SIST EN 10270-1:2012

SLOVENSKI STANDARD
oSIST prEN 10270-1:2008
01-september-2008
-HNOHQDåLFD]DY]PHWLGHO3DWHQWLUDQDKODGQRYOHþHQDQHOHJLUDQDMHNOHQDåLFD
]DY]PHWL
Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel
wire
Stahldraht für Federn - Teil 1: Patentiert gezogener unlegierter Federstahldraht
Fils en acier pour ressorts mécaniques - Partie 1: Fils pour ressorts en acier non allié,
patentés, tréfilés à froid
Ta slovenski standard je istoveten z: prEN 10270-1
ICS:
77.140.25 Vzmetna jekla Spring steels
77.140.65 Jeklene žice, jeklene vrvi in Steel wire, wire ropes and
verige link chains
oSIST prEN 10270-1:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10270-1:2008

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oSIST prEN 10270-1:2008
EUROPEAN STANDARD
DRAFT
prEN 10270-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2008
ICS 77.140.25 Will supersede EN 10270-1:2001
English Version
Steel wire for mechanical springs - Part 1: Patented cold drawn
unalloyed spring steel wire
Fils en acier pour ressorts mécaniques - Partie 1 : Fils pour Stahldraht für Federn - Teil 1: Patentiert gezogener
ressorts en acier non allié, patentés, tréfilés à froid unlegierter Federstahldraht
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ECISS/TC 30.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10270-1:2008: E
worldwide for CEN national Members.

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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .5
4 Classification and designation.5
5 Information to be supplied by the purchaser .6
6 Requirements.6
7 Testing and inspection.18
8 Marking and packaging.20
Annex A (informative) Additional information.22

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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
Foreword
This document (prEN 10270-1:2008) has been prepared by Technical Committee ECISS/TC 30 “steel wires”,
the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10270-1:2001.
This European Standard for steel wire for mechanical springs is composed of the following parts:
 Part 1: Patented cold drawn unalloyed spring steel wire
 Part 2: Oil hardened and tempered spring steel wire
 Part 3: Stainless spring steel wire
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
1 Scope
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.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
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 requirements.
EN 10016-2, Non-alloy steel rod for drawing and/or cold rolling — Part 2: Specific requirements for general
purposes rod.
EN 10016-4, Non-alloy steel rod for drawing and/or cold rolling — Part 4: Specific requirements for rod for
special applications.
EN 10021, General technical delivery requirements for steel products.
EN 10052, Vocabulary of heat treatments terms for ferrous products.
EN 10204, Metallic products — Types of inspection documents.
EN 10218-1, Steel wire and wire products — General — Part 1: Test methods.
EN 10218-2, Steel wire and wire products — General — Part 2: Wire dimensions and tolerances.
EN 10244-2, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 2: Zinc and
zinc alloy coatings.
CR 10261, Iron and steel — Review of available methods of chemical analysis.
EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing.
EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition (ISO 14284:1996).
EN ISO 3887, Steels — Determination of depth of decarburization.
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
patented cold drawn wire
wire drawn to size by cold deformation of a starting material that has been subjected to a thermal treatment of
patenting (see EN 10052), giving structure suitable for subsequent rolling or drawing
4 Classification and designation
4.1 Classification
The grade of spring wire used depends on the stress level and the nature of the duty. Where springs are
subjected to static stresses or infrequent dynamic loading a wire grade for static duty (S) shall be used. In the
other cases with frequent or predominantly dynamic loading and where small coiling ratios 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, medium and high.
Table 1 gives an overview of the different grades.
Table 1 — Spring wire grades
a
Static Dynamic
Tensile strength
Low tensile strength SL —
Medium tensile strength SM DM
High tensile strength SH DH
a
 For specific applications another tensile strength may be agreed.
4.2 Designation
For 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 grade SM, with a
nominal diameter of 2,50 mm, phosphate coated:
Spring wire EN 10270-1—SM—2,50 ph.
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
5 Information to be supplied by the purchaser
The 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.
EXAMPLE 5 t spring steel wire EN 10270-1—SM—2,50 ph.
on spools of about 500 kg;
inspection document EN 10204-3.1.b.
6 Requirements
6.1 Material
6.1.1 General
Steel spring wire shall be made from steel corresponding to EN 10016-1 with in addition:
 for SL, SM and SH EN 10016-2
 for DM and DH EN 10016-4
6.1.2 Chemical composition
The chemical composition according to the heat analysis shall comply with the limit values shown in Table 2.
The permissible deviation of the product analysis from the heat analysis shall be in accordance with
EN 10016-2 and EN 10016-4 respectively.
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)

