ISO 6935-2:2019
(Main)Steel for the reinforcement of concrete — Part 2: Ribbed bars
Steel for the reinforcement of concrete — Part 2: Ribbed bars
This document specifies technical requirements for ribbed bars to be used as reinforcement in concrete. It is applicable to steel delivered in the form of bars, coils and de-coiled products. This document covers both weldable and non-weldable steels. It does not apply to ribbed bars produced from finished products, such as plates and railway rails. The production process is at the discretion of the manufacturer.
Aciers pour l'armature du béton — Partie 2: Barres à verrous
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INTERNATIONAL ISO
STANDARD 6935-2
Fourth edition
2019-10
Steel for the reinforcement of
concrete —
Part 2:
Ribbed bars
Aciers pour l'armature du béton —
Partie 2: Barres à verrous
Reference number
©
ISO 2019
© 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
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Dimensions, mass per unit length and permissible deviations. 4
6 Requirements for ribs . 5
7 Chemical composition . 8
8 Mechanical properties .10
8.1 Tensile properties .10
8.2 Bending properties .12
8.3 Rebending properties after ageing .12
8.4 Fatigue properties .12
9 Testing .13
9.1 Tensile test .13
9.2 Conditions of testing .13
9.3 Bend test .13
9.4 Rebend test .13
9.5 Fatigue test .14
9.6 Chemical composition .14
10 Designation .14
11 Marking .14
11.1 Marking on bars .14
11.2 Identification of bundles.15
12 Evaluation of conformity .15
12.1 General .15
12.2 Evaluation of conformity during production .15
12.3 Acceptance testing of a specific delivery .16
12.3.1 General.16
12.3.2 Evaluation of characteristic values .16
12.3.3 Evaluation of specified minimum/maximum values .18
12.3.4 Test report .18
Annex A (informative) Five examples of marking systems for ribbed bars .19
Annex B (informative) Options for agreement between the manufacturer and purchaser .24
Bibliography .25
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 Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for
the reinforcement and prestressing of concrete.
This fourth edition cancels and replaces the third edition (ISO 6935-2:2015), which has been technically
revised. The main changes compared to the previous edition are as follows:
— Figures 1, 2, 3 have been revised;
— Figure 5, A.3, A.4 have been newly added;
— introduction of hot-rolled threaded reinforcing bar in Clause 3, 4, 6 and A.7.
A list of all parts in the ISO 6935 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.
iv © ISO 2019 – All rights reserved
INTERNATIONAL STANDARD ISO 6935-2:2019(E)
Steel for the reinforcement of concrete —
Part 2:
Ribbed bars
1 Scope
This document specifies technical requirements for ribbed bars to be used as reinforcement in concrete.
It is applicable to steel delivered in the form of bars, coils and de-coiled products. This document
covers both weldable and non-weldable steels. It does not apply to ribbed bars produced from finished
products, such as plates and railway rails.
The production process is at the discretion of the manufacturer.
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/TR 9769, Steel and iron — Review of available methods of analysis
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing
bars, rods and wire
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
cast analysis
chemical analysis representative of the cast determined by the manufacturer in accordance with its
own procedures
[SOURCE: ISO 16020:2005, 2.4.3, modified — “manufacturer” has replaced “steelmaker”.]
3.2
conformity assessment scheme
conformity assessment system related to specific objects of conformity assessment, to which the same
specified requirements, specific rules and procedures apply
Note 1 to entry: Conformity assessment schemes may be operated at an international, national or sub-national level.
Note 2 to entry: Certification, i.e. third-party attestation related to products, processes, systems or persons, is
applicable to all objects of conformity assessment except for conformity assessment bodies themselves, to which
accreditation is applicable.
3.3
characteristic value
value having a prescribed probability of not being attained in a hypothetical unlimited test series
Note 1 to entry: Equivalent to “fractile”, which is defined in ISO 3534-1:2006.
Note 2 to entry: A nominal value is used as the characteristic value in some circumstances.
[SOURCE: ISO 16020:2005, 2.4.10, modified —Note 2 to entry has been added.]
3.4
core
part of the cross section of a bar containing neither ribs nor indentations
[SOURCE: ISO 16020:2005, 2.2.5, modified — “wire” has been removed from the definition.]
3.5
ductility class
classification of the ductility properties of ribbed reinforcing bars based on the value of the ratio of
tensile strength to yield strength, as well as the elongation measured either as A or as A
gt
Note 1 to entry: See Table 6.
3.6
hot-rolled threaded reinforcing bar
type of bar with threaded geometry over its entire surface with two flat parts on the longitudinal side
Note 1 to entry: This type of bar with external threads is generally connected to other threaded bars with
internally threaded couplers.
3.7
longitudinal rib
uniform continuous rib parallel to the axis of a bar
[SOURCE: ISO 16020:2005, 2.2.7.1, modified — “wire” has been removed from the definition.]
3.8
nominal cross-sectional area
S
cross-sectional area equivalent to the area of a circular plain bar of the same nominal diameter
[SOURCE: ISO 16020:2005, 2.2.15, modified — “wire” has been removed from the definition.]
