SIST EN 10270-2:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stahldraht für Federn - Teil 2: Ölschlußvergüteter FederstahldrahtFils en acier pour ressorts mécaniques - Partie 2: Fils en acier trempés a l'huile et revenusSteel wire for mechanical springs - Part 2: Oil hardened and tempered spring steel wire77.140.65Jeklene žice, jeklene vrvi in verigeSteel wire, wire ropes and link chains77.140.25Vzmetna jeklaSpring steelsICS:Ta slovenski standard je istoveten z:EN 10270-2:2001SIST EN 10270-2:2002en01-september-2002SIST EN 10270-2:2002SLOVENSKI
STANDARD



SIST EN 10270-2:2002



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10270-2April 2001ICS 77.140.25; 77.140.65English versionSteel wire for mechanical springs - Part 2: Oil hardened andtempered spring steel wireFils en acier pour ressorts mécaniques - Partie 2: Fils enacier trempés à l'huile et revenusStahldraht für Federn - Teil 2: ÖlschlußvergüteterFederstahldrahtThis European Standard was approved by CEN on 19 February 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10270-2:2001 ESIST EN 10270-2:2002



Page 2EN 10270-2:2001Contents1Scope.42Normative references.43Terms and definitions.54Classification and designation.54.1Classification.54.2Designation.65Information to be supplied by the purchaser.66Requirements.66.1Form of delivery.66.2Surface finish.76.3Chemical composition.76.4Non metallic inclusions.76.5Mechanical properties.76.6Technological properties.136.7Surface quality.136.8Dimensions and dimensional
tolerances.147Testing and inspection.157.1Inspection and inspection documents.157.2Extent of testing for specific inspection.157.3Sampling.157.4Test methods.167.5Retests.178Marking and packaging.17Annex A (informative) Additional information.20SIST EN 10270-2:2002



Page 3EN 10270-2:2001ForewordThis European Standard has been prepared by Technical Committee ECISS/TC 30 "Steel wires ", thesecretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by October 2001, and conflicting national standardsshall be withdrawn at the latest by October 2001.This European Standard for steel wire for mechanical springs is composed of the following parts:Part 1 : Patented cold drawn unalloyed spring steel wirePart 2 : Oil hardened and tempered spring steel wirePart 3 : Stainless spring steel wireAccording to the CEN/CENELEC Internal Regulations, the national standards organizations of thefollowing countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 10270-2:2002



Page 4EN 10270-2:20011 Scope1.1This Part of EN 10270 applies to oil hardened and tempered spring steel wire made fromunalloyed or alloyed steels. They are primarily subject to torsional stresses such as in compressionand extension springs and in special cases also for applications where the spring wire is subject tobending stresses such as lever springs.As a rule unalloyed steels are used for applications at room temperature whereas alloyed steels aregenerally used at a temperature above room temperature. Alloyed steels may also be chosen forabove average tensile strengths.1.2In addition to this part of EN 10270 the general technical delivery requirements of EN 10021 areapplicable.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions of anyof these publications apply to this European Standard only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies (includingamendments).EN 10002-1, Metallic materials — Tensile test — Part 1: Method of test (at ambient temperature)EN 10021, General technical delivery requirements for steel and iron productsEN 10204, Metallic products — Types of inspection documentsEN 10218-1:1994, Steel wire and wire products — General — Part 1: Test methodsEN 10218-2:1996, Steel wire and wire products — General — Part 2: Dimensions and tolerancesENV 10247, Micrographic examination of the non-metallic inclusion content of steels using standardpicturesCR 10261, Iron and steel — Review of available methods of chemical analysisEN ISO 377, Steel and steel products — Location and preparation of samples and test pieces formechanical testingISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemicalcompositionEU 1041), Determination of the decarburzation depth of unalloyed and low alloyed structural steels
1)It may be agreed at the time of ordering, until this EURONORM has been adopted as a European Standard,that either this EURONORM or a corresponding national standard should be applied.SIST EN 10270-2:2002



Page 5EN 10270-2:20013 Terms and definitionsFor the purposes of this standard the following terms and definition apply.3.1oil hardened and tempered spring steel wirewire that is heat treated in line in the following way: it is first transformed into austenite, quenched inoil or similar quenching medium, followed immediately by tempering by heating to the appropriatetemperature4 Classification and designation4.1 ClassificationThis standard deals with all types of hardened and tempered spring steel wire. The grade for normalapplications made from unalloyed or alloyed steel has the abbreviation FD and is intended for staticapplications.Spring steel wire for medium fatigue levels, such as required for some clutch springs from unalloyedor alloyed steel, has the abbreviation TD.Spring steel wire from unalloyed steel or alloyed steel intended for use under severe dynamic dutysuch as for valve springs or other springs with similar requirements has the abbreviation VD.The diameter ranges for the various wire grades are shown in Table 1.Table 1 — Spring wire gradesTensile strengthStaticMedium fatigueHigh fatiqueLow
tensile strengthFDCTDCVDCMedium tensile strengthFDCrVTDCrVVDCrVHigh tensile strengthFDSiCrTDSiCrVDSiCrDiameter range (mm)0,50 - 17,000,50 - 10,000,50 - 10,00Medium and high fatigue grades TD and VD are characterized by high steel cleanliness, specificchemical, mechanical and technological parameters and a well defined surface condition in relation tothe allowable depth of surface defects and decarburization.SIST EN 10270-2:2002



