuum furnace, a 4 5 bar overpressure isrecommended.

10 Temper immediately when thetool reaches 50 70 C (120 160 F).Dimensional changesThe dimensional changes during hardening andtempering vary depending on temperatures,type of equipment and cooling media usedduring heat size and geometric shape of the tool isalso of essential importance. Thus, the toolshall always be manufactured with enoughworking allowance to compensate for dimen-sional changes. Use as a guideline forUddeholm STAVAX ESR provided that a stressrelief is performed between rough and semi-finished machining as recommended.+ + + + 200 300 400 500 600 700 C 210 390 570 750 930 1110 1290 F Tempering temperatureDimensional change %DURING TEMPERINGL owest tempering temperature 250 C (480 F).Holding time at temperature minimum2 that: tempering at 250 C (480 F) is recom-mended for the best combination of tough-ness, hardness and corrosion resistance the curves are valid for small samples,achieved hardness depends on mould size a combination of high austenitizing tempera-ture and low tempering temperature< 250 C (< 480 F) gives a high stress level inthe mould and should be avoidedAustenitizing tempering curves are obtained after heat treat-ment of samples with a size of 15 x 15 x 40 mm,cooling in forced air.