STAVAX ESR - Uddeholm

STAVAX ESRGeneralSTAVAX ESR is a premium grade stainless tool steelwith the following properties:• good corrosion resistance• good polishability• good wear resistance• good machinability• good stability in hardening.The combination of these properties gives a steelwith outstanding production performance. Thepractical benefits of good corrosion resistancein a plastics mould can be summarized as follows:• Lower mould maintenance costs.The surface of cavity impressions retain theiroriginal finish over extended running periods.Moulds stored or operated in humid conditionsrequire no special protection.• Lower production costs.Since water cooling channels are unaffected bycorrosion (unlike conventional mould steels),heat transfer characteristics, and thereforecooling efficiency, are constant throughout themould life, ensuring consistent cycle times.These benefits, coupled with the high wear resistanceof STAVAX ESR, offer the moulder lowmaintenance,long-life moulds for the greatestoverall moulding economy.Note! STAVAX ESR is produced using the Electro-Slag-Refining (ESR) technique, resulting in a verylow inclusion content.ApplicationsWhilst STAVAX ESR is recommended for all types ofmoulding tools, its special properties make itparticularly suitable for moulds with the followingdemands:• Corrosion/staining resistance, i.e. for mouldingof corrosive materials, e.g. PVC, acetates, andfor moulds subjected to humid working/storageconditions.• Wear resistance, i.e. for moulding abrasive/filled materials, including injection-mouldedthermosetting grades. STAVAX ESR is recommendedfor moulds with long production runs,e.g. disposable cutlery and containers.• High surface finish, i.e. for the production ofoptical parts, such as camera and sunglasseslenses, and for medical containers, e.g. syringes,analysis phials.RecommendedType of mouldhardness HRCInjection mould for:thermoplastic materials 45–54thermosetting materials 45–54Compression/transfer moulds 50–54Blow moulds for PVC, PET, etc. 45–54Extrusion, pultrusion dies 45–54Typical C Si Mn Cr Vanalysis % 0,38 0,9 0,5 13,6 0,3StandardspecificationDeliveryconditionColourcodeAISI 420 modifiedSoft annealed to approx. 200 HB.Orange/blackSTAVAX ESR core to makedisposable polystyrene beakers.Millions of close tolerance mouldingswith a very high surface finishhave been produced.3