oSIST prEN 10370:2023

Steel for the reinforcement of concrete - Stainless steel

This document specifies product characteristic test/assessment method and the way of expressing test results for stainless steel as defined in EN 10088-1:2014 and designated as in EN 10088-1:2014 for the use of the reinforcement of concrete.
It applies to stainless steel products with ribbed or indented surfaces, which are in the form of:
-   bars and coils (rod, wire);
-   sheets of factory-made machine-welded fabric;
-   lattice girders and hybrid lattice girders composed by stainless steel and by weldable reinforcing steel according to prEN 10080:2023.
Steels according to this document have a ribbed, indented or smooth surface.
NOTE   The protrusions between indentations of indented reinforcing steel have the same function as transverse ribs of ribbed reinforcing steel. There is no definition, which specifies the difference between ribbed and indented surface geometry. Therefore, in this document, the same bond parameters are used for ribbed and indented steel.
This document does not apply to:
-   pre-stressed stainless steels;
-   indented strip;
-   stainless steel tube filled with carbon steel swarf, which is then hot or cold reduced;
-   stainless steel smooth bar with weld material deposited on it;
-   galvanized reinforcing steel;
-   epoxy-coated reinforcing steel.

Stahl für die Bewehrung von Beton - Nichtrostender Stahl

Diese Europäische Norm legt Leistungsmerkmale, Prüfung/Bewertung von Prüfergebnissen von nichtrostendem Stahl definiert und bezeichnet nach EN 10088-1:2014 fest, der für die Bewehrung von Betonbauwerken verwendet wird.
Die Stahlerzeugnisse haben eine gerippte oder profilierte Oberfläche und werden geliefert in Form von:
-   Stäben, Ringen (Walzdraht, Draht);
-   werkmäßig gefertigten maschinell geschweißten Matten;
-   Gitterträgern und hybriden Gitterträgern, hergestellt aus nichtrostendem Stahl und Schweißgeeignetem Betonstahl nach prEN 10080:2023.
Stähle nach dieser Europäischen Norm haben eine gerippte, profilierte oder glatte Oberfläche.
ANMERKUNG   Die Erhebungen zwischen zwei Vertiefungen bei profiliertem Betonstahl haben die gleichen Funktionen wie die Schrägrippen bei geripptem Betonstahl. Daher gibt es keine Sonderdefinition mit dem Unterschied der geometrischen Merkmale zwischen dem gerippten und profilierten Betonstahl. Die in dieser Norm enthaltenen Festlegungen für den Verbund gelten für gerippten und profilierten Betonstahl.
Diese Europäische Norm gilt nicht für:
-   nichtrostende Stähle für Vorspannen;
-   profiliertes Band;
-   nichtrostende Stahlrohre gefüllt mit unlegiertem Stahl, anschließend warm- oder kalt abgelängt;
-   geschweißte nichtrostende Stäbe aus Stahl mit glatter Oberfläche;
-   verzinkten Betonstahl;
-   epoxidbeschichteten Betonstahl.

Aciers pour béton armé - Aciers inoxydables

Le présent document spécifie les caractéristiques des produits, la méthode d’essai et d’évaluation ainsi que le mode d’expression des résultats de l’essai, pour les aciers inoxydables tels que définis dans l’EN 10088-1:2014 et désignés comme indiqué dans l’EN 10088-1:2014 pour l’utilisation du béton armé.
Il s’applique aux produits en acier inoxydable présentant une surface avec des verrous ou des empreintes sous la forme de :
-   barres et couronnes (fil machine, fil) ;
-   panneaux de treillis soudés sur machine, fabriqués en usine ;
-   treillis raidisseurs et treillis raidisseurs hybrides composés d’aciers inoxydables et d’aciers soudables pour béton armé conformément au prEN 10080:2023.
Les aciers conformes au présent document ont une surface à verrous, à empreintes ou lisse.
NOTE   Les reliefs entre les empreintes d’un acier pour béton armé à empreintes ont la même fonction que les verrous d’un acier pour béton armé à verrous. Il n’existe pas de définition qui précise la différence entre une géométrie de surface à verrous et une géométrie de surface à empreintes. Par conséquent, dans le présent document, les mêmes paramètres de liaison sont utilisés pour un acier à verrous et un acier à empreintes.
Le présent document ne s’applique pas :
-   aux armatures de précontrainte en acier ;
-   aux feuillards crantés ;
-   aux tubes d’acier inoxydable remplis de copeaux d’acier au carbone, qui sont ensuite réduits à chaud ou à froid ;
-   aux barres d’acier inoxydable lisses avec matériau soudé déposé dessus ;
-   aux aciers pour béton armé galvanisés ;
-   aux aciers pour béton armé avec revêtement époxy.

