EN ISO 15630-3:2019

SLOVENSKI STANDARD
01-maj-2019
Nadomešča:
SIST EN ISO 15630-3:2011
Jeklo za armiranje in prednapenjanje betona - Metode preskušanja - 3. del: Jeklo
za prednapenjanje (ISO 15630-3:2019, popravljena različica 2019-10)
Steel for the reinforcement and prestressing of concrete - Test methods - Part 3:
Prestressing steel (ISO 15630-3:2019, Corrected version 2019-10)
Stahl für die Bewehrung und das Vorspannen von Beton - Prüfverfahren - Teil 3:
Spannstahl (ISO 15630-3:2019, korrigierte Fassung 2019-10)
Aciers pour l'armature et la précontrainte du béton - Méthodes d'essai - Partie 3: Aciers
de précontrainte (ISO 15630-3:2019, Version corrigée 2019-10)
Ta slovenski standard je istoveten z: EN ISO 15630-3:2019
ICS:
77.140.15 Jekla za armiranje betona Steels for reinforcement of
concrete
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 15630-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 77.140.15 Supersedes EN ISO 15630-3:2010
English Version
Steel for the reinforcement and prestressing of concrete -
Test methods - Part 3: Prestressing steel (ISO 15630-
3:2019, Corrected version 2019-10)
Aciers pour l'armature et la précontrainte du béton - Stähle für die Bewehrung und das Vorspannen von
Méthodes d'essai - Partie 3: Aciers de précontrainte Beton - Prüfverfahren - Teil 3: Spannstähle (ISO 15630-
(ISO 15630-3:2019, Version corrigée 2019-10) 3:2019, korrigierte Fassung 2019-10)
This European Standard was approved by CEN on 26 November 2018.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 30 October 2019.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE N O R M A L I S A T IO N

EUROPÄISCHES KOMITEE FÜR NORMUN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15630-3:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15630-3:2019) has been prepared by Technical Committee ISO/TC 17 "Steel" in
collaboration with Technical Committee CEN/TC 459/SC 4 “Concrete reinforcing and prestressing
steels” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2019, and conflicting national standards
shall be withdrawn at the latest by September 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 15630-3:2010.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 15630-3:2019, Corrected version 2019-10 has been approved by CEN as EN ISO 15630-
3:2019 without any modification.