Page 6EN 10270-2:2001The static grade FD is characterized by its chemical, mechanical and technological characteristics aswell as by a specified surface condition concerning surface defects and decarburization.4.2 DesignationFor products supplied according to this standard the designation shall state the following in thefollowing order: the term: spring wire; the number of this European Standard : EN 10270-2; the abbreviation for the wire grade (see Table 1); the required nominal diameter selected from Table 4 or Table 5;EXAMPLE: Standard designation of an oil hardened and tempered steel spring wire according to thisstandard of wire grade VDC with a nominal diameter of 2,50 mm :Spring wire EN 10270-2 - VDC - 2,50.5 Information to be supplied by the purchaserThe purchaser shall clearly state in his enquiry or order the product and following information :a) the desired quantity;b) the number of this European Standard: EN 10270-2;c) wire grade (see 4.1);d) the nominal wire diameter;e) the form of delivery and unit mass;f) the type of inspection document;g) any particular agreement made.EXAMPLE:5 t spring wire EN 10270-2 - VDC - 2,50in coils of about 300 kginspection document EN 10204 - 3.1.B.6 Requirements6.1 Form of delivery6.1.1Oil hardened and tempered wire shall be supplied in coils, on spools or in cut lengths. Thewire in coils or on spools shall form one continuous length. Wire in coil may also be supplied oncarriers containing one or more coils.SIST EN 10270-2:2002



Page 7EN 10270-2:2001For ‘VD’ and ‘TD’ grades no welds are permitted after the heat treatments preceding the final drawingoperation; for ‘FD’ grades no welds shall be made at finished size unless agreed otherwise betweenthe parties.6.1.2The supplied wire units shall be tightly bound to ensure that wire spiral waps do not spring outunforeseen. The starting end shall be marked and at the coil ends the wire shall be covered with aprotective cap.6.2 Surface finishThe wire shall be protected against corrosion and mechanical damage. Unless otherwise specifiedthe wire shall be delivered in slightly oiled condition.6.3 Chemical compositionThe steel is characterized by the heat analysis which shall be in accordance with the values ofTable 2. The permissible deviation of the product analysis from the limiting values of heat analysisshall be in accordance with Table 3.6.4 Non metallic inclusionsThe ‘VD’ grades shall be checked for maximum size of inclusion according to ENV 10247. Theallowable level of inclusions shall be agreed between the parties at the enquiry and order.6.5 Mechanical propertiesFor tensile strength Rm and reduction in area after fracture (Z) the wire grades shall satisfy
the valueslisted in Tables 4 and 5. Reduction of area is measured only for size 1,00 mm and above (seeTables 4, 5 and 11).The range of the tensile strength values within a coil/reel shall not exceed 50 MPa for the grades ‘VD’,60 MPa for the grades ‘TD’ and 70 MPa for the grades ‘FD’.Table 2 — Chemical composition, % by massGradeCSiMn aP max.S max.Cu max.CrVVDC0,60-0,750,15-0,300,50-1,000,0200,0200,06bVDCrV0,62-0,720,15-0,300,50-0,900,0250,0200,060,40-0,600,15-0,25VDSiCr0,50-0,601,20-1,600,50-0,900,0250,0200,060,50-0,80TDC0,60-0,750,10-0,350,50-1,200,0200,0200,10bTDCrV0,62-0,720,15-0,300,50-0,900,0250,0200,100,40-0,600,15-0,25TDSiCr0,50-0,601,20-1,600,50-0,900,0250,0200,100,50-0,80FDC0,60-0,750,10-0,350,50-1,200,0300,0250,12bFDCrV0,62-0,720,15-0,300,50-0,900,0300,0250,120,40-0,600,15-0,25FDSiCr0,50-0,601,20-1,600,50-0,900,0300,0250,120,50-0,80a Manganese may be ordered with restricted range, but with a minimum range of 0,20 %b For heavy wire diameter (above 8,5 mm) chromium may be added up to 0,30 % for properthrough hardening.SIST EN 10270-2:2002



Page 8EN 10270-2:2001Table 3 — Permissible deviation of the product analysis from the limiting values for theheat analysisChemical elementWire gradePermissible deviation, % by massCAll 0,03SiSiCr 0,05other grades 0,03MnAll 0,04PAll+ 0,005SAll+ 0,005CuAll+ 0,02CrAll 0,05VAll 0,02SIST EN 10270-2:2002



Page 9EN 10270-2:2001Table 4 — Mechanical and technological properties and quality requirements for wire grades FDC, FDCrV and FDSiCr1234567891011Nominal wirePermissiblediameter (mm)deviationsTensile strength RmMinimum reduction in area after fracture Z for wireMinimum number of torsions for wire gradesammgradesFDC bFDCrV bFDSiCr bFDCFDCrVFDSiCrFDCFDCrVFDSiCrMPaMPaMPa%%%d = 0,501900 to 21002000 to 22002100 to 2300---0,50 < d
0,60± 0,0101900 to 21002000 to 22002100 to 2300---0,60 < d
0,801900 to 21002000 to 22002100 to 23000,80 < d
1,00± 0,0151860 to 20601960 to 21602100 to 23001,00 < d
1,301810 to 20101900 to 21002070 to 22601,30 < d
1,40± 0,0201790 to 19701870 to 20702060 to 22501,40 < d
1,601760 to 19401840 to 20302040 to 22201,
...