SIST EN 10270-1:2002
(Main)Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire
Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire
1.1 This Part of EN 10270 applies to patented cold drawn unalloyed steel wire of circular cross-section for the manufacture of mechanical springs for static duty and dynamic duty applications.
1.2 In addition to this part of EN 10270 the general technical delivery requirements of EN 10021 are applicable.
Stahldraht für Federn - Teil 1: Patentiert-gezogener unlegierter Federstahldraht
Anwend ngsbereich
1.1 Dieser Teil von EN 10270 gilt für patentiert-gezogenen unlegierten Stahldraht mit rundem Querschnitt
zur Herstellung von Federn für statische und dynamische Beanspruchungen.
1.2 Zusätzlich zu diesem Teil der EN 10270 gelten die allgemeinen technischen Lieferbedingungen nach
EN 10021.
Fils en acier pour ressorts mécaniques - Partie 1: Fils pour ressorts en acier non allié, patentés, tréfilés a froid
Domaine d'application
1.1 La présente partie 1 de l'EN 10270 s'applique aux fils, en acier non allié, patentés et tréfilés a froid, de section circulaire, utilisés pour la fabrication de ressorts mécaniques pour usages statiques et dynamiques.
1.2 Les conditions générales techniques de livraison données dans l'EN 10021 s'ajoutent aux dispositions de la présente partie de l'EN 10270.
Jeklena žica za vzmeti - 1. del: Patentirana hladno vlečena nelegirana jeklena žica za vzmeti
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stahldraht für Federn - Teil 1: Patentiert-gezogener unlegierter FederstahldrahtFils en acier pour ressorts mécaniques - Partie 1: Fils pour ressorts en acier non allié, patentés, tréfilés a froidSteel wire for mechanical springs - Part 1: Patented cold drawn unalloyed 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 10270-1:2001SIST EN 10270-1:2002en01-september-2002SIST EN 10270-1:2002SLOVENSKI
STANDARD
SIST EN 10270-1:2002
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10270-1April 2001ICS 77.140.25; 77.140.65English versionSteel wire for mechanical springs - Part 1: Patented cold drawnunalloyed spring steel wireFils en acier pour ressorts mécaniques - Partie 1: Fils pourressorts en acier non allié, patentés, tréfilés à froidStahldraht für Federn - Teil 1: Patentiert-gezogenerunlegierter FederstahldrahtThis 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 10270-1:2001 ESIST EN 10270-1:2002
Page 2EN 10270-1:2001ContentsForeword.31Scope.42Normative references.43Terms and definitions.54Classification and designation.54.1Classification.54.2Designation.55Information to be supplied by the purchaser.66Requirements.66.1Material.66.2Form of delivery.76.3Coating and surface finish.76.4Mechanical properties.76.5Technological properties.136.6Supply conditions of wire on coils/reels and spools.146.7Surface quality.176.8Dimensions and dimensional tolerances.187Testing and inspection.197.1Inspection and inspection documents.197.2Extent of testing for specific inspection.207.3Sampling.207.4Test methods.207.5Retests.228Marking and packaging.22Annex A (informative) Additional information.24SIST EN 10270-1:2002
Page 3EN 10270-1:2001ForewordThis 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 10270-1:2002
Page 4EN 10270-1:20011 Scope1.1This Part of EN 10270 applies to patented cold drawn unalloyed steel wire of circular cross-section for the manufacture of mechanical springs for static duty and dynamic duty applications.1.2In addition to this part of EN
10270 the general technical delivery requirements of EN 10021are applicable.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 10016-1, Non alloy steel rod for drawing and/or cold rolling — Part 1: General requirementsEN 10016-2, Non alloy steel rod for drawing and/or cold rolling — Part 2: Specific requirements forgeneral purposesEN 10016-4, Non alloy steel rod for drawing and/or cold rolling — Part 4: Specific requirements for rodfor special applicationsEN 10021, General technical delivery requirements for steel and iron productsEN 10052, Vocabulary of heat treatments terms for ferrous 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 tolerancesEN 10244-2, Non-ferrous metallic coatings on wire — Part 2: Zinc and zinc alloy coatings for steelwire and productsCR 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 decarburization 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 appliedSIST EN 10270-1:2002
