prEN 10370
(Main)Steel for the reinforcement of concrete - Stainless steel
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
Overview
prEN 10370 - Steel for the reinforcement of concrete - Stainless steel (CEN draft) defines how stainless steels specified in EN 10088‑1:2014 are tested, assessed and declared when used as reinforcement in concrete. The standard covers stainless bars and coils (rod, wire), factory‑made machine‑welded fabric, lattice girders, and hybrid lattice girders combining stainless and weldable reinforcing steel (per prEN 10080:2023). Surface types include ribbed, indented or smooth profiles; ribbed and indented geometries use the same bond parameters. The document also sets out exclusions (for example, pre‑stressed stainless steels, indented strip, certain composite tubes, galvanized or epoxy‑coated reinforcing steel).
Key Topics and Requirements
- Product scope and definitions linked to EN 10088‑1:2014 designations.
- Essential characteristics: mechanical properties (tensile strength, Rp0.2 / 0.2% proof strength, elongation), weldability, bendability, bond strength to concrete, shear performance of welded fabric and lattice girders, cyclic load and fatigue behaviour, strength at elevated temperature, and durability.
- Bonding: parameters based on surface geometry and bond test methods for ribbed/indented/smooth steel.
- Test methods: procedures for tensile tests, bend/weldability checks, bond and shear tests, fatigue/cyclic tests, corrosion/durability assessments (informative annexes provide corrosion test and durability guidance).
- Assessment and Verification of Constancy of Performance (AVCP): product type testing, factory production control (FPC), initial inspection, continuous surveillance and audit testing.
- Classification, designation and identification requirements for bars, coils, welded fabric and lattice girders, plus delivery and manufacturing conditions.
- Informative annexes include lattice girder test methods, corrosion tests, welding guidance, non‑magnetic/thermal properties, and design guidance (links to EN 1992/Eurocode 2).
Applications and Who Uses It
prEN 10370 is intended for:
- Structural and geotechnical engineers specifying stainless steel reinforcement for high‑durability or corrosive environments (marine, chemical plants, tunnels, bridges, coastal and infrastructure works).
- Steel manufacturers, fabricators and suppliers producing stainless reinforcing bars, welded fabric and lattice systems.
- Construction contractors, precast manufacturers and reinforcement installers who require standardized identification, testing and quality control.
- Testing laboratories and conformity assessment bodies implementing AVCP, FPC and product‑type testing.
- Standards committees and procurement officials referencing harmonized test/assessment methods.
Related Standards
- EN 10088‑1:2014 - stainless steel definitions and designations (referenced).
- prEN 10080:2023 - weldable reinforcing steel (for hybrid lattice girders).
- EN 1992 (Eurocode 2) - referenced in annexes for symbols and design integration.
Keywords: prEN 10370, stainless steel reinforcement, ribbed reinforcing steel, bond strength, welded fabric, lattice girders, AVCP, FPC, corrosion resistance, EN 10088‑1.
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
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.
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
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
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
European foreword
This document (prEN 10370:2023) has been prepared by Technical Committee CEN/TC 459 “ECISS -
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.
Through its sub-committee SC 4 “Concrete reinforcing and prestressing steels” (secretariat: DIN)
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)
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
distance between the lowest point of the lower chord and the highest point of the upper chord
3.8
design width of a lattice girder, B
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.
3.20
minimum value
value below which no test result shall fall
3.21
maximum value
value which no test result shall exceed
3.22
nominal cross-sectional area, A
n
cross-sectional area equivalent to the area of a circular plain bar of the same nominal diameter,
nd
nom
d ie. .