3.9
product analysis
chemical analysis carried out on the product
[SOURCE: ISO 16020:2005, 2.4.4]
3.10
relative rib area
f
R
area of the projections of all transverse ribs within a defined length on a plane perpendicular to the
longitudinal axis of the bar, divided by this length and the nominal circumferen
...
INTERNATIONAL ISO
STANDARD 6935-2
Fourth edition
2019-10
Steel for the reinforcement of
concrete —
Part 2:
Ribbed bars
Aciers pour l'armature du béton —
Partie 2: Barres à verrous
Reference number
©
ISO 2019
© 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
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Dimensions, mass per unit length and permissible deviations. 4
6 Requirements for ribs . 5
7 Chemical composition . 8
8 Mechanical properties .10
8.1 Tensile properties .10
8.2 Bending properties .12
8.3 Rebending properties after ageing .12
8.4 Fatigue properties .12
9 Testing .13
9.1 Tensile test .13
9.2 Conditions of testing .13
9.3 Bend test .13
9.4 Rebend test .13
9.5 Fatigue test .14
9.6 Chemical composition .14
10 Designation .14
11 Marking .14
11.1 Marking on bars .14
11.2 Identification of bundles.15
12 Evaluation of conformity .15
12.1 General .15
12.2 Evaluation of conformity during production .15
12.3 Acceptance testing of a specific delivery .16
12.3.1 General.16
12.3.2 Evaluation of characteristic values .16
12.3.3 Evaluation of specified minimum/maximum values .18
12.3.4 Test report .18
Annex A (informative) Five examples of marking systems for ribbed bars .19
Annex B (informative) Options for agreement between the manufacturer and purchaser .24
Bibliography .25
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 Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for
the reinforcement and prestressing of concrete.
This fourth edition cancels and replaces the third edition (ISO 6935-2:2015), which has been technically
revised. The main changes compared to the previous edition are as follows:
— Figures 1, 2, 3 have been revised;
— Figure 5, A.3, A.4 have been newly added;
— introduction of hot-rolled threaded reinforcing bar in Clause 3, 4, 6 and A.7.
A list of all parts in the ISO 6935 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.
iv © ISO 2019 – All rights reserved
INTERNATIONAL STANDARD ISO 6935-2:2019(E)
Steel for the reinforcement of concrete —
Part 2:
Ribbed bars
1 Scope
This document specifies technical requirements for ribbed bars to be used as reinforcement in concrete.
It is applicable to steel delivered in the form of bars, coils and de-coiled products. This document
covers both weldable and non-weldable steels. It does not apply to ribbed bars produced from finished
products, such as plates and railway rails.
The production process is at the discretion of the manufacturer.
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/TR 9769, Steel and iron — Review of available methods of analysis
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing
bars, rods and wire
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
cast analysis
chemical analysis representative of the cast determined by the manufacturer in accordance with its
own procedures
[SOURCE: ISO 16020:2005, 2.4.3, modified — “manufacturer” has replaced “steelmaker”.]
3.2
conformity assessment scheme
conformity assessment system related to specific objects of conformity assessment, to which the same
specified requirements, specific rules and procedures apply
Note 1 to entry: Conformity assessment schemes may be operated at an international, national or sub-national level.
Note 2 to entry: Certification, i.e. third-party attestation related to products, processes, systems or persons, is
applicable to all objects of conformity assessment except for conformity assessment bodies themselves, to which
accreditation is applicable.
3.3
characteristic value
value having a prescribed probability of not being attained in a hypothetical unlimited test series
Note 1 to entry: Equivalent to “fractile”, which is defined in ISO 3534-1:2006.
Note 2 to entry: A nominal value is used as the characteristic value in some circumstances.
[SOURCE: ISO 16020:2005, 2.4.10, modified —Note 2 to entry has been added.]
3.4
core
part of the cross section of a bar containing neither ribs nor indentations
[SOURCE: ISO 16020:2005, 2.2.5, modified — “wire” has been removed from the definition.]
3.5
ductility class
classification of the ductility properties of ribbed reinforcing bars based on the value of the ratio of
tensile strength to yield strength, as well as the elongation measured either as A or as A
gt
Note 1 to entry: See Table 6.
3.6
hot-rolled threaded reinforcing bar
type of bar with threaded geometry over its entire surface with two flat parts on the longitudinal side
Note 1 to entry: This type of bar with external threads is generally connected to other threaded bars with
internally threaded couplers.
3.7
longitudinal rib
uniform continuous rib parallel to the axis of a bar
[SOURCE: ISO 16020:2005, 2.2.7.1, modified — “wire” has been removed from the definition.]
3.8
nominal cross-sectional area
S
cross-sectional area equivalent to the area of a circular plain bar of the same nominal diameter
[SOURCE: ISO 16020:2005, 2.2.15, modified — “wire” has been removed from the definition.]
3.9
product analysis
chemical analysis carried out on the product
[SOURCE: ISO 16020:2005, 2.4.4]
3.10
relative rib area
f
R
area of the projections of all transverse ribs within a defined length on a plane perpendicular to the
longitudinal axis of the bar, divided by this length and the nominal circumferen
...
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