INTERNATIONAL ISO
STANDARD 15630-3
Third edition
2019-02
Corrected version
2019-10
Steel for the reinforcement and
prestressing of concrete — Test
methods —
Part 3:
Prestressing steel
Aciers pour l'armature et la précontrainte du béton — Méthodes
d'essai —
Partie 3: Aciers de précontrainte
Reference number
ISO 15630-3:2019(E)
©
ISO 2019
ISO 15630-3:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 15630-3:2019(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
4 General provisions concerning test pieces . 3
5 Tensile test . 4
5.1 Test piece . 4
5.2 Test equipment . 4
5.3 Test procedure . 4
5.3.1 General. 4
5.3.2 Determination of the modulus of elasticity . 5
6 Bend test . 6
6.1 Test piece . 6
6.2 Test equipment . 6
6.3 Test procedure . 6
6.4 Interpretation of test results . 7
7 Reverse bend test . 7
7.1 Test piece . 7
7.2 Test equipment . 7
7.3 Test procedure . 8
8 Wrapping test. 8
8.1 Test piece . 8
8.2 Test equipment . 8
8.3 Test procedure . 8
9 Isothermal stress relaxation test . 9
9.1 Principle of test . 9
9.2 Test piece . 9
9.3 Test equipment .10
9.3.1 Frame .10
9.3.2 Force-measuring device .10
9.3.3 Length-measuring device (extensometer) .10
9.3.4 Anchoring device .10
9.3.5 Loading device .10
9.4 Test procedure .10
9.4.1 Provisions concerning the test piece .10
9.4.2 Application of force .10
9.4.3 Initial force .11
9.4.4 Force during the test . . .11
9.4.5 Maintenance of strain .11
9.4.6 Temperature .12
9.4.7 Frequency of force recording .12
9.4.8 Frequency of strain recording .12
9.4.9 Duration of the test .12
10 Axial force fatigue test .12
10.1 Principle of test .12
10.2 Test piece .13
10.3 Test equipment .13
10.4 Test procedure .13
10.4.1 Provisions concerning the test piece .13
ISO 15630-3:2019(E)
10.4.2 Stability of force and frequency .13
10.4.3 Counting of force cycles .14
10.4.4 Frequency .14
10.4.5 Temperature .14
10.4.6 Validity of the test .14
11 Stress corrosion test in a solution of thiocyanate .14
11.1 Principle of test .14
11.2 Sample and test piece .14
11.3 Test equipment .14
11.3.1 Frame .14
11.3.2 Force-measuring device .14
11.3.3 Time-measuring device .15
11.3.4 Test cell containing the test solution .15
11.3.5 Test solution.15
11.4 Test procedure .16
11.4.1 Provisions concerning the test pieces .16
11.4.2 Application and maintenance of force .16
11.4.3 Filling of the test cell.16
11.4.4 Temperature during the test .16
11.4.5 Termination of the test .16
11.4.6 Determination of median lifetime to fracture.16
12 Deflected tensile test .17
12.1 Principle of test .17
12.2 Sample and test pieces .17
12.3 Test equipment .17
12.3.1 General description .17
12.3.2 Dimensions .17
12.3.3 Anchorages .18
12.3.4 Mandrel .18
12.3.5 Loading device .20
12.4 Test procedure .20
13 Chemical analysis .20
14 Measurement of the geometrical characteristics .20
14.1 Test piece .20
14.2 Test equipment .21
14.3 Test procedures .21
14.3.1 Rib measurements . .21
14.3.2 Indentation measurements .22
14.3.3 Lay length of strand (P).22
14.3.4 Straightness .22
15 Determination of the relative rib area (f ) .23
R
15.1 General .23
15.2 Calculation of f .23
R
15.2.1 Relative rib area .23
15.2.2 Simplified formulae .23
15.2.3 Formula used for the calculation of f .25
R
16 Determination of deviation from nominal mass per metre .25
16.1 Test piece .25
16.2 Accuracy of measurement .25
16.3 Test procedure .26
17 Test report .26
Annex A (informative) Options for agreement between the parties involved .27
Bibliography .28
iv © ISO 2019 – All rights reserved

