EN ISO 15630-1:2019

SLOVENSKI STANDARD
01-maj-2019
1DGRPHãþD
SIST EN ISO 15630-1:2011
Jeklo za armiranje in prednapenjanje betona - Metode preskušanja - 1. del:
Armaturne palice, drogovi in žica (ISO 15630-1:2019)
Steel for the reinforcement and prestressing of concrete - Test methods - Part 1:
Reinforcing bars, rods and wire (ISO 15630-1:2019)
Stähle für die Bewehrung und das Vorspannen von Beton - Prüfverfahren - Teil 1:
Bewehrungsstäbe, -walzdraht und -draht (ISO 15630-1:2019)
Aciers pour l'armature et la précontrainte du béton - Méthodes d'essai - Partie 1: Barres,
fils machine et fils pour béton armé (ISO 15630-1:2019)
Ta slovenski standard je istoveten z: EN ISO 15630-1:2019
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 15630-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 77.140.15 Supersedes EN ISO 15630-1:2010
English Version
Steel for the reinforcement and prestressing of concrete -
Test methods - Part 1: Reinforcing bars, rods and wire (ISO
15630-1:2019)
Aciers pour l'armature et la précontrainte du béton - Stähle für die Bewehrung und das Vorspannen von
Méthodes d'essai - Partie 1: Barres, fils machine et fils Beton - Prüfverfahren - Teil 1: Bewehrungsstäbe,
pour béton armé (ISO 15630-1:2019) Walzdraht und Draht (ISO 15630-1:2019)
This European Standard was approved by CEN on 26 November 2018.

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, 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 United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

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 15630-1:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15630-1:2019) has been prepared by Technical Committee ISO/TC 17 "Steel" in
collaboration with Technical Committee CEN/TC 459 “ECISS - European Committee for Iron and Steel
Standardization” 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 15630-1:2010.
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 15630-1:2019 has been approved by CEN as EN ISO 15630-1:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 15630-1
Third edition
2019-02
Steel for the reinforcement and
prestressing of concrete — Test
methods —
Part 1:
Reinforcing bars, rods and wire
Aciers pour l'armature et la précontrainte du béton — Méthodes
d'essai —
Partie 1: Barres, fils machine et fils pour béton armé
Reference number
ISO 15630-1:2019(E)
©
ISO 2019
ISO 15630-1:2019(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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
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 15630-1:2019(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 at room temperature . 4