Page 5EN 10270-1:20013 Terms and definitionsFor the purposes of this standard the following term and definition apply:3.1patented cold drawn wirewire drawn to size by cold deformation of a starting material that has been subjected to a thermaltreatment of patenting (see EN 10052)4 Classification and designation4.1 ClassificationThe grade of spring wire used depends on the stress level and the nature of the duty. Where springsare subjected to static stresses or infrequent dynamic loading a wire grade for static duty (S) shall beused. In the other cases with frequent or predominantly dynamic loading and where small coilingratios or severe bending radius is required, a wire grade for dynamic duty (D) shall be used.Depending on the stress level, spring wire is manufactured in 3 tensile strength grades: Low, mediumand high.Table 1 gives an overview of the different grades.Table 1 — Spring wire gradesTensile strength aStaticDynamicLow tensile strengthSL-Medium tensile strengthSMDMHigh tensile strengthSHDHa For specific applications another tensile strength may be agreed.4.2 DesignationFor products supplied according to this standard the designation shall state in the following order: the term: spring wire; the number of this European Standard : EN 10270-1; the wire grade (see Table 1); the required nominal diameter selected from Table 3; the coating indicated by its abbreviation (see 6.3).EXAMPLE: Standard designation of a steel spring wire according to this standard of spring wire gradeSM, with a nominal diameter of 2,50 mm, phosphate coated :Spring wire EN 10270-1 - SM - 2,50 ph.SIST EN 10270-1:2002
Page 6EN 10270-1:20015 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 10270-1;c) wire grade; coating and surface finish (see 6.3);d) the nominal wire diameter;e) the form of delivery and unit mass (see 6.2);f) the type of inspection document;g) any particular agreement made.EXAMPLE5 t spring steel wire EN 10270-1 - SM - 2,50 ph.on spools of about 500 kg.inspection document EN 10204-3.1.B6 Requirements6.1 Material6.1.1 GeneralSteel spring wire shall be made from steel corresponding to EN 10016-1 with in addition for SL, SM and SHEN 10016-2 for DM and DHEN 10016-46.1.2 Chemical compositionThe chemical composition according to the heat analysis shall comply with the limit values shown inTable 2. The permissible deviation of the product analysis from the heat analysis shall be inaccordance with EN 10016-2 and EN 10016-4 respectively.SIST EN 10270-1:2002
Page 7EN 10270-1:2001Table 2 — Chemical composition, % by massGradeC aSiMn bPSCumax.max.max.SL, SM, SH0,35-1,000,10-0,300,50-1,200,0350,0350,20DM, DH0,45-1,000,10-0,300,50-1,200,0200,0250,12a Such a wide range is stipulated to accommodate the whole range of sizes. For individual sizesthe carbon range is substantially more restricted.b The range of manganese content in the table is wide to cope with various processing situations andthe broad size range. The actual figures per size shall be more restricted.The addition of micro-alloying elements may be agreed between the manufacturer and the purchaser.NOTESome diameter ranges require particular attention for residuals. Therefore no figures are mentioned forchromium, nickel, molybdenum, tin, etc. leaving room for special arrangements between purchaser and supplier,dependent on their mutual processing conditions. This is also the case for the aluminium content.6.2 Form of deliveryThe wire shall be delivered in unit packages of a coil, individualized or on carriers, or a spool orspoolless core or as straight lengths.Unless otherwise agreed at the time of ordering, the form of delivery will be coils; straight lengths shallbe supplied in bundles.6.3 Coating and surface finishThe spring wire may be supplied phosphate coated (ph) either dry drawn or wet drawn, copper coated(cu), zinc (Z) or zinc/aluminium (ZA) coated.Other coatings, considered as special, can be agreed between the purchaser and the supplier(see annex A).If no specific surface finish is specified, the type of finish shall be at the manufacturer’s discretion.In addition the wire can be ordered with an oiled surface for all surface finishes.6.4 Mechanical propertiesFor the tensile strength (Rm) and reduction in area after fracture (Z) the wire grades shall satisfy thevalues listed in Table 3. Reduction of area shall be measured only for wire diameter 0,80 mm andabove.The range of tensile strength values within a unit package shall not exceed the values of Table 4.SIST EN 10270-1:2002
