ISO 10544:2024

International
Standard
ISO 10544
Second edition
Cold-reduced steel wire for the
2024-01
reinforcement of concrete and the
manufacture of welded fabric
Fils en acier à béton transformés à froid pour armatures passives
et la fabrication des treillis soudés
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions, masses and tolerances . . 3
5 Geometry of ribbed and indented wires . 4
5.1 Ribbed wire .4
5.2 Indented wire .6
6 Chemical composition . 8
7 Mechanical properties . 9
7.1 Tensile properties .9
7.2 Bending properties .9
7.3 Rebending properties .9
8 Testing of mechanical properties . 9
8.1 Tensile test .9
8.2 Bend test .10
8.3 Rebend test .10
9 Designation .10
10 Marking . .10
10.1 Marking on the wire .10
10.2 Marking of bundles or coils .11
11 Testing and inspection .11
11.1 General .11
11.2 Evaluation of conformity during production .11
11.3 Testing of a specific delivery .11
11.4 Verification of conformity .11
11.4.1 Organization . . .11
11.4.2 Extent of sampling and testing .11
11.4.3 Evaluation of the results . 12
11.5 Verification of guaranteed minimum values . 13
12 Test report .13
Annex A (informative) Identification of origin on the wire . 14
Bibliography .16

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)
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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 10544:1992), which has been technically
revised.
The main changes are as follows:
— normative references have been revised;
— terms and definitions have been revised;
— diameters have been extended to 18 mm;
— geometry of ribbed and indented wires have been revised;
— steel grade and chemical composition have been revised;
— example of identification of manufacturer on ribbed wire and indented wire have been added.
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
International Standard ISO 10544:2024(en)
Cold-reduced steel wire for the reinforcement of concrete and
the manufacture of welded fabric
1 Scope
This document specifies technical requirements for cold-reduced steel wire designed for the reinforcement
of concrete or for use in welded fabric.
Two steel grades, CRB500 and CRB540H are defined as examples. Other grades can be used.
This document is applicable to wire made from rod by working through dies or rollers. The production
process is at the discretion of the manufacturer.
For wire supplied in coil form, this document is applicable to the straightened product.
Wires produced from finished products, such as plates and railway rails, are outside the scope of this
document.
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 404, Steel and steel products — General technical delivery requirements
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
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 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/
3.1
cast analysis
chemical analysis of a sample of the molten steel during casting
3.2
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.
[SOURCE: ISO 16020:2005, 2.4.10]

3.3
core
part of cross-section of the wire that contains neither ribs nor indentations
3.4
indentation inclination
β
ind
angle between the indentation and the longitudinal axis of the wire
Note 1 to entry: See Figure 3 and Figure 4.
3.5
indentation spacing
c
ind
distance between the centres of two consecutive indentations measured parallel to the axis of the wire
Note 1 to entry: See Figures 3 and 4.
3.6
indented wire
wire whose surface has indentations at regular intervals along the length
3.7
inspection
activities such as measuring, examining, testing, gauging one or more characteristics of a product or service
and comparing these with specified requirements to determine conformity
3.8
nominal cross-sectional area
cross-sectional area equivalent to the area of a circular plain wire of the nominal diameter
3.9
plain wire
smooth surfaced wire without bond enhancing properties
3.10
product analysis
chemical analysis of a sample from a wire
3.11
rib height
ɑ
distance from the highest point of the rib to the surface of the core, measured normal to the axis of the wire
Note 1 to entry: See Figures 1 and 2.
3.12
rib inclination
β
rib
angle between the rib and the longitudinal axis of the wire
Note 1 to entry: See Figures 1 and 2.
3.13
rib spacing
c
rib
distance between the centres of two consecutive transverse ribs measured parallel to the axis of the wire
Note 1 to entry: See Figures 1 and 2.

3.14
ribbed wire
wire whose surface has ribs at regular intervals along the length
3.15
test unit
number of pieces or the tonnage of products to be accepted or rejected together, on the basis of the tests
carried out on sample products in accordance with the requirements of the product standard or order
3.16
specific projected indentation area
ƒ
p
area of the projections of all indentations on a plane perpendicular to the longitudinal axis of the wire,
divided by the wire length and the nominal circumference
Note 1 to entry: See 5.2.
3.17
specific projected rib area
ƒ
r
area of the projections of all ribs on a plane perpendicular to the longitudinal axis of the wire, divided by the
wire length and the nominal circumference
Note 1 to entry: See 5.1.
3.18
transversal indentationless perimeter
∑e
i
sum of the distances along the surface of the core between the transverse indentations of adjacent rows
measured as the projection on a plan perpendicular to the wire axis
Note 1 to entry: See Figures 3 and 4.
3.19
transversal ribless perimeter
∑ƒ
i
sum of the distances along the surface of the core between the transverse ribs of adjacent rows measured as
the projection on a plane perpendicular to the wire axis
Note 1 to entry: See Figures 1 and 2.
3.20
passive reinforcement
reinforcement that does not apply a compressive stress to the concrete
4 Dimensions, masses and tolerances
The nominal diameter of the wire shall be in the range from 4 mm to 18 mm. Recommended nominal
diameters, d, are given in Table 1.
For nominal diameters not listed in Table 1, the mass divided by length shall be 7 850 kg/m x nominal
cross-sectional area.
Tabl
...