5.1 Test piece . 4
5.2 Test equipment . 4
5.3 Test procedure . 4
6 Bend test . 5
6.1 Test piece . 5
6.2 Test equipment . 6
6.3 Test procedure . 6
6.4 Interpretation of test results . 6
7 Rebend test . 7
7.1 Test piece . 7
7.2 Test equipment . 7
7.2.1 Bending device . 7
7.2.2 Rebending device . 7
7.3 Test procedure . 7
7.3.1 General. 7
7.3.2 Bending . 8
7.3.3 Artificial ageing . 8
7.3.4 Rebending . 8
7.4 Interpretation of test results . 8
8 Axial force fatigue test . 9
8.1 Principle of test . 9
8.2 Test piece . 9
8.3 Test equipment . 9
8.4 Test procedure .10
8.4.1 Provisions concerning the test piece .10
8.4.2 Upper force (F ) and force range (F ) .10
up r
8.4.3 Stability of force and frequency .10
8.4.4 Counting of force cycles .10
8.4.5 Frequency .10
8.4.6 Temperature .10
8.4.7 Validity of the test .10
9 Chemical analysis .10
10 Measurement of the geometrical characteristics .11
10.1 Test piece .11
10.2 Test equipment .11
10.3 Test procedure .11
10.3.1 Heights of transverse ribs or depths of indentations .11
10.3.2 Height of longitudinal ribs (a′) .12
10.3.3 Transverse rib or indentation spacing (c) .12
10.3.4 Pitch (P) .12
10.3.5 Part of the circumference without ribs or indentations (Σe ) .12
i
10.3.6 Transverse rib or indentation angle (β) .12
10.3.7 Transverse rib flank inclination (α) .12
ISO 15630-1:2019(E)
10.3.8 Width of transverse rib or width of indentation (b) .13
11 Determination of the relative rib or indentation area (f or f ) .14
R P
11.1 General .14
11.2 Measurements .14
11.3 Calculation of f . .14
R
11.3.1 Relative rib area .14
11.3.2 Simplified formulae .14
11.3.3 Formula used for the calculation of f . .15
R
11.4 Calculation of f .15
P
11.4.1 Relative indentation area .15
11.4.2 Simplified formulae .16
11.4.3 Formula used for the calculation of f .17
P
12 Determination of deviation from nominal mass per metre .17
12.1 Test piece .17
12.2 Accuracy of measurement .17
12.3 Test procedure .17
13 Specialized tests .17
13.1 Tensile test at elevated temperature .17
13.1.1 General.17
13.1.2 Test piece .17
13.1.3 Test equipment .17
13.1.4 Test procedure .18
13.2 Tensile test at low temperature .18
13.2.1 General.18
13.2.2 Test piece .18
13.2.3 Test equipment .18
13.2.4 Test procedure .18
13.3 Cyclic inelastic load test .18
13.3.1 Principle of the test .18
13.3.2 Test piece .19
13.3.3 Test equipment .19
13.3.4 Test procedure .19
14 Test report .20
Annex A (informative) Options for agreement between the parties involved .21
Bibliography .22
iv © ISO 2019 – All rights reserved