Page 8EN 10270-1:2001Table 3 — Mechanical properties a b and quality requirements for wire grades SL, SM, DM, SH and DH12345678910111213Wire diameter daMassTensile strength Rm c d eMinimumMinimumPermissiblePermissibleWirekg/1000 mFor wire gradesreduction innumber ofdepth ofdecarburi-diameter darea aftertwists in thesurfacezation depth(nominalfracture Ztorsion test fordefects forfor wiresize)for wirewire gradeswire gradesgradesgradesSL, SM, SH, DMDM, DHDM, DHSL, SM, SH,and DHDM and DHNominalPermissibleSLSMDMSHDHfsizeDeviationsMPaMPaMPaMPaMPa%dmmmmmmmmmm0,050,01542800 to 35200,050,060,02222800 to 35200,060,07± 0,0030,03022800 to 35200,070,080,03952800 to 34800,080,090,04992800 to 34300,090,100,06172800 to 33800,100,110,07462800 to 33500,110,12± 0,0040,08882800 to 33200,120,140,1212800 to 32500,140,160,1582800 to 3200coiling test as- g- g0,160,180,2002800 to 3160specified in0,180,20± 0,0050,2472800 to 31107.4.30,200,220,2982770 to 30800,220,250,3852720 to 30100,250,280,4882680 to 29700,280,300,5552370 to 26502370 to 26502660 to 29402660 to 29400,300,32± 0,0080,6312350 to 26302350 to 26302640 to 29202640 to 29200,320,340,7132330 to 26002330 to 26002610 to 28902610 to 28900,340,360,7992310 to 25802310 to 25802590 to 28702590 to 28700,360,380,8902290 to 25602290 to 25602570 to 28502570 to 28500,38SIST EN 10270-1:2002
Page 9EN 10270-1:2001Table 3 — Mechanical properties a b and quality requirements for wire grades SL, SM, DM, SH and DH (continued)12345678910111213Wire diameter daMassTensile strength Rm c d eMinimumMinimumPermissiblePermissibleWirekg/1000 mFor wire gradesreduction innumber ofdepth ofdecarburi-diameter darea aftertwists in thesurfacezation depth(nominalfracture Ztorsion test fordefects forfor wiresize)for wirewire gradeswire gradesgradesgradesSL, SM, SH,DM, DHDM, DHSL, SM, SH,DM and DHDM and DHNominalPermissibleSLSMDMSHDHfsizeDeviationsMPaMPaMPaMPaMPa%dmmmmmmmmmm0,400,9852270 to 25502270 to 25502560 to 28302560 to 28300,400,431,142250 to 25202250 to 25202530 to 28002530 to 28000,430,451,252240 to 25002240 to 25002510 to 27802510 to 27800,450,481,422220 to 24802220 to 24802490 to 27602490 to 27600,480,50± 0,0081,542200 to 24702200 to 24702480 to 27402480 to 2740coiling test0,500,531,732180 to 24502180 to 24502460 to 27202460 to 2720as0,530,561,932170 to 24302170 to 24302440 to 27002440 to 2700specified in- g- g0,560,602,222140 to 24002140 to 24002410 to 26702410 to 26707.4.30,600,632,452130 to 23802130 to 23802390 to 26502390 to 26500,630,652,602120 to 23702120 to 23702380 to 26402380 to 26400,650,70± 0,0103,022090 to 23502090 to 23502360 to 26102360 to 26100,700,753,472070 to 23202070 to 23202330 to 25802330 to 25800,750,803,952050 to 23002050 to 23002310 to 25602310 to 25600,800,85± 0,0154,452030 to 22802030 to 22802290 to 25302290 to 25300,850,904,992010 to 22602010 to 22602270 to 25102270 to 25100,900,955,592000 to 22402000 to 22402250 to 24902250 to 2490250,951,006,171720 to 19701980 to 22201980 to 22202230 to 24702230 to 24701,001,056,801710 to 19501960 to 22001960 to 22002210 to 24502210 to 24501 % max.1.5 % max.1,051,10± 0,0207,461690 to 19401950 to 21901950 to 21902200 to 24302200 to 243040of wireof wire1,101,208,881670 to 19101920 to 21601920 to 21602170 to 24002170 to 2400diameterdiameter1,20SIST EN 10270-1:2002