Table 2 — Chemical composition, % by mass
a b, c)
Grade C Si Mn P S Cu
  max. max. max.
SL, SM, SH 0,35-1,00 0,10-0,30 0,40-1,20 0,035 0,035 0,25
DM, DH 0,45-1,00 0,10-0,30 0,40-1,20 0,020 0,025 0,12
a
Such a wide range is stipulated to accommodate the whole range of sizes. For individual sizes the carbon range is
substantially more restricted.
b
The range of manganese content in the table is wide to cope with various processing situations and the broad size range.
The actual figures per size shall be more restricted.
c
For the manganese content, a different range from the one indicated in the table may be agreed at the time of ordering, with
a maximum not exceeding 1,20 % and with an amplitude of 0,20 %.
The addition of micro-alloying elements may be agreed between the manufacturer and the purchaser.
NOTE Some diameter ranges require particular attention for residuals. Therefore no figures are mentioned for
chromium, 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 delivery
The wire shall be delivered in unit packages of a coil, individualized or on carriers, or a spool or spoolless core
or as straight lengths.
Unless otherwise agreed at the time of ordering, the form of delivery will be coils; straight lengths shall be
supplied in bundles.
6.3 Coating and surface finish
The 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 properties
For the tensile strength (R ) and reduction in area after fracture (Z) the wire grades shall satisfy the values
m
listed in Table 3. Reduction of area shall be measured only for wire diameter 0,80 mm and above.
The range of tensile strength values within a unit package shall not exceed the values of Table 4.
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
a b
Table 3 — Mechanical properties and quality requirements for wire grades SL, SM, DM, SH and DH
1 2 3 4 5 6 7 8 9 10 11 12 13
a c d e
Mass Minimum Minimum Permissible Permissible Wire
Wire diameter d Tensile strength R
m
kg/ reduction in number of depth of decarburi- diameter d
 For wire grades
area after twists in the surface zation depth (nominal
1 000 m
fracture Z torsion test for defects for for wire size)

for wire wire grades wire grades grades

grades SL, SM, SH, DM DM, DH DM, DH

d
SL, SM, SH,
and DH

DM and DH



f
Nominal Permissible SL SM DM SH
DH

size deviations


mm mm MPa MPa MPa MPa MPa % mm mm mm
0,05 0,0154   2800 to 3520   0,05
0,06 0,0222   2800 to 3520   0,06
0,07 ± 0,003 0,0302   2800 to 3520   0,07
0,08 0,0395   2800 to 3480   0,08
0,09 0,0499   2800 to 3430   0,09
0,10 0,0617   2800 to 3380   0,10
0,11 0,0746   2800 to 3350   0,11
0,12 0,0888   2800 to 3320   0,12
± 0,004
0,14 0,121   2800 to 3250   0,14
g g
0,16 0,158   2800 to 3200 coiling test as - - 0,16
0,18 0,200   2800 to 3160 specified in  0,18
0,20 ± 0,005 0,247   2800 to 3110 7.4.3  0,20
0,22 0,298   2770 to 3080   0,22
0,25 0,385   2720 to 3010   0,25
0,28 0,488   2680 to 2970   0,28
0,30 0,555 2370 to 2650 2370 to 2650 2660 to 2940 2660 to 2940   0,30
0,32 ± 0,008 0,631 2350 to 2630 2350 to 2630 2640 to 2920 2640 to 2920   0,32
0,34 0,713 2330 to 2600 2330 to 2600 2610 to 2890 2610 to 2890   0,34
0,36 0,799 2310 to 2580 2310 to 2580 2590 to 2870 2590 to 2870   0,36
0,38 0,890 2290 to 2560 2290 to 2560 2570 to 2850 2570 to 2850   0,38
"to be continued"
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
Table 3 (continued)
1 2 3 4 5 6 7 8 9 10 11 12 13
a c d e
Mass Minimum Minimum Permissible Permissible Wire
Wire diameter d Tensile strength R
m
kg/ reduction in number of depth of decarburi diameter d
 For wire grades
area after twists in the surface zation depth (nominal
1 000 m
size)
fracture Z torsion test for defects for for wire