ISO 15630-3:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by ISO/TC 17, Steel, Subcommittee SC 16, Steels for the reinforcement and
prestressing of concrete.
This third edition cancels and replaces the second edition (ISO 15630-3:2010), which has been
technically revised. Changes have been introduced in the Introduction, Clauses 1 and 2, 5.3.1, 5.3.2, 9.3,
9.4.4, 10.4.3, 11.4 (now 10.3, 10.4.4, 11.4.3, 12.4) and Figure 8. The Bibliography has been updated and
the dated references have been replaced by undated references. A new Clause 8 on the wrapping test
has been added.
A list of all parts in the ISO 15360 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
This corrected version of ISO 15630-3:2019 incorporates the following corrections:
— in Figure 8, 60° ± 12° has been corrected to 60° ± 12′.
ISO 15630-3:2019(E)
Introduction
The aim of ISO 15630 (all parts) is to provide all relevant test methods for reinforcing and prestressing
steels in one standard series.
This document covers standard test methods, as well as specialized test methods that are not
commonly used in routine testing and that should only be considered where relevant (or specified) in
the applicable product standard.
Reference is made to International Standards on the testing of metals, in general, as they are applicable.
Complementary provisions have been given if needed.
vi © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 15630-3:2019(E)
Steel for the reinforcement and prestressing of concrete —
Test methods —
Part 3:
Prestressing steel
1 Scope
This document specifies test methods applicable to prestressing steel (bar, wire or strand) for concrete.
This document does not cover the sampling conditions that are dealt with in the product standards.
A list of options for agreement between the parties involved is provided in Annex A.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 4957, Tool steels
ISO 4965-1, Metallic materials — Dynamic force calibration for uniaxial fatigue testing — Part 1:
Testing systems
ISO 4965-2, Metallic materials — Dynamic force calibration for uniaxial fatigue testing — Part 2: Dynamic
calibration device (DCD) instrumentation
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 7801, Metallic materials — Wire — Reverse bend test
ISO 7802, Metallic materials — Wire — Wrapping test
ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing
ISO 16020, Steel for the reinforcement and prestressing of concrete — Vocabulary
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 16020 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
ISO 15630-3:2019(E)
For the purposes of this document, the following symbols apply.
Symbol Unit Description Reference
a mm Rib height at the mid-point 14.3, 15.2
m
a mm Maximum height of rib or depth of indentation 14.3
max
a mm Average height of a portion i of a rib subdivided into p parts of length Δl 15.2
s,i
a mm Rib height at the quarter-point 14.3, 15.2
1/4
a mm Rib height at the three-quarters point 14.3, 15.2
3/4
A % Percentage elongation after fracture 5.1, 5.3
A % Percentage total extension at maximum force Clause 5
gt
A % Percentage uniform elongation after fracture 5.3
r
b mm Width of transverse rib at the mid-point 14.3.1.6
c mm Rib or indentation spacing 14.3
C mm Groove width at nominal diameter of the mandrel, d , used for the deflect- 12.3.4
a
ed tensile test
d mm Nominal diameter of the bar, wire or strand 5.3.1, 7.2,
Table 3, 10.4.6,
Table 4
d mm Nominal diameter of the mandrel used for the deflected tensile test 12.3.4
a
d mm Diameter to be obtained after placing two gauge cylinders in the groove of 12.3.4
b
the mandrel used for the deflected tensile test
d mm Diameter of the gauge cylinder used for the deflected tensile test 12.3.4
e
d mm Diameter of guide hole 7.2
g
d mm Inner diameter of the groove of the mandrel used for the deflected ten- 12.3.4
i
sile test
D % Average coefficient of reduction of the maximum force in the deflected 12.2, 12.4
tensile test
D mm Inner diameter of the test cell in the stress corrosion test 11.3.4
c
D % Individual percentage of reduction of the maximum force in the deflected 12.4
i
tensile test
D mm Diameter of the mandrel of the bending device in the bend test Figure 2
m
e mm Average gap between two adjacent ribs or indentation rows 14.3.1.4,
14.3.2.5
E MPa Modulus of elasticity 5.2, 5.3
f Hz Frequency of force cycles in the axial force fatigue test 10.1, 10.4.2
f — Relative rib area Clause 15
R
F N Individual breaking force in the deflected tensile test 12.4
a,i
F N Maximum force in the tensile test 5.3
m
N Mean value of the maximum force 9.2, 11.2, 12.2,
F
12.4
m
F N 0,1 % proof force, plastic extension 5.2, 5.3
p0,1
F N 0,2 % proof force, plastic extension 5.2, 5.3
p0,2
F N Force range in the axial force fatigue test Figure 6, 10.3,
r
10.4.2
F N Residual force in the test piece at time t in the isothermal stress relaxa- 9.1
rt
tion test
ΔF N Force loss in the test piece at time t in the isothermal stress relaxation test 9.1
rt
F mm Area of longitudinal section of one rib 15.2
R
NOTE  1 MPa = 1 N/mm .
2 © ISO 2019 – All rights reserved

