ISO 6435:2024

International
Standard
ISO 6435
First edition
Stainless steel bars for the
2024-04
reinforcement of concrete
Barres en aciers inoxydables pour l'armature du béton
Reference number
© ISO 2024
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Published in Switzerland
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Dimensions, mass per unit length and permissible deviations . 2
6 Requirements for ribs . 5
7 Chemical composition . 5
8 Mechanical properties . 7
8.1 Tensile properties .7
8.2 Bending properties .9
8.3 Rebending properties after ageing .9
8.4 Impact properties on austenitic-ferritic steels .9
8.5 Magnetic permeability.10
8.6 Corrosion resistance properties .10
9 Testing. 10
9.1 Tensile test .10
9.2 Bend test .10
9.3 Rebend test .10
9.4 Chemical composition .11
9.5 Impact property test .11
9.6 Magnetic permeability.11
9.7 Corrosion resistance test .11
10 Designation .11
11 Marking . .11
11.1 Marking on bars .11
11.2 Identification of bundles . 12
12 Testing and inspection .12
12.1 General . 12
12.2 Evaluation of conformity during production . 12
12.3 Acceptance testing of a specific delivery . 13
12.3.1 General . 13
12.3.2 Evaluation of characteristic values . . 13
12.3.3 Evaluation of specified minimum/maximum values . 15
12.3.4 Test report . 15
Annex A (informative) Options for agreement between the manufacturer and purchaser .16
Annex B (normative) Corrosion resistant test . 17
Annex C (informative) Guidance on magnetic permeability .21
Bibliography .22

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Foreword
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This document was prepared by Technical Committee Technical Committee ISO/TC 17, Steel, Subcommittee
SC 16, Steels for the reinforcement and prestressing of concrete.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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International Standard ISO 6435:2024(en)
Stainless steel bars for the reinforcement of concrete
1 Scope
This document specifies technical requirements for hot rolled stainless steel plain bars and ribbed bars
used as reinforcement in concrete.
It is applicable to steel delivered in the form of bars, coils and de-coiled products. It does not apply to ribbed
bars produced from finished products
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 6935-1, Steel for the reinforcement of concrete — Part 1: Plain bars
ISO 6935-2, Steel for the reinforcement of concrete — Part 2: Ribbed bars
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical composition
ISO 15510, Stainless steels — Chemical composition
ISO 15630-1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing
bars, rods and wire
EN 196-1, Methods of testing cement — Part 1: Determination of strength
EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6935-1, ISO 6935-2, ISO 15510 and
the following 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
stainless steel bars
stainless steel bars with at least 10,5 % (mass fraction) of chromium and max. 1,2 % (mass fraction) of carbon

4 Symbols
Symbol Unit                 Description
A % Percentage elongation after fracture
A % Percentage total extension at maximum force
gt
S mm Nominal cross-sectional area
d mm Nominal diameter of the bar
a
R MPa Tensile strength
m
a
R MPa 0,2 % proof strength, plastic extension
p0,2
a
R MPa 7,0 % proof strength, plastic extension
7,0
a 2
1 MPa = 1 N/mm .
5 Dimensions, mass per unit length and permissible deviations
Dimensions are given in Table 1, mass per unit length and permissible deviations are given in Table 2,
Table 3 and Table 4. By agreement between the manufacturer and the purchaser, the following options shall
be applied.
— Ribbed bars and plain bars for which the nominal diameters are other than those shown in Table 2 may
be used. The permissible deviation of nominal diameters larger than 50 mm shall be ±4 %.
— The permissible deviation on mass per length of plain bars may be replaced by tolerances on diameters.
A list of options for agreement between the manufacturer and the purchaser is provided in Annex B.
Table 1 — Dimensions
a
N
...