for wire wire grades wire grades grades

grades SL, SM, SH, DM, DH DM, DH

 d
SL, SM, SH, DM and DH

DM and DH


f
Nominal Permissible SL SM DM SH
DH

size deviations


mm mm MPa MPa MPa MPa MPa % mm mm mm
0,40 0,985 2270 to 2550 2270 to 2550 2560 to 2830 2560 to 2830   0,40
0,43 1,14 2250 to 2520 2250 to 2520 2530 to 2800 2530 to 2800   0,43
0,45 1,25 2240 to 2500 2240 to 2500 2510 to 2780 2510 to 2780   0,45
0,48 1,42 2220 to 2480 2220 to 2480 2490 to 2760 2490 to 2760   0,48
0,50 ± 0,008 1,54 2200 to 2470 2200 to 2470 2480 to 2740 2480 to 2740 coiling test  0,50
0,53 1,73 2180 to 2450 2180 to 2450 2460 to 2720 2460 to 2720 as  0,53
g g
0,56 1,93 2170 to 2430 2170 to 2430 2440 to 2700 2440 to 2700 specified in - - 0,56
0,60 2,22 2140 to 2400 2140 to 2400 2410 to 2670 2410 to 2670 7.4.3  0,60
0,63 2,45 2130 to 2380 2130 to 2380 2390 to 2650 2390 to 2650   0,63
0,65 2,60 2120 to 2370 2120 to 2370 2380 to 2640 2380 to 2640   0,65
0,70 3,02 2090 to 2350 2090 to 2350 2360 to 2610 2360 to 2610   0,70
± 0,010
0,75 3,47 2070 to 2320 2070 to 2320 2330 to 2580 2330 to 2580   0,75
0,80 3,95 2050 to 2300 2050 to 2300 2310 to 2560 2310 to 2560   0,80
0,85 ± 0,015 4,45 2030 to 2280 2030 to 2280 2290 to 2530 2290 to 2530   0,85
0,90 4,99 2010 to 2260 2010 to 2260 2270 to 2510 2270 to 2510   0,90
0,95 5,59 2000 to 2240 2000 to 2240 2250 to 2490 2250 to 2490 25  0,95
1,00 6,17 1720 to 1970 1980 to 2220 1980 to 2220 2230 to 2470 2230 to 2470   1,00
1,05 6,80 1710 to 1950 1960 to 2200 1960 to 2200 2210 to 2450 2210 to 2450  1 % max. 1.5 % max. 1,05
1,10 ± 0,020 7,46 1690 to 1940 1950 to 2190 1950 to 2190 2200 to 2430 2200 to 2430 40 of wire of wire 1,10
1,20 8,88 1670 to 1910 1920 to 2160 1920 to 2160 2170 to 2400 2170 to 2400  diameter diameter 1,20
"to be continued"

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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
Table 3 (continued)
1 2 3 4 5 6 7 8 9 10 11 12 13
a c d e
Mass Minimum Minimum Permissible Permissible Wire
Wire diameter d Tensile strength R
m
kg/ reduction in number of depth of decarburi- diameter d
 For wire grades
area after twists in the surface zation depth (nominal
1 000 m
size)
fracture Z torsion test for defects for for wire