Jeklo za armiranje betona - Nerjavno jeklo

General Information

• Status: Not Published
• Public Enquiry End Date: 18-Jul-2023
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 09-May-2023
• Due Date: 26-Sep-2023
• Completion Date: 02-Aug-2023
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/115 REV - Revised mandate M/115 to CEN/CENELEC concerning the execution of standardisation work for harmonized standards on reinforcing and prestressing steel (for concrete)
• Ref Project: prEN 10370 - Steel for the reinforcement of concrete - Stainless steel

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 10370:2023
01-julij-2023
Jeklo za armiranje betona - Nerjavno jeklo
Steel for the reinforcement of concrete - Stainless steel
Stahl für die Bewehrung von Beton - Nichtrostender Stahl
Aciers pour béton armé - Aciers inoxydables
Ta slovenski standard je istoveten z: prEN 10370
ICS:
77.140.15 Jekla za armiranje betona Steels for reinforcement of
concrete
oSIST prEN 10370:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10370:2023

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oSIST prEN 10370:2023


DRAFT
EUROPEAN STANDARD
prEN 10370
NORME EUROPÉENNE

EUROPÄISCHE NORM

April 2023
ICS 77.140.15
English Version

Steel for the reinforcement of concrete - Stainless steel
Aciers pour l'armature du béton - Aciers inoxydables Stahl für die Bewehrung von Beton - Nichtrostender
Stahl
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 459/SC 4.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.

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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10370:2023 E
worldwide for CEN national Members.

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oSIST prEN 10370:2023
prEN 10370:2023 (E)
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Essential characteristics . 13
4.1 General information . 13
4.2 Elongation at maximum load . 13
4.3 Weldability . 13
4.4 Sections and tolerances on sizes. 14
4.4.1 Bars and coils . 14
4.4.2 Welded fabric . 16
4.4.3 Lattice girders and hybrid lattice girders . 16
4.5 Bendability . 17
4.6 Bonding strength . 17
4.6.1 General . 17
4.6.2 Bonding strength based on surface geometry . 18
4.6.3 Bonding strength based on bond strength tests . 19
4.7 Shear force . 20
4.7.1 Welded fabric . 20
4.7.2 Lattice girders . 20
4.8 Stress ratio (R /R ) . 21
m p0.2
4.9 Rp0,2 - 0,2 % proof strength (tensile yield strength) . 21
4.10 R Tensile strength . 21
m
4.11 Cyclic load performance . 21
4.12 Fatigue . 21
4.13 Strength at elevated temperature . 22
4.14 Durability . 22
5 Test methods . 22
5.1 Test conditions . 22
5.2 Elongation at maximum load . 22
5.3 Weldability . 22
5.4 Sections and tolerances on sizes. 22
5.5 Bendability . 22
5.6 Bonding strength . 23
5.6.1 Bonding strength based on surface geometry . 23
5.6.2 Bonding strength based on bond strength tests . 23
5.7 Shear force . 23
5.8 Stress ratio (tensile strength/tensile yield strength) (tensile strength/R for
p0,2
stainless steel) . 23
5.9 R - 0,2 % proof strength (tensile yield strength) . 23
p0,2
5.10 R tensile strength . 23
m
5.11 Cyclic load performance . 23
5.12 Fatigue . 24
5.13 Strength at elevated temperature . 24
2