ISO 15630-1:2019(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 15630-1:2010), which has been
technically revised. Changes have been introduced in the Introduction, Clause 2, Clause 3, Clause 4,
Clause 5 (only the title), 5.3, 6.3, 8.3, 8.4.5, 10.3.1.1, 10.3.1.2, 10.3.3 and 11.3.2 and Figure 6. A new
Clause 13 has been added for “specialized” tests. The Bibliography has been updated and the dated
references have been replaced by undated references.
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.
ISO 15630-1:2019(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 (see Clauses 5 to 12), as well as specialized test methods
(gathered in Clause 13) 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 15630-1:2019(E)
Steel for the reinforcement and prestressing of concrete —
Test methods —
Part 1:
Reinforcing bars, rods and wire
1 Scope
This document specifies chemical and mechanical test methods and measurement methods of
geometrical characteristics applicable to reinforcing bars, rods and wire 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 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 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
ISO 6892-3, Metallic materials — Tensile testing — Part 3: Method of test at low 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 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 15630-1:2019(E)
For the purposes of this document, the following symbols apply.
Symbol Unit Description Reference
a′ mm Height of longitudinal rib 10.3.2, 11.3
a mm Rib height at the mid-point or indentation depth in the centre 10.3.1.2, Figure 6,
m
11.3.2, 11.4.1, 11.4.2
a
a mm Maximum height of transverse rib or maximum indentation depth 10.3.1.1
max
a mm Average height of a portion i of a rib subdivided into p parts of Figure 6, 11.3.1, 11.4.1
s,i
length Δl, or average depth of a portion i of an indentation subdivid-
ed into p parts of length Δx
a mm Rib height at the quarter-point or indentation depth at the quarter 10.3.1.2, 11.3.2, 11.4.2
1/4
of their length
a mm Rib height at the three-quarters point or indentation depth at the 10.3.1.2, 11.3.2, 11.4.2
3/4
three-quarters of their length
A % Percentage elongation after fracture 5.1, 5.3
A % Percentage plastic extension at maximum force (F ) 5.3
g m
A % Percentage total extension at maximum force (F ) Clause 5
gt m
A % Percentage uniform elongation after fracture 5.3
r
b mm Width of transverse rib at the mid-point or width of indentation 10.3.8
c mm Transverse rib or indentation spacing Figure 6, 10.3.3, 11.3
d mm Nominal diameter of the bar, rod or wire 5.3, Figure 3, 8.2,
8.4.7, 11.3, 11.4,
Table 1, 13.3.4.8
D mm Diameter of the mandrel of the bending device in the bend or reb- Figure 2, 6.3, 7.3.2
end test
e mm Average gap between two adjacent rib or indentation rows 10.3.5, Figure 6,
11.3.2, Figure 7
f Hz Frequency of force cycles in the axial force fatigue test 8.1, 8.4.3, Table 1
f — Relative indentation area Clause 11
P
f — Relative rib area Clause 11
R
F N Maximum force in the tensile test 5.3
m
F mm Area of the longitudinal section of one indentation 11.4.1
P
F N Force range in the axial force fatigue test 8.1, 8.3, 8.4.2, 8.4.3
r
F mm Area of the longitudinal section of one rib Figure 6, 11.3.1
R
F N Upper force in the axial force fatigue test 8.1, 8.3, 8.4.2, 8.4.3
up
l mm Length of the transverse rib at the rib-core interface Figure 6
n, m, q, p — Quantities used in formulae defining f , f , F and F 11.3, 11.4
R P R P
P mm Pitch for cold-twisted bars 10.3.4, 11.3
r mm Distance between the grips and the gauge length for the manual 5.3
measurement of A
gt
r mm Distance between the fracture and the gauge length for the manual 5.3
measurement of A
gt
R MPa Upper yield strength 5.3
eH
R MPa Tensile strength 5.3
m
R MPa 0,2 % proof strength, plastic extension 5.2, 5.3
p0,2
S mm Nominal cross-sectional area of the bar, rod or wire 8.4.2
n
x mm Length of an indentation Figure 7
NOTE  1 MPa = 1 N/mm .
a
In some product standards, the symbol h is also used for this parameter.
2 © ISO 2019 – All rights reserved

