ISO 6934-2:2024
(Main)Steel for the prestressing of concrete — Part 2: Cold-drawn wire
Steel for the prestressing of concrete — Part 2: Cold-drawn wire
This document specifies requirements for round, cold-drawn, high-tensile steel wire, that is either plain, indented, spiral ribbed or crimped. The product is supplied as mill coil wire or straightened and stress-relieved wire in coils or cut lengths, according to the general requirements specified in ISO 6934-1.
Acier pour armatures de précontrainte — Partie 2: Fil tréfilé à froid
General Information
Relations
Standards Content (Sample)
International
Standard
ISO 6934-2
Second edition
Steel for the prestressing of
2024-12
concrete —
Part 2:
Cold-drawn wire
Acier pour armatures de précontrainte —
Partie 2: Fil tréfilé à froid
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test methods . 1
5 Conditions of manufacture . 1
6 Surface configuration . 1
7 Properties . 2
7.1 General .2
7.2 Dimensions and properties of mill coil wire .2
7.2.1 Dimensions, masses and tensile properties .2
7.2.2 Elongation and ductility .2
7.2.3 Relaxation .3
7.2.4 Fatigue .3
7.2.5 Torsion .3
7.2.6 Stress corrosion test .3
7.3 Dimensions and properties of stress-relieved wire .4
7.3.1 Dimensions, masses and tensile properties .4
7.3.2 Elongation and ductility .4
7.3.3 Relaxation .5
7.3.4 Fatigue .5
7.3.5 Stress corrosion test .6
8 Designation . 6
9 Delivery conditions . 6
9.1 General .6
9.2 Coil size .6
9.3 Curvature of stress-relieved wires.7
Annex A (informative) Examples of indentations, crimps and spiral ribs . 8
Annex B (informative) Recommended internal diameter of coil .11
iii
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
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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 document 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).
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patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
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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 6934-2:1991), which has been technically
revised.
The main changes are as follows:
— ISO 7800 and ISO 15630-3 are referenced as inspection method standards;
— the following are added for mill coil wire in Table 1:
— requirements of maximum value of maximum tensile load and minimum constriction;
— notes for characteristic 0,1 % proof forces;
— notes for confidence interval of characteristic value;
— requirements and criteria of torsion test and stress corrosion for mill coil wire;
— fatigue test method for mill coil wire;
— the following diameter are added for stress-relieved wire in Table 2:
— 1 570 MPa: 6,25 mm, 7,5 mm, 9,5 mm, 10,5 mm;
— 1 670 MPa: 7,5 mm;
— 1 770 MPa: 7 mm;
— 1 860 MPa: 4 mm, 5 mm, 6 mm, 7 mm;
— requirements and criteria of stress corrosion test, fatigue test method and maximum value of maximum
tensile load are added for stress-relieved wire;
iv
— notes of “arrow-head” rupture and confidence interval of characteristic value are added in Table 2;
— Figure A.3 has been added in Annex A;
— Figure A.1 and Figure A.2 have been updated.
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.
v
International Standard ISO 6934-2:2024(en)
Steel for the prestressing of concrete —
Part 2:
Cold-drawn wire
1 Scope
This document specifies requirements for round, cold-drawn, high-tensile steel wire, that is either plain,
indented, spiral ribbed or crimped. The product is supplied as mill coil wire or straightened and stress-
relieved wire in coils or cut lengths, according to the general requirements specified in ISO 6934-1.
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 6934-1, Steel for the prestressing of concrete — Part 1: General requirements
ISO 7800, Metallic materials — Wire — Simple torsion test
ISO 15630-3:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 3:
Prestressing steel
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6934-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Test methods
The test methods for all properties except "Torsion" shall be in accordance with ISO 15630-3.
5 Conditions of manufacture
The wire shall be manufactured from high carbon steel in accordance with ISO 6934-1.
The wire shall be supplied without welds or other joints.
6 Surface configuration
There are several types of surface configuration (spiral ribs, indentations, crimps), the purpose of which is
to improve bond properties between wire and concrete. The type of surface configuration shall be agreed
between purchaser and manufacturer.
Examples of indentations, crimps and spiral ribs are given in Annex A.
7 Properties
7.1 General
The designations, data for information and required properties are given in Table 1 and Table 2.
7.2 Dimensions and properties of mill coil wire
7.2.1 Dimensions, masses and tensile properties
See Table 1.
7.2.2 Elongation and ductility
The percentage total elongation at maximum force, measured on a length of 200 mm, shall be not less than 1,5 %.
All wires shall show a ductile fracture with a constriction visible to the naked eye.
All wires shall withstand a reverse bend test around the bend radius given in Table 1. The number of bends
shall not be lower than four for plain wires, not be lower than three for indented and spiral ribbed wires.
Table 1 — Dimensions, masses and tensile properties of mill coil wire
b
Nominal Nom- Nominal Mass per length Characteristic Bend Mini. re-
diame- inal cross-sec- radius duction
Nomi- Permissi- Maxi- Maxi- 0,1 % Mini.
ter tensile tional area of area
c
nal ble devia- mum mum Proof num-
streng-
e
tion force value of force ber of
a
th
maxi- twists
mum in the
d
force torsion
test
2 2
mm N/mm mm g/m g/m kN kN kN N mm %
8 1 470 50,3 395 ±5,9 73,9 84,0 59,1 11 20 30
8 1 570 50,3 395 ±5,9 79 89,0 63,2 11 20 30
7 1 570 38,5 302 ±4,3 60,4 68,1 48,3 12 20 30
7 1 670 38,5 302 ±4,3 64,3 72,0 51,4 12 20 30
6 1 670 28,3 222 ±3,7 47,3 52,9 37,8 12 15 30
6 1 770 28,3 222 ±3,7 50,1 55,8 40,1 12 15 30
5 1 670 19,6 154 ±3,1 32,7 36,7 26,2 12 15 35
5 1 770 19,6 154 ±3,1 34,7 38,6 27,8 12 15 35
4 1 670 12,6 98,9 ±2,0 21 23,6 16,8 24 10 35
4 1 770 12,6 98,9 ±2,0 22,3 24,8 17,8 24 10 35
3 1 770 7,07 55,5 ±1,5 12,5 13,9 10 — 7,5 35
a
The nominal tensile strength is for designation purposes only and is calculated from the nominal cross-sectional area and
the characteristic maximum force and rounded off to the nearest 10 N/mm .
b
In view of the small to
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