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oSIST prEN 10370:2023
prEN 10370:2023 (E)
5.14 Durability. 24
6 Assessment and verification of constancy of performance (AVCP) . 24
6.1 General . 24
6.2 Product type testing . 24
6.2.1 General . 24
6.2.2 Test samples, testing and compliance criteria . 25
6.2.3 Compliance criteria . 32
6.2.4 Re-testing . 33
6.2.5 Test report . 34
6.3 Factory production control (FPC) . 34
6.3.1 General . 34
6.3.2 Requirements . 34
6.4 Initial inspection of factory and of factory production control (FPC) . 42
6.5 Continuous surveillance of FPC . 42
6.5.1 General . 42
6.5.2 Audit testing of samples taken from the factory . 43
6.5.3 Evaluation, reporting and action . 47
6.6 Procedure for modifications . 49
7 Classification and designation . 49
7.1 Bars and coils . 49
7.2 Welded fabric . 49
7.3 Lattice girders and hybrid lattice girders . 50
8 Identification of the manufacturer and the product . 53
8.1 General . 53
8.2 Bar . 54
8.2.1 Identification of the manufacturer . 54
8.2.2 Identification of the product . 56
8.3 Coil . 57
8.4 Welded fabric . 58
8.5 Lattice girders . 58
9 Manufacturing process and delivery conditions . 58
9.1 Steelmaking and manufacturing processes . 58
9.2 Delivery conditions . 58
9.2.1 Chemically and/or mechanically descaled . 58
9.2.2 Not descaled . 59
Annex A (informative) Examples of weld points in lattice girder joints . 60
Annex B (normative) Test methods for lattice girders . 61
B.1 General . 61
B.2 Measurement of the dimensions of the lattice girder . 61
B.3 Shear test . 61
B.4 Test apparatus . 64
Annex C (informative) Guidance on durability . 66
C.1 General . 66
C.2 Terminology . 67
C.3 Prescriptive guidance . 67
C.4 Performance guidance . 68
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oSIST prEN 10370:2023
prEN 10370:2023 (E)
Annex D (informative) Corrosion Test Method . 72
D.1 Scope . 72
D.2 Materials . 72
D.3 Specimens . 72
D.4 Testing procedure . 74
D.5 Test results . 74
D.6 Final evaluation criteria . 74
D.7 Test report . 75
Annex E (informative) Guidance on welding procedures, non-magnetic properties and
thermal expansion . 76
E.1 Welding procedures . 76
E.2 Guidance on non-magnetic properties . 77
E.3 Guidance on thermal expansion and other physical properties . 77
Annex F (informative) Comparison of symbols used in this European Standard with those
used in EN 1992-1-1 and EN 1992-1-2 . 78
Annex G (informative) Design guidance: constitutive relationship . 79
G.1 Background . 79
G.2 Recommendations . 80
Annex H (normative) Bond test for ribbed and indented reinforcing steel – Beam test . 81
H.1 Scope . 81
H.2 Principle of the test . 81
H.3 Samples and specimens . 81
H.4 Test equipment . 82
H.5 Preparation of samples . 83
H.6 Execution of the tests . 84
H.7 Test results . 84
H.8 Test report . 85
H.9 Determination of declared values for τ and τ and rib geometry requirements for
bm bu
FPC and continuous surveillance . 86
Annex ZA (informative) Relationship of this European Standard with Regulation (EU) No
305/2011 . 91
ZA.1 Scope and relevant characteristics . 91
ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) of
reinforcing steels . 92
ZA.3 Assignment of AVCP tasks . 92
Bibliography . 94
4

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oSIST prEN 10370:2023
prEN 10370:2023 (E)
European foreword
This document (prEN 10370:2023) has been prepared by Technical Committee CEN/TC 459 “ECISS -
1
European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.

