Steel for the prestressing of concrete — Part 4: Strand

This document specifies requirements for steel strand which has been given a stress-relieving heat treatment according to the general requirements specified in ISO 6934-1. This document covers 10 grades of steel strand for use in prestressed concrete construction; each strand can contain either 2, 3, 7 or 19 individual wires. In case of any conflict between the requirements of this document and ISO 6934-1, the requirements of document prevail.

Acier pour armatures de précontrainte — Partie 4: Torons

General Information

Status
Published
Publication Date
29-Nov-2020
Current Stage
6060 - International Standard published
Start Date
30-Nov-2020
Completion Date
30-Nov-2020
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INTERNATIONAL ISO
STANDARD 6934-4
Second edition
2020-11
Steel for the prestressing of
concrete —
Part 4:
Strand
Acier pour armatures de précontrainte —
Partie 4: Torons
Reference number
ISO 6934-4:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 6934-4:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6934-4:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative reference ......................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Conditions of manufacture ........................................................................................................................................................................ 1

4.1 Steel .................................................................................................................................................................................................................. 1

4.2 Stress-relieving heat treatment ................................................................................................................................................ 1

4.3 Compacted strand ................................................................................................................................................................................ 2

4.4 Welds ............................................................................................................................................................................................................... 2

4.4.1 2-wire and 3-wire strand .................. ........................................................................................................................ 2

4.4.2 7-wire and 19-wire strand ...................................................................................................................................... 2

4.5 Cracks .............................................................................................................................................................................................................. 2

4.6 Finishing and appearance ............................................................................................................................................................. 2

5 Strand configuration ........................................................................................................................................................................................ 2

6 Properties .................................................................................................................................................................................................................... 3

6.1 Dimensions, masses and strength of strand .................................................................................................................. 3

6.2 Elongation and ductility .................................................................................................................................................................. 3

6.3 Relaxation .................................................................................................................................................................................................... 3

6.4 Fatigue ............................................................................................................................................................................................................ 3

6.5 Stress corrosion...................................................................................................................................................................................... 3

6.6 Deflected tensile test .......................................................................................................................................................................... 3

7 Designation ................................................................................................................................................................................................................ 5

8 Delivery conditions ............................................................................................................................................................................................ 5

8.1 General ........................................................................................................................................................................................................... 5

8.2 Reel dimension ....................................................................................................................................................................................... 5

8.3 Curvature of strand ............................................................................................................................................................................. 6

Annex A (informative) Considerations on stress corrosion ......................................................................................................... 7

Annex B (informative) Deflected tensile strength .................................................................................................................................. 8

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6934-4:2020(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 Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for

the reinforcement and prestressing of concrete.

This second edition cancels and replaces the first edition (ISO 6934-4:1991), which has been

technically revised. It also incorporates the Technical Corrigenda ISO 6934-4:1991/Cor 1:1992 and

ISO 6934-4:1991/Cor 1:2000.
The main changes compared to the previous edition are as follows:
— subclause 4.6 has been added to introduce finishing and appearance;
— Figure 1 has been updated;

— subclause 6.5 and Annex A have been added to introduce and elaborate on stress corrosion;

— subclause 6.6 and Annex B have been added to introduce and elaborate on deflected tensile test;

— Table 1 has been updated;

— in Clause 7, the terminology "newtons per square millimetre" has been replaced with "MPa";

— in Clause 8, packing and protection requirements has been added.
A list of all parts in the ISO 6934 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 2020 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6934-4:2020(E)
Steel for the prestressing of concrete —
Part 4:
Strand
1 Scope

This document specifies requirements for steel strand which has been given a stress-relieving heat

treatment according to the general requirements specified in ISO 6934-1. This document covers 10

grades of steel strand for use in prestressed concrete construction; each strand can contain either

2, 3, 7 or 19 individual wires. In case of any conflict between the requirements of this document and

ISO 6934-1, the requirements of document prevail.
2 Normative reference

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 6934-1, Steel for the prestressing of concrete — Part 1: General requirements

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 6934-1 and the following apply.

ISO and IEC maintain terminological databases for
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6934-4
ISO/TC 17/SC 16
Steel for the prestressing of
Secretariat: SN
concrete —
Voting begins on:
2020-08-28
Part 4:
Voting terminates on:
Strand
2020-10-23
Acier pour armatures de précontrainte —
Partie 4: Torons
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6934-4:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 6934-4:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 6934-4:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative reference ......................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Conditions of manufacture ........................................................................................................................................................................ 1

4.1 Steel .................................................................................................................................................................................................................. 1

4.2 Stress-relieving heat treatment ................................................................................................................................................ 1

4.3 Compacted strand ................................................................................................................................................................................ 2

4.4 Welds ............................................................................................................................................................................................................... 2

4.4.1 2-wire and 3-wire strand .................. ........................................................................................................................ 2

4.4.2 7-wire and 19-wire strand ...................................................................................................................................... 2

4.5 Cracks .............................................................................................................................................................................................................. 2

4.6 Finishing and appearance ............................................................................................................................................................. 2

5 Strand configuration ........................................................................................................................................................................................ 2

6 Properties .................................................................................................................................................................................................................... 3

6.1 Dimensions, masses and strength of strand .................................................................................................................. 3

6.2 Elongation and ductility .................................................................................................................................................................. 3

6.3 Relaxation .................................................................................................................................................................................................... 3

6.4 Fatigue ............................................................................................................................................................................................................ 3

6.5 Stress corrosion...................................................................................................................................................................................... 3

6.6 Deflected tensile test .......................................................................................................................................................................... 3

7 Designation ................................................................................................................................................................................................................ 5

8 Delivery conditions ............................................................................................................................................................................................ 5

8.1 General ........................................................................................................................................................................................................... 5

8.2 Reel dimension ....................................................................................................................................................................................... 5

8.3 Curvature of strand ............................................................................................................................................................................. 6

Annex A (informative) Considerations on stress corrosion ......................................................................................................... 7

Annex B (informative) Deflected tensile strength .................................................................................................................................. 8

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 6934-4:2020(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 Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for

the reinforcement and prestressing of concrete.

This second edition cancels and replaces the first edition (ISO 6934-4:1991), which has been

technically revised. It also incorporates the Technical Corrigenda ISO 6934-4:1991/Cor 1:1992 and

ISO 6934-4:1991/Cor 1:2000.
The main changes compared to the previous edition are as follows:
— subclause 4.6 has been added to introduce finishing and appearance;
— Figure 1 has been updated;

— subclause 6.5 and Annex A have been added to introduce and elaborate on stress corrosion;

— subclause 6.6 and Annex B have been added to introduce and elaborate on deflected tensile test;

— Table 1 has been updated;

— in Clause 7, the terminology "newtons per square millimetre" has been replaced with "MPa";

— in Clause 8, packing and protection requirements has been added.
A list of all parts in the ISO 6934 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 2020 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 6934-4:2020(E)
Steel for the prestressing of concrete —
Part 4:
Strand
1 Scope

This document specifies requirements for steel strand which has been given a stress-relieving heat

treatment according to the general requirements specified in ISO 6934-1. This document covers 10

grades of steel strand for use in prestressed concrete construction; each strand can contain either

2, 3, 7 or 19 individual wires. In case of any conflict between the requirements of this document and

ISO 6934-1, the requirements of document prevail.
2 Normative reference

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 amen

...

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