Page 10EN 10270-1:2001Table 3 — Mechanical properties a b and quality requirements for wire grades SL, SM, DM, SH and DH (continued)12345678910111213Wire diameter daMassTensile strength Rm c d eMinimumMinimumPermissiblePermissibleWirekg/1000 mFor wire gradesreduction innumber ofdepth ofdecarburi-diameter darea aftertwists in thesurfacezation depth(nominalfracture Ztorsion test fordefects forfor wiresize)for wirewire gradeswire gradesgradesgradesSL, SM, SH,DM, DHDM, DHSL, SM, SH,DM and DHDM and DHNominalpermissibleSLSMDMSHDHfsizeDeviationsMPaMPaMPaMPaMPa%dmmmmmmmmmm1,259,631660 to 19001910 to 21401910 to 21402150 to 23802150 to 23801,251,3010,421640 to 18901900 to 21301900 to 21302140 to 23702140 to 2370251,301,4012,081620 to 18601870 to 21001870 to 21002110 to 23402110 to 23401,401,50± 0,02013,901600 to 18401850 to 20801850 to 20802090 to 23102090 to 23101,501,6015,81590 to 18201830 to 20501830 to 20502060 to 22902060 to 22901,601,7017,81570 to 18001810 to 20301810 to 20302040 to 22602040 to 22601,701,8020,01550 to 17801790 to 20101790 to 20102020 to 22402020 to 22401,801,9022,31540 to 17601770 to 19901770 to 19902000 to 22202000 to 22201,902,0024,71520 to 17501760 to 19701760 to 19701980 to 22001980 to 22001 % max.1.5 % max.2,002,10± 0,02527,21510 to 17301740 to 19601740 to 19601970 to 21801970 to 218022of wireof wire2,102,2531,21490 to 17101720 to 19301720 to 19301940 to 21501940 to 215040diameterdiameter2,252,4035,51470 to 16901700 to 19101700 to 19101920 to 21301920 to 21302,402,5038,51460 to 16801690 to 18901690 to 18901900 to 21101900 to 21102,502,6041,71450 to 16601670 to 18801670 to 18801890 to 21001890 to 21002,602,8048,31420 to 16401650 to 18501650 to 18501860 to 20701860 to 20702,803,0055,51410 to 16201630 to 18301630 to 18301840 to 20401840 to 20403,003,20± 0,03063,11390 to 16001610 to 18101610 to 18101820 to 20201820 to 20203,203,4071,31370 to 15801590 to 17801590 to 17801790 to 19901790 to 19903,403,6079,91350 to 15601570 to 17601570 to 17601770 to 19701770 to 1970163,603,8089,01340 to 17401550 to 17401550 to 17401750 to 19501750 to 19503,80SIST EN 10270-1:2002
Page 11EN 10270-1:2001Table 3 — Mechanical properties a b and quality requirements for wire grades SL, SM, DM, SH and DH (continued)12345678910111213Wire diameter daMassTensile strength Rm c d eMinimumMinimumPermissiblePermissibleWirekg/1000 mFor wire gradesreduction innumber ofdepth ofdecarburi-diameter darea aftertwists in thesurfacezation depth(nominalfracture Ztorsion test fordefects forfor wiresize)for wirewire gradeswire gradesgradesgradesSL, SM, SH,DM, DHDM, DHSL, SM, SH,and DHDM and DHNominalpermissibleSLSMDMSHDHfsizeDeviationsMPaMPaMPaMPaMPa%dmmmmmmmmmm4,00± 0,03098,61320 to 15201530 to 17301530 to 17301740 to 19301740 to 19304,004,251111310 to 15001510 to 17001510 to 17001710 to 19001710 to 1900164,254,501251290 to 14901500 to 16801500 to 16801690 to 18801690 to 18804,504,75± 0,0351391270 to 14701480 to 16701480 to 16701680 to 18601680 to 1860124,755,001541260 to 14501460 to 16501460 to 16501660 to 18401660 to 18405,005,301731240 to 14301440 to 16301440 to 16301640 to 18201640 to 182035115,305,601931230 to 14201430 to 16101430 to 16101620 to 18001620 to 1800115,606,002221210 to 13901400 to 15801400 to 15801590 to 17701590 to 1770101 % max.1.5 % max.6,006,30± 0,0402451190 to 13801390 to 15601390 to 15601570 to 17501570 to 17509of wireof wire6,306,502601180 to 13701380 to 15501380 to 15501560 to 17401560 to 17409diameterdiameter6,507,003021160 to 13401350 to 15301350 to 15301540 to 17101540 to 171097,007,503471140 to 13201330 to 15001330 to 15001510 to 16801510 to 16807h7,508,003951120 to 13001310 to 14801310 to 14801490 to 16601490 to 16607h8,008,50± 0,0454451110 to 12801290 to 14601290 to 14601470 to 16301470 to 16306h8,509,004991090 to 12601270 to 14401270 to 14401450 to 16101450 to 16106h9,009,505591070 to 12501260 to 14201260 to 14201430 to 15901430 to 1590305h9,5010,00± 0,0506171060 to 12301240 to 14001240 to 14001410 to 15701410 to 15705h10,0010,506801220 to 13801220 to 13801390 to 15501390 to 155010,5011,00± 0,070746-1210 to 13701210 to 13701380 to 15301380 to 1530-11,0012,00± 0,0808881180 to 13401180 to 13401350 to 15001350 to 150012,00SIST EN 10270-1:2002