for wire wire grades wire grades grades

grades SL, SM, SH, DM, DH DM, DH

d
SL, SM, SH, DM and DH

DM and DH



f
Nominal Permissible SL SM DM SH
DH

size deviations


mm mm MPa MPa MPa MPa MPa % mm mm mm
1,25 9,63 1660 to 1900 1910 to 2140 1910 to 2140 2150 to 2380 2150 to 2380   1,25
1,30 10,42 1640 to 1890 1900 to 2130 1900 to 2130 2140 to 2370 2140 to 2370 25  1,30
1,40 12,08 1620 to 1860 1870 to 2100 1870 to 2100 2110 to 2340 2110 to 2340   1,40
1,50 ± 0,020 13,90 1600 to 1840 1850 to 2080 1850 to 2080 2090 to 2310 2090 to 2310   1,50
1,60 15,8 1590 to 1820 1830 to 2050 1830 to 2050 2060 to 2290 2060 to 2290   1,60
1,70 17,8 1570 to 1800 1810 to 2030 1810 to 2030 2040 to 2260 2040 to 2260   1,70
1,80 20,0 1550 to 1780 1790 to 2010 1790 to 2010 2020 to 2240 2020 to 2240   1,80
1,90 22,3 1540 to 1760 1770 to 1990 1770 to 1990 2000 to 2220 2000 to 2220   1,90
2,00 24,7 1520 to 1750 1760 to 1970 1760 to 1970 1980 to 2200 1980 to 2200  1 % max. 1.5 % max. 2,00
2,10 27,2 1510 to 1730 1740 to 1960 1740 to 1960 1970 to 2180 1970 to 2180 22 of wire of wire 2,10
± 0,025
2,25 31,2 1490 to 1710 1720 to 1930 1720 to 1930 1940 to 2150 1940 to 2150 40 diameter diameter 2,25
2,40 35,5 1470 to 1690 1700 to 1910 1700 to 1910 1920 to 2130 1920 to 2130   2,40
2,50 38,5 1460 to 1680 1690 to 1890 1690 to 1890 1900 to 2110 1900 to 2110   2,50
2,60 41,7 1450 to 1660 1670 to 1880 1670 to 1880 1890 to 2100 1890 to 2100   2,60
2,80 48,3 1420 to 1640 1650 to 1850 1650 to 1850 1860 to 2070 1860 to 2070   2,80
3,00 55,5 1410 to 1620 1630 to 1830 1630 to 1830 1840 to 2040 1840 to 2040   3,00
3,20 ± 0,030 63,1 1390 to 1600 1610 to 1810 1610 to 1810 1820 to 2020 1820 to 2020   3,20
3,40 71,3 1370 to 1580 1590 to 1780 1590 to 1780 1790 to 1990 1790 to 1990   3,40
3,60 79,9 1350 to 1560 1570 to 1760 1570 to 1760 1770 to 1970 1770 to 1970 16  3,60
3,80 89,0 1340 to 1740 1550 to 1740 1550 to 1740 1750 to 1950 1750 to 1950   3,80
"to be continued"
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)

Table 3 (continued)
1 2 3 4 5 6 7 8 9 10 11 12 13
a c d e
Mass Minimum Minimum Permissible Permissible Wire
Wire diameter d Tensile strength R
m
kg/ reduction in number of depth of decarburi- diameter d
 For wire grades
area after twists in the surface zation depth (nominal
1 000 m
fracture Z torsion test for defects for for wire size)