ISO 15630-1:2019(E)
Symbol Unit Description Reference
α ° Transverse rib flank inclination 10.3.7
β ° Angle between the axis of a transverse rib or indentation and the 10.3.1, 10.3.6, Fig-
bar, rod or wire axis ure 6, 11.3, 11.4
γ ° Angle of bend in the bend or rebend test 6.3, Figure 4, 7.3.2
Δl mm Incremental part of the length of the transverse rib at the rib-core 11.3.1, Figure 6
interface
Δx mm Incremental part of the length of an indentation 11.4.1
δ ° Angle of rebend in the rebend test Figure 4, 7.3.4
λ — Empirical factor in empirical formulae of f and f 11.3.2, 11.4.2
R P
φ — Empirical factor in formula of f for ribs of constant height 11.3.2
R
2σ MPa Stress range in the axial force fatigue test 8.4.2
a
σ MPa Maximum stress in the axial force fatigue test 8.4.2
max
∑e mm Part of the circumference without indentation or rib 10.3.5, 11.3.2, 11.4.2
i
NOTE  1 MPa = 1 N/mm .
a
In some product standards, the symbol h is also used for this parameter.
4 General provisions concerning test pieces
Unless otherwise agreed or specified in the product standard, the test piece shall be taken from the bar,
rod or wire in the as-delivered condition.
In the case of a test piece taken from a coil (rod or wire), the test piece shall be straightened prior to any
testing by a bend operation with a minimum amount of plastic deformation.
NOTE 1 The straightness of the test piece is critical for the tensile test at room temperature, the tensile test at
low temperature, the axial force fatigue test and the cyclic inelastic load test.
The means of straightening the test piece (manual, machine) shall be indicated in the test report.
For routine tests conducted by the manufacturers of reinforcing steels, the test information,
including the test piece condition and method of straightening, should be described within internal
documentation.
For the determination of the mechanical properties in the tensile test at room temperature, the tensile
test at low temperature, the axial force fatigue test and the cyclic inelastic load test, the test piece may
be artificially aged (after straightening if applicable), depending on the requirements of the product
standard.
If ageing is specified but the product standard does not specify the ageing treatment, the following
conditions should be applied: heating the test piece to 100 °C, maintaining at this temperature ±10 °C
for a period between 60 min and 75 min and then cooling in still air to ambient temperature.
NOTE 2 Depending on the conditions (number of test pieces, diameter of test pieces, type of heating device),
different heating times can be required for the test piece to reach the temperature of 100 °C. Unless otherwise
proven, a minimum heating time of 40 min can be assumed for the test pieces to reach the oven/bath operating
temperature.
If an ageing treatment is applied to the test piece, the conditions of the ageing treatment shall be stated
in the test report.
ISO 15630-1:2019(E)
5 Tensile test at room temperature
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 elongation after fracture or the percentage total extension at
maximum force in accordance with 5.3.
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,
gt
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 testing machine 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
R ; for the determination of A , a class 2 extensometer (see ISO 9513) may be used.
p0,2 gt
Any extensometer used for the determination of the percentage total extension at maximum force (A )
gt
shall have a gauge length of at least 100 mm. The gauge length shall be indicated in the test report.
5.3 Test procedure
The tensile test shall be performed in accordance with ISO 6892-1. For the determination of R , if the
p0,2
straight portion of the force-extension diagram is limited or not clearly defined, one of the following
methods shall be applied:
— the procedure recommended in ISO 6892-1;
— the straight portion of the force-extension diagram shall be considered as the line joining the points
corresponding to 0,2F and 0,5F .
m m
F may be predefined as the force corresponding to the nominal tensile strength given in the
m
applicable product standard.
For stainless steels, other values than the ones mentioned above, applicable to carbon steels, may
be replaced by the appropriate values given in the product standard or agreed between the parties
involved.
In case of dispute, the second procedure shall be applied.
The test may be considered invalid if the slope of this line differs by more than 10 % from the theoretical
value of the modulus of elasticity.
For the calculation of tensile properties (R or R , R ), the nominal cross-sectional area shall be
eH p0,2 m
used, unless otherwise specified in the relevant product standard.
Where fracture occurs in the grips or at a distance from the grips less than 20 mm or d (whichever is
the greater), the test may be considered as invalid.
For the determination of percentage elongation after fracture (A), the original gauge length shall be five
times the nominal diameter (d), unless otherwise specified in the relevant product standard. In case of
dispute, A shall be determined manually.
The percentage total extension at maximum force (A ) shall be determined either by using an
gt
extensometer or by the manual method described in this document.
4 © ISO 2019 – All rights reserved