Page 12EN 10270-1:2001Table 3 — Mechanical properties a b and quality requirements for wire grades SL, SM, DM, SH and DH (continued)12345678910111213Wire diameter daMassTensile strength Rm c d eMinimumMinimumPermissiblePermissibleWirekg/1000 mFor wire gradesreduction innumber ofdepth ofdecarburi-diameter darea aftertwists in thesurfacezation depth(nominalfracture Ztorsion test fordefects forfor wiresize)for wirewire gradeswire gradesgradesgradesSL, SM, SHDM, DHDM, DHSL, SM, SH,, DM and DHDM and DHNominalpermissibleSLSMDMSHDHfsizeDeviationsMPaMPaMPaMPaMPa%dmmmmmmmmmm12,509631170 to 13201170 to 13201330 to 14801330 to 148012,5013,00± 0,08010421160 to 13101160 to 13101320 to 14701320 to 147013,0014,0012081130 to 12801130 to 12801290 to 14401290 to 144014,0015,0013871160 to 12601160 to 12601270 to 14101270 to 1410281 % max.1.5 % max.15,0016,001578-1090 to 12301090 to 12301240 to 13901240 to 1390-of wireof wire16,0017,00± 0,09017821070 to 12101070 to 12101220 to 13601220 to 1360diameterdiameter17,0018,0019981050 to 11901050 to 11901200 to 13401200 to 134018,0019,0022251030 to 11701030 to 11701180 to 13201180 to 132019,0020,00± 0,10024661020 to 11501020 to 11501160 to 13001160 to 130020,00a For intermediate values of wire diameter, the values specified for the next higher diameter shall apply (for tensile strength see c).b Wire with a size above 20 mm diameter is used. Where such wire is specified the parties shall agree upon the properties and requirements at the time of enquiry and order.c For sizes not mentioned the required strength shall be derived from the mathematical formulae given in A.4.d For straightened and cut lengths the tensile strength values may be up to 10 % lower, torsion values are also lowered by the straightening and cutting operation.e 1 MPa = 1 N/mm2.f For diameters 0,05 mm to 0,18 mm, a restricted tensile strength range of 300 MPa within the specified range may be agreed.g Because of the small wire diameter, measurement of the depth of defects or depth of decarburization can only be carried out with difficulty. For this reason, no maximum value is specified forthis diameter range.h Guideline values; not mandatory for acceptance.SIST EN 10270-1:2002
Page 13EN 10270-1:2001Table 4 — Permissible tensile strength range within a single unit package in MPaDiameter range (mm)SL, SM, SHDM, DHd <0,801501500,80
d < 1,601201001,60
d12070The requirements apply to unit packages the mass of which in kilograms does not exceed the value of250 x d (d= wire diameter in mm) or a maximum value of 1 000 kg.In cases of coils of greater mass, appropriate agreements shall be made.6.5 Technological properties6.5.1 Coiling testIn order to assess the uniformity of the wire in the coiling deformation and its surface condition, thecoiling test shall be carried out on wire with a diameter up to 0,70 mm for the grades DM, SH and DH.In the test as described further in 7.4.3 the test piece shall exhibit a defect-free surface without splitsor fracture, a uniform pitch of the turns after coiling and a fair dimensional regularity of its diameter.NOTEAlthough the usefulness of the coiling test is not generally recognized, it has been retained since itoffers the possibility of revealing internal stresses. If doubtful test results are obtained the wire concerned shouldnot be rejected immediately but efforts should be made by the parties concerned to elucidate the cause.6.5.2 Torsion testFor assessing the deformability, fracture behaviour and surface condition the torsion test shall becarried out for all wire grades on wires in the nominal diameter range over 0,70 mm to 10 mm. Theminimum number of turns specified in Table 3 for diameters up to 7,00 mm is mandatory. For wiresexceeding this size they shall be taken only as indicative values.In executing the test according to 7.4.5 the required number of turns shall be achieved before the testpiece fractures. The fracture of the torsion test piece shall be perpendicular to the wire axis (seeEN 10218-1:1994 - Types 1a, 2a or 3a).Spring back resilience cracks or spring back fractures (“spoon” or “secondary” fractures) are notconsidered in the evaluation. In each case a uniform distortion of both fragments shall be presentalthough the pitch of the turns need not be the same in the two parts. In the case of grade DH nosurface cracks visible to the naked eye shall be present after the torsion test (only type “1a” fracture isacceptable).6.5.3 Wrapping testThe wrapping test may be applied (see 7.4.4) to wire with a diameter equal or less than 3,00 mm. Thewire shall not show sign of fracture when close wrapped eight turns around a mandrel of a diameterequal to that of the wire.SIST EN 10270-1:2002