for wire wire grades wire grades grades

grades SL, SM, SH, DM, DH DM, DH

DM
SL, SM, SH,

d
and DH
DM and DH


f
Nominal Permissible SL SM DM SH
DH

size deviations

mm mm MPa MPa MPa MPa MPa % mm mm mm
4,00 98,6 1320 to 1520 1530 to 1730 1530 to 1730 1740 to 1930 1740 to 1930   4,00
± 0,030
4,25 111 1310 to 1500 1510 to 1700 1510 to 1700 1710 to 1900 1710 to 1900 16  4,25
4,50 125 1290 to 1490 1500 to 1680 1500 to 1680 1690 to 1880 1690 to 1880   4,50
4,75 ± 0,035 139 1270 to 1470 1480 to 1670 1480 to 1670 1680 to 1860 1680 to 1860 12  4,75
5,00 154 1260 to 1450 1460 to 1650 1460 to 1650 1660 to 1840 1660 to 1840   5,00
5,30 173 1240 to 1430 1440 to 1630 1440 to 1630 1640 to 1820 1640 to 1820 35 11  5,30
5,60 193 1230 to 1420 1430 to 1610 1430 to 1610 1620 to 1800 1620 to 1800 11  5,60
6,00 222 1210 to 1390 1400 to 1580 1400 to 1580 1590 to 1770 1590 to 1770 10 1 % max. 1.5 % max. 6,00
6,30 ± 0,040 245 1190 to 1380 1390 to 1560 1390 to 1560 1570 to 1750 1570 to 1750 9 of wire of wire 6,30
6,50 260 1180 to 1370 1380 to 1550 1380 to 1550 1560 to 1740 1560 to 1740 9 diameter diameter 6,50
7,00 302 1160 to 1340 1350 to 1530 1350 to 1530 1540 to 1710 1540 to 1710 9  7,00

h
7,50 347 1140 to 1320 1330 to 1500 1330 to 1500 1510 to 1680 1510 to 1680  7,50
7
h
8,00 395 1120 to 1300 1310 to 1480 1310 to 1480 1490 to 1660 1490 to 1660  8,00
7
h
8,50 ± 0,045 445 1110 to 1280 1290 to 1460 1290 to 1460 1470 to 1630 1470 to 1630  8,50
6
h
9,00 499 1090 to 1260 1270 to 1440 1270 to 1440 1450 to 1610 1450 to 1610  9,00
6
h
9,50 559 1070 to 1250 1260 to 1420 1260 to 1420 1430 to 1590 1430 to 1590 30  9,50
5
h
10,00 617 1060 to 1230 1240 to 1400 1240 to 1400 1410 to 1570 1410 to 1570  10,00
± 0,050
5
10,50 680 1220 to 1380 1220 to 1380 1390 to 1550 1390 to 1550   10,50
11,00 ± 0,070 746 - 1210 to 1370 1210 to 1370 1380 to 1530 1380 to 1530 -  11,00
12,00 888 1180 to 1340 1180 to 1340 1350 to 1500 1350 to 1500   12,00
± 0,080
"to be continued"
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Table 3 (concluded)
1 2 3 4 5 6 7 8 9 10 11 12 13
c d e
a
Mass Minimum Minimum Permissible Permissible Wire
Tensile strength R
Wire diameter d m
kg/
reduction in number of depth of decarburi- diameter d
 For wire grades
area after twists in the surface zation depth (nominal
1 000 m
size)
fracture Z torsion test for defects for for wire