ISO 15630-1:2019(E)
If A is measured by using an extensometer, ISO 6892-1 shall be applied with the following modification.
gt
A shall be recorded before the force has dropped more than 0,2 % from its maximum value.
gt
NOTE This provision is aimed at avoiding different values with different methods (manual vs. extensometer).
It is recognized that the use of extensometers tends to give on average a lower value of A than the one measured
gt
manually.
If A is determined by the manual method after fracture, A shall be calculated from Formula (1):
gt gt
AA=+R /2000 (1)
gt rm
where A is the percentage uniform elongation after fracture.
r
For stainless steels, the value 2 000 in Formula (1) should be replaced by the appropriate value given in
the product standard or agreed between the parties involved.
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.
In case of dispute, the manual method shall apply.

a
Grip length.
b
Gauge length 100 mm.
Figure 1 — Measurement of A by the manual method
gt
6 Bend test
6.1 Test piece
The general provisions given in Clause 4 apply.
ISO 15630-1:2019(E)
6.2 Test equipment
6.2.1 A bending device, the principle of which is shown in Figure 2, shall be used.
Key
1 mandrel
2 support
3 carrier
Figure 2 — Principle of a bending device
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.
6.2.2 The bend test may also be performed by 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, unless otherwise agreed
by the parties involved.
For testing at a low temperature, if the agreement between the parties involved does not specify all
the testing conditions, a deviation of ±2 °C on the agreed temperature should be applied. The test piece
should be immersed in the cooling medium for a sufficient time to ensure that the required temperature
is reached throughout the test piece (for example, at least 10 min in a liquid medium or at least 30 min in
a gaseous medium). The bend test should start within 5 s from removal from the medium. The transfer
device should be designed and used in such a way that the temperature of the test piece is maintained
within the temperature range.
The test piece shall be bent over a mandrel.
In the case of hot-rolled threaded bars, the mandrel shall be placed on the longitudinal flat part of the
bar unless otherwise stated in the product standard or agreed between the parties involved.
The angle of bend (γ) and the diameter of the mandrel (D) shall be in accordance with the relevant
product standard.
6.4 Interpretation of test results
The interpretation of the bend test shall be performed in accordance with the requirements of the
relevant product standard.
6 © ISO 2019 – All rights reserved

ISO 15630-1:2019(E)
If requirements are not specified in the relevant product standard, the absence of cracks visible to a
person with normal or corrected vision shall be considered as evidence that the test piece withstood
the bend test.
A superficial ductile tear may occur at the base of the ribs or indentations and is not considered to be a
failure. The tear may be considered superficial when the depth of the tear is not greater than the width
of the tear.
7 Rebend test
7.1 Test piece
The general provisions given in Clause 4 apply.
7.2 Test equipment
7.2.1 Bending device
A bending device as specified in 6.2 shall be used.
7.2.2 Rebending device
Rebending can be performed on a bending device as shown in Figure 2. An example of an alternative
rebending device is shown in Figure 3.
Figure 3 — Example of a rebending device
7.3 Test procedure
7.3.1 General
The test procedure consists of three steps:
a) bending;
b) artificial ageing;
c) rebending.
The test procedure is illustrated in Figure 4.
ISO 15630-1:2019(E)
Key
1 mandrel
2 test piece
a
Initial position
b
Position after operation described in 7.3.2
c
Position after operation described in 7.3.4
Figure 4 — Illustration of the test procedure for rebend tests
7.3.2 Bending
Bending shall be performed at a temperature between 10 °C and 35 °C. The test piece shall be bent over
a mandrel. In the case of hot-rolled threaded bars, the mandrel shall be placed on the longitudinal flat
part of the bar unless otherwise stated in the product standard or agreed between the parties involved.
The angle of bend (γ) and diameter of mandrel (D) shall be in accordance with the relevant product
standard.
The test piece shall be carefully inspected for cracks and fissures visible to a person with normal or
corrected vision.
7.3.3 Artificial ageing
The temperature and time of artificial ageing shall be in accordance with the relevant product standard.
If the product standard does not specify any ageing treatment, the conditions specified in Clause 4
should be applied.
7.3.4 Rebending
After free cooling in still air to a temperature between 10 °C and 35 °C, the test piece shall be bent back
by a specified angle (δ) in accordance with the relevant product standard.
7.4 Interpretation of test results
The interpretation of the rebend test results shall be performed in accordance with the requirements of
the relevant product standard.
If these requirements are not specified, the absence of cracks visible to a person with a normal or
corrected vision shall be considered as evidence that the test piece has withstood the rebend test.
8 © ISO 2019 – All rights reserved

ISO 15630-1:2019(E)
A superficial ductile tear may occur at the base of the ribs or indentations and shall not be considered
to be a failure. The tear may be considered superficial when the depth of the tear is not greater than the
width of the tear.
8 Axial force fatigue test
8.1 Principle of test
The axial force fatigue test consists of submitting the test piece to an axial tensile force, which varies
cyclically according to a sinusoidal wave-form of constant frequency ( f) in the elastic range (see
Figure 5). The test is performed until failure of the test piece or until reaching, without failure, the
number of force cy
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