Page 14EN 10270-1:20016.5.4 Bend testWhere requested the bend test may be applied to wire with a diameter greater than 3,00 mm. Thewire shall withstand the test without any sign of failure.NOTEIn some applications the material is severely deformed by bending. Such is the case for extensionsprings with tight hooks, springs with bend on legs, spring wire forms, etc. In such cases the bend test providesfor a wire test very close to the actual use.6.6 Supply conditions of wire on coils/reels and spools6.6.1 GeneralThe wire of a unit package shall consist of one single length of wire originating from only one heat. Forgrades DM and DH only the welds prior to the last patenting operation are allowed; all other weldsshall be removed, or - if so agreed upon - properly marked.For the wire grades SL/SM/SH welds are allowed at the size of the last patenting treatment. For otherwelds, the treatment of the welds shall be subject to an arrangement between the parties involved,depending on wire diameter and application.6.6.2 Coil sizeThe coil internal diameter of coils shall at least satisfy the values given in Table 5, unless otherwiseagreed.Table 5 — Wire diameter and associated minimum coil internal diameterWire diameter a (mm)Minimum internal diameter (mm)0,25
d <0,281000,28
d < 0,501500,50
d < 0,701800,70
d < 1,602501,60
d < 4,504004,50
d500a For wire diameter below 0,25 mm specific agreements shall be made between the parties.SIST EN 10270-1:2002
Page 15EN 10270-1:20016.6.3 Cast of wireThe wire shall be uniformly cast. Unless otherwise specified the wap diameter of wire supplied incoils/reels may expand when the binding wires are removed, but should usually not retract to aninternal diameter smaller than the original cast diameter other than by agreement between supplierand purchaser. The expansion shall be approximately even within a single package and within all theunits in a production batch.6.6.4 Helix cast of wireThe wire shall be dead cast. The requirement shall be considered fulfilled in the case of wire finer than5,00 mm in diameter if the following condition is satisfied.An individual wap taken from a coil/reel or bobbin and freely hung on hook may show an axialdisplacement “f” at the ends of the wap (see Figure 1); this displacement "f" shall not exceed a valuegiven by the following equation :42,0dDfwherefis the axial displacement in mmDis the diameter of a free wap in mmdis the diameter of the wire in mmSIST EN 10270-1:2002
Page 16EN 10270-1:2001Figure 1 — Helix cast of wire6.6.5 Other tests for cast of wireWhere appropriate other methods for testing the cast, as specified in EN 10218-1, may be agreed atthe time of enquiry and order.SIST EN 10270-1:2002
Page 17EN 10270-1:20016.7 Surface quality6.7.1The surface of the wire shall be smooth and as free as possible from grooves, tears, rust andother surface defects, which have a noticeable adverse effect on the application of the wire.6.7.2Surface quality tests (see 7.4.7 and 7.4.8) shall be applied to wires intended for use indynamic duty springs only (DM and DH). The radial depth of the seams or other surface defects shall be not greater than 1% of thenominal diameter of the wire. The cross-section of spring wire grades DM and DH shall show no completely decarburized layer.Partial decarburization as indicated by grain boundary ferrite of an amount in excess of thatpresent in the main portion or “core” of the section, shall not have a radial depth greater than1,5% of the nominal diameter of the wire.6.7.3In the case of zinc or zinc/aluminium coated spring wire the amount of zinc or zinc/aluminiumon the wire surface shall satisfy the minimum values specified in Table 6.Other levels may be agreed between supplier and purchaser. The adherence of the coating shall betested by a wrapping test (see 7.4.11) according to EN 10244-2.NOTEThe usual coating processes may alter the properties of the steel wire. The ductility and endurance oft
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