1
Through its sub-committee SC 4 “Concrete reinforcing and prestressing steels” (secretariat: DIN)
5

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oSIST prEN 10370:2023
prEN 10370:2023 (E)
1 Scope
This document specifies product characteristic test/assessment method and the way of expressing test
results for stainless steel as defined in EN 10088-1:2014 and designated as in EN 10088-1:2014 for the
use of the reinforcement of concrete.
It applies to stainless steel products with ribbed or indented surfaces, which are in the form of:
— bars and coils (rod, wire);
— sheets of factory-made machine-welded fabric;
— lattice girders and hybrid lattice girders composed by stainless steel and by weldable reinforcing
steel according to prEN 10080:2023.
Steels according to this document have a ribbed, indented or smooth surface.
NOTE The protrusions between indentations of indented reinforcing steel have the same function as
transverse ribs of ribbed reinforcing steel. There is no definition, which specifies the difference between ribbed and
indented surface geometry. Therefore, in this document, the same bond parameters are used for ribbed and
indented steel.
This document does not apply to:
— pre-stressed stainless steels;
— indented strip;
— stainless steel tube filled with carbon steel swarf, which is then hot or cold reduced;
— stainless steel smooth bar with weld material deposited on it;
— galvanized reinforcing steel;
— epoxy-coated reinforcing steel.
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.
EN 1766:2017, Products and systems for the protection and repair of concrete structures — Test methods
— Reference concretes for testing
EN 10020:2000, Definition and classification of grades of steel
EN 10079:2007, Definition of steel products
EN 10088-1:2014, Stainless steels — Part 1: List of stainless steels
EN 12390-3:2019, Testing hardened concrete — Part 3: Compressive strength of test specimens
EN ISO 377:2017, Steel and steel products — Location and preparation of samples and test pieces for
mechanical testing (ISO 377:2017)
6

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oSIST prEN 10370:2023
prEN 10370:2023 (E)
EN ISO 6892-2:2018, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
(ISO 6892-2:2018)
EN ISO 7500-1:2018, Metallic materials — Calibration and verification of static uniaxial testing machines
— Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring
system (ISO 7500-1:2018)
EN ISO 15630-1:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1:
Reinforcing bars, rods and wire (ISO 15630-1:2019)
EN ISO 15630-2:2019, Steel for the reinforcement and prestressing of concrete — Test methods — Part 2:
Welded fabric and lattice girders (ISO 15630-2:2019)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10020:2000, EN 10079:2007
and the following apply.
3.1
7% strength
strength at 7% total elongation, R
7.0
3.2
angle of inclination of diagonals, ϑ
angle between the axis of a diagonal and the longitudinal axis of a lattice girder in the plane of the diagonal
in the middle of the height of a lattice girder
3.3
angle of transverse rib or indentation inclination, ß
angle between the axis of the transverse rib and the longitudinal axis of the bar, rod or wire
3.4
batch
quantity of rebars, processed from an identical heat or cast, size or alloy, processed in the same
production lot, in the same process conditions or any quantity of welded fabric or lattice girders of one
type produced by one manufacturer and presented for examination at any one time
3.5
characteristic value C
v
value of a material or product property having a prescribed probability of not being attained in a
hypothetical unlimited test series
Note 1 to entry: This value generally corresponds to a specific fractile of the assumed statistical distribution of
the particular property of the material or product.
3.6
coil
single length of reinforcing steel wound in concentric rings, including coils welded together to produce a
single coiled length
3.7
design height of a lattice girder, H
1
distance between the lowest point of the lower chord and the highest point of the upper chord
7

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oSIST prEN 10370:2023
prEN 10370:2023 (E)
3.8
design width of a lattice girder, B
1
distance between the outlying points of the lower chords
3.9
hybrid lattice girder
lattice girder where the metallic structure is composed of both stainless steel used for the reinforcement
of concrete and weldable reinforcing steel.
Note 1 to entry: For hybrid lattice girders, the same definitions apply as for lattice girders.
3.10
indented reinforcing steel
reinforcing steel with defined indentations uniformly distributed over the entire length
3.11
indentation depth, t
distance between the surface of the wire and the deepest point of the indentation
3.12
indentation width, b
width of the indention to be measured parallel to the axis of the bar, rod or wire
3.13
lattice girder
two or three-dimensional metallic structure comprising an upper chord, one or more lower chords and
continuous or discontinuous diagonals which are welded or mechanically assembled to the chords
3.14
lattice girder length, L
lg
overall length of a lattice girder
3.15
lattice girder overhang, u ,u
1 2
length of the diagonals beyond either the upper chord (u1) or the lower chord (u2)
3.16
length of a welded fabric sheet, L
wf
dimension of the longest side of a sheet of welded fabric, irrespective of the manufacturing direction
3.17
longitudinal rib
uniform continuous protrusion parallel to the axis of the bar, rod or wire
3.18
longitudinal wire
reinforcing steel in the manufacturing direction of the welded fabric
3.19
lower chord
set of longitudinal reinforcing steels placed in the lower part of a lattice girder
Note 1 to entry: They form harmonic curves in the case of continuous diagonals or are independent elements in
the case of discontinuous diagonals.
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