ISO 15630-3:2019(E)
Symbol Unit Description Reference
F N Upper force in the axial force fatigue test Figure 6, 10.3,
up
10.4.2
F N Initial force in the isothermal stress relaxation test and the stress corro- 9.1, 9.2, 9.3, 9.4,
sion test 11.1, 11.2, 11.4.2
G mm Depth of the groove of the mandrel used for the deflected tensile test 12.3.4
h mm Distance from the top tangential plane of cylindrical supports to the bot- 7.2
tom face of the guide
h mm Bow height in the plane of the bow 14.3.4
b
l mm Length of indentation 14.3.2.4
L mm Length of the test piece in the stress corrosion test 11.2
t
L mm Gauge length (without force on the test piece) in the isothermal stress 9.1, 9.3, 9.4
relaxation test
11.2, 11.3.4,
Length of the test piece in contact with the solution in the stress corro- 11.4.1, 11.4.3,
sion test 11.4.5
L mm Length of the passive side in the deflected tensile test 12.3.2
L mm Length of the active side in the deflected tensile test 12.3.2
m, n — Coefficients or numbers 9.4.9, 14.3, 15.2
P mm Lay length of a strand 14.3.3
r mm Radius of cylindrical supports 7.2
R mm Radius at the base of the mandrel used for the deflected tensile test 12.3.4
r mm Distance between the grips and the gauge length for the manual measure- 5.3
ment of A
gt
r mm Distance between the fracture and the gauge length for the manual meas- 5.3
urement of A
gt
R µm Surface roughness of the mandrel used for the deflected tensile test 12.3.4
a
S mm Nominal cross-sectional area of the test piece 5.3.2
n
t h Maximum agreed time for the stress corrosion test 11.4.5
a
t h Individual lifetime to fracture in the stress corrosion test 11.4.5
f,i
t h Median lifetime to fracture in the stress corrosion test 11.4.6
f,m
t s Starting time in the isothermal stress relaxation test and in the stress 9.4.2, 11.4
corrosion test
y mm Distance from a plane, defined by the axes of the cylindrical supports, to Figure 3
the nearest point of contact with the test piece
V mm Volume of test solution to fill the test cell in the stress corrosion test 11.4.3
Z % Percentage reduction of area 5.3.1
α ° Angle of deviation in the deflected tensile test 12.3.2
β ° Rib or indentation angle to the bar or wire axis 14.3
— Value of the strain for a force equal to x F 5.3.2
m
ε
xF
m
ρ % Relaxation 9.4.9
14.3.1.4,
∑e mm Part of the circumference without indentation or rib
i
14.3.2.5, 15.2
NOTE  1 MPa = 1 N/mm .
4 General provisions concerning test pieces
Unless otherwise agreed or specified in the product standard, the samples shall be taken from the
finished product before packaging.
ISO 15630-3:2019(E)
Special care should be taken when samples are taken from the packaged product (e.g. coil or bundle) in
order to avoid plastic deformation, which could change the properties of the samples used to provide
the test pieces.
Specific complementary provisions concerning the test pieces are indicated in the relevant clauses of
this document, if needed.
5 Tensile test
5.1 Test piece
In addition to the general provisions given in Clause 4, the free length of the test piece shall be sufficient
for the determination of the percentage total extension at maximum force (A ) in accordance with 5.3.1.
gt
If the percentage elongation after fracture (A) is determined manually, the test piece shall be marked in
accordance with ISO 6892-1.
If the percentage total extension at maximum force (A ) is determined by the manual method for a
gt
bar or wire, equidistant marks shall be made on the free length of the test piece (see ISO 6892-1). The
distance between the marks shall be 20 mm, 10 mm or 5 mm, depending on the test piece diameter.
5.2 Test equipment
The test equipment shall be verified and calibrated in accordance with ISO 7500-1 and shall be at least
of class 1.
If an extensometer is used, it shall be of class 1 in accordance with ISO 9513 for the determination of E,
F or F ; for the determination of A , a class 2 extensometer (see ISO 9513) may be used.
p0,1 p0,2 gt
Grips shall be such as to avoid breaks in or very near the grips.
5.3 Test procedure
5.3.1 General
The tensile test for the determination of the modulus of elasticity (E), 0,1 % and 0,2 % proof force (F
p0,1
and F ), maximum force (F ), percentage total extension at maximum force (A ) and/or percentage
p0,2 m gt
elongation after fracture (A) and percentage reduction of area (Z) shall be performed in accordance
with ISO 6892-1.
An extensometer shall be used for the determination of the modulus of elasticity (E), 0,1 % and 0,2 %
proof force (F and F ) and percentage total extension at maximum force (A ). The extensometer
p0,1 p0,2 gt
gauge length shall be as specified in the relevant product standard.
Accurate values of A can only be obtained with an extensometer. If it is not possible to leave the
gt
extensometer on the test piece to fracture or until the maximum force has been passed, the extension
may be measured as follows.
— Continue loading until the extensometer records an extension just greater than the extension
corresponding to F , at which the extensometer is removed; the distance between the testing
p0,2
machine cross-heads is noted. The loading is continued until fracture occurs. The final distance
between the cross-heads is noted.
— The difference between the cross-head measurements is calculated as a percentage of the original
distance between the cross-heads and this value is added to the percentage obtained by the
extensometer.
4 © ISO 2019 – All rights reserved