for wire wire grades wire grades grades

DM, DH DM, DH
grades SL, SM, SH,

 d
DM and DH
SL, SM, SH,

DM and DH



f
Nominal Permissible SL SM DM SH
DH

size deviations

mm mm MPa MPa MPa MPa MPa % mm mm mm
12,50 963 1170 to 1320 1170 to 1320 1330 to 1480 1330 to 1480   12,50
13,00 1042 1160 to 1310 1160 to 1310 1320 to 1470 1320 to 1470   13,00
± 0,080
14,00 1208 1130 to 1280 1130 to 1280 1290 to 1440 1290 to 1440   14,00
15,00 1387 1160 to 1260 1160 to 1260 1270 to 1410 1270 to 1410 28 1 % max. 1.5 % max. 15,00
16,00 1578 - 1090 to 1230 1090 to 1230 1240 to 1390 1240 to 1390 - of wire of wire 16,00
17,00 ± 0,090 1782 1070 to 1210 1070 to 1210 1220 to 1360 1220 to 1360  diameter diameter 17,00
18,00 1998 1050 to 1190 1050 to 1190 1200 to 1340 1200 to 1340   18,00
19,00 2225 1030 to 1170 1030 to 1170 1180 to 1320 1180 to 1320   19,00
20,00 ± 0,100 2466 1020 to 1150 1020 to 1150 1160 to 1300 1160 to 1300   20,00
a
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.
2
e
1 MPa = 1 N/mm .
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 for
this diameter range.
h
Guideline values; not mandatory for acceptance.
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Table 4 — Permissible tensile strength range within a single unit package in MPa
Diameter range (mm) SL, SM, SH DM, DH
d < 0,80 150 150
0,80 ≤ d < 1,60 120 100
1,60 ≤ d 120 70
The requirements apply to unit packages the mass of which in kilograms does not exceed the value of 250 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 properties
6.5.1 Coiling test
In order to assess the uniformity of the wire in the coiling deformation and its surface condition, the coiling 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 splits or
fracture, a uniform pitch of the turns after coiling and a fair dimensional regularity of its diameter.
NOTE Although the usefulness of the coiling test is not generally recognized, it has been retained since it offers the
possibility of revealing internal stresses. If doubtful test results are obtained the wire concerned should not be rejected
immediately but efforts should be made by the parties concerned to elucidate the cause.
6.5.2 Torsion test
For assessing the deformability, fracture behaviour and surface condition the torsion test shall be carried out
for all wire grades on wires in the nominal diameter range over 0,70 mm to 10 mm. The minimum number of
turns specified in Table 3 for diameters up to 7,00 mm is mandatory. For wires exceeding 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 test piece
fractures. The fracture of the torsion test piece shall be perpendicular to the wire axis (see EN 10218-1 -
Types 1a, 2a or 3a).
Spring back resilience cracks or spring back fractures (“spoon” or “secondary” fractures) are not considered in
the evaluation. In each case a uniform distortion of both fragments shall be present although the pitch of the
turns need not be the same in the two parts. In the case of grade DH no surface cracks visible to the naked
eye shall be present after the torsion test (only type “1a” fracture is acceptable).
6.5.3 Wrapping test
The wrapping test may be applied (see 7.4.4) to wire with a diameter equal or less than 3,00 mm. The wire
shall not show sign of fracture when close wrapped eight turns around a mandrel of a diameter equal to that of
the wire.
6.5.4 Bend test
Where requested the bend test may be applied to wire with a diameter greater than 3,00 mm. The wire shall
withstand the test without any sign of failure.
NOTE In some applications the material is severely deformed by bending. Such is the case for extension springs with
tight hooks, springs with bend on legs, spring wire forms, etc. In such cases the bend test provides for a wire test very
close to the actual use.
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oSIST prEN 10270-1:2008
prEN 10270-1:2008 (E)
6.6 Supply conditions of wire on coils/reels and spools
6.6.1 General
The wire of a unit package shall consist of one single length of wire originating from only one heat. For grades
DM and DH only the welds prior to the last patenting operation are allowed; all other welds shall 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 other welds,
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 size
The coil internal diameter of coils shall at least satisfy the values given in Table 5, unless otherwise agreed.
Table 5 — Wire diameter and associated minimum coil internal diameter
a
Wire diameter (mm) Minimum internal diameter (mm)
100
0,25 ≤ d < 0,28
150
0,28 ≤ d < 0,50
0,50 ≤ d < 0,70 180
0,70 ≤ d < 1,60 250
1,60 ≤ d < 4,50 400
4,50 ≤ d 500
a
For wire diameter below 0,25 mm specific agreements shall be made between the parties.
6.6.3 Cast of wire
The wire shall be uniformly cast. Unless otherwise specified the wap diameter of wire supplied in coils/reels
may expand when the binding wires are removed, but should usually not retract to an internal diameter
smaller than the original cast diameter other than by agreement between supplier and purchaser. The
expansion shall be approximately even within a single package and within all the units in a production batch.
6.6.4 Helix cast of wire
The wire shall be dead cast. The requirement shall be considered fulfilled in the case of wire finer than
5,00 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 axial displacement “f”
at the ends of the wap (see Figure 1); this displacement "f" shall not exceed a value given by the following
equation:
0,2D
f ≤
4
d
where
f is the axial displacement in mm
D is the diameter of a free wap in mm
d is the diameter of the wire in mm
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oSIST prEN 10270-1:2008
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