ISO 15630-3:2019(E)
For wire and bars, it is also permissible to determine A by the manual method. If A is determined by
gt gt
the manual method after fracture, A shall be calculated from Formula (1):
gt
AA=+R /2 000 (1)
gt rm
where A is the percentage uniform elongation after fracture.
r
The measurement of A shall be made, as the measurement of A (see ISO 6892-1), on the longer of the
r
two fractured parts of the test piece on a gauge length of 100 mm, as close as possible to the fracture
but at a distance, r , of at least 50 mm or 2d (whichever is the greater) away from the fracture. This
measurement may be considered as invalid if the distance, r , between the grips and the gauge length is
less than 20 mm or d (whichever is the greater). See Figure 1.

a
Grip length.
b
Gauge length 100 mm.
Figure 1 — Measurement of A by the manual method
gt
It is preferable to apply a preliminary force to the test piece, e.g. to about 10 % of the expected maximum
force before placing the extensometer.
If A is not completely determined with an extensometer, this shall be indicated in the test report.
gt
For routine tests conducted by prestressing steel producers, the test information should be described
within internal documentation.
Tensile properties (F , F , F ) are recorded in force units.
p0,1 p0,2 m
For the determination of percentage elongation after fracture (A), the original gauge length shall be
eight times the nominal diameter (d), unless otherwise specified in the relevant product standard. In
case of dispute, A shall be determined manually.
If the fracture occurs within a distance of 3 mm from the grips, the test shall, in principle, be considered
as invalid and it shall be permissible to perform a retest. However, it shall be permitted to take into
account the test results if all values meet the relevant specified values.
5.3.2 Determination of the modulus of elasticity
The modulus of elasticity (E) shall be determined from the slope of the linear portion of the force-
extension diagram divided by the nominal cross-sectional area of the test piece (S ).
n
In general, for cold-drawn prestressing products (e.g. strands and plain wires), the slope can be
determined in the range between 0,2F and 0,7F , as shown by Formula (2):
m m
 
EF=−(,07 02,)FS/(εε− )/ (2)
mm 07,,FF02 n
 
 mm 
The slope may be calculated either by a linear regression of the measured data stored in a data storage
facility or by a best-fit visual technique over the above-defined portion of the recorded curve.
ISO 15630-3:2019(E)
In some special cases, e.g. hot-rolled and stretched bars, the above-mentioned method cannot be
applied; a secant modulus between 0,05F and 0,7F may then be determined as shown by Formula (3):
m m
 
(,07FF−−00,)5 /(εε )/S (3)
mm 07,,FF005 n
 
mm
 
In addition to the provisions given in 5.3.1, it shall be ensured that the stress rate is not changed within
the force range over which the modulus of elasticity is determined.
6 Bend test
6.1 Test piece
The general provisions given in Clause 4 apply.
6.2 Test equipment
6.2.1 A bending device, the principle of which is shown in Figure 2, shall be used.
NOTE Figure 2 shows a configuration where the mandrel and support rotate and the carrier is locked. It is
also possible that the carrier rotates and the support or mandrel is locked.
Key
1 mandrel
2 support
3 carrier
Figure 2 — Principle of a bending device
6.2.2 The bend test may also be performed using a device with supports and a mandrel (e.g.
see ISO 7438).
6.3 Test procedure
The bend test shall be performed at a temperature between 10 °C and 35 °C. The test piece shall be bent
over a mandrel.
The angle of bend and the diameter of the mandrel shall be in accordance with the relevant product
standard.
6 © ISO 2019 – All rights reserved
...