nom
3.23
overall height of a lattice girder, H
distance between the lowest point and the highest point of a lattice girder
3.24
overall width of a lattice girder, B
distance between the outlying points of a lattice girder
3.25
overhang of welded fabric, u1, u2, u3, u4
length of longitudinal or transverse wires projecting beyond the centre of the outer crossing wire in a
sheet of welded fabric
3.26
pitch of diagonals, P
s
distance between equivalent consecutive junction points of the diagonals with the chords
3.27
pitch of welded fabric
centre-to-centre distance of wires in a sheet of welded fabric
3.28
production lot
an uninterrupted period of production
3.29
purpose made lattice girder
lattice girder manufactured according to user's specific requirements
3.30
purpose made welded fabric
welded fabric manufactured according to user's specific requirements
3.31
reinforcing steel
steel product with a circular or practically circular cross-section which is suitable for the reinforcement
of concrete
3.32
relative indentation area f
P
area of the projection of all indentations on a plane perpendicular to the longitudinal axis of the bar, rod
or wire, divided by the indentation spacing and the nominal circumference
3.33
relative rib area, f
R
area of the projection of all ribs on a plane perpendicular to the longitudinal axis of the bar, rod or wire,
divided by the rib spacing and the nominal circumference
3.34
ribbed reinforcing steel
reinforcing steel with at least two rows of transverse ribs, which are uniformly distributed over the entire
length
3.35
rib height h
distance from the highest point of the rib (transverse or longitudinal) to the surface of the core, to be
measured normal to the axis of the bar, rod or wire
3.36
rib or indentation spacing, c
distance between the centres of two consecutive transverse ribs measured parallel to the axis of the bar,
rod or wire
3.37
semi-finished product
ribbed or indented product which requires further processing in order to achieve the standard and
special properties specified in this document for reinforcing steels
3.38
special property
property contained in this document which is not determined as part of the factory production control
requirements for every test unit
3.39
standard lattice girder
lattice girder manufactured according to specified delivery conditions and available from stock
3.40
standard property
property which is contained in this document as part of the factory production control requirements for
every test unit
3.41
standard welded fabric
welded fabric manufactured according to specified delivery conditions and available from stock
3.42
transverse rib
any rib on the surface of the bar, rod or wire other than a longitudinal rib
3.43
transverse rib flank inclination, α
angle of the rib flank measured perpendicular to the longitudinal axis of the rib
3.44
transverse wire
reinforcing steel perpendicular to the manufacturing direction of the welded fabric
3.45
welded fabric
arrangement of longitudinal and transverse bars, rods or wires of the same or different nominal diameter
and length that are arranged substantially at right angles to each other and factory electrical resistance
welded together by automatic machines at all points of intersection
3.46
width of a welded fabric sheet, B
dimension of the shortest side of the sheet of welded fabric, irrespective of the manufacturing direction
3.47
bar
product of plain round or ribbed cross-section
Note 1 to entry: Symbols, unit and abbreviated terms used in this European Standard are listed in Table 1.
Note 2 to entry: For comparison of symbols used in this European Standard with those used in EN 1992-1-1 and
EN 1992-1-2 see Annex F.
Table 1 — Symbols, unit and abbreviated terms
Symbol Description Unit
a
x Average value of test results
α Transverse rib flank inclination °
ϑ Inclination of the diagonals in lattice girder or in hybrid lattice girder °
a
a1, a2, a3, a4 Increment (specified in the product specification)
ACh Cross-sectional area of chord mm
A Cross-sectional area of diagonal mm
Di
Agt Percentage total elongation at maximum force %
A Nominal cross-sectional area mm
n
b Width of indentation mm
B Length of transverse wire in welded fabric mm
B Design width of lattice girder or hybrid lattice girder mm
B2 Overall width of lattice girder or hybrid lattice girder mm
c Transverse rib or indentation spacing mm
Cv Specified characteristic value
d Nominal diameter of the reinforcing steel mm
nom
dC Diameter of transverse wires in welded fabric mm
Symbol Description Unit
d Diameter of longitudinal wires in welded fabric mm
L
e Gap between rib or indentation rows mm
b
E Young’s modulus MPa
Fd Shear force of a clamped joint in lattice girder or hybrid lattice girder kN
f Relative indentation area -
P
fR Relative rib area -
F Shear force of a single weld in lattice girder or hybrid lattice girder kN
w
h Rib height mm
H Design height of lattice girder or hybrid lattice girder mm
H2 Overall height of lattice girder or hybrid lattice girder mm
k Coefficient as a function of the number of test results -
Llg Length of lattice girder or hybrid lattice girder mm
L Length of longitudinal wire in welded fabric mm
wf
NC Number of transverse wires in welded fabric -
N Number of longitudinal wires in welded fabric -
L
PC Pitch of transverse wires in welded fabric mm
P Pitch of longitudinal wires in welded fabric mm
L
Ps Pitch of diagonals of lattice girder or hybrid lattice girder mm
b
R7.0 strength at 7 % total elongation MPa
b
R Tensile strength MPa
m
Rm/Rp0.2 Ratio tensile strength/0,2 % proof strength -
b
R 0,2 % proof strength (tensile yield strength) MPa
p0,2
b
Rp0.2act Actual value of 0,2 % proof strength MPa
R /R Ratio actual value of 0,2 % proof strength/specified value of 0,2 % proof strength -
p0.2act p0.2nom
b
Rp0.2Ch 0,2 % proof strength of the chord in lattice girder or in hybrid lattice grider MPa
b
R 0,2 % proof strength of the diagonal in lattice girder or in hybrid lattice girder MPa
p0.2Di
b
Rp0.2nom Specified value of 0,2 % proof strength MPa
a
s Estimate of the standard deviation
ß Angle of transverse rib or indentation inclination °
t Depth of indentation mm
Overhang of the longitudinal wires in welded fabric or length of the diagonals beyond
u1, u2 mm
the upper or lower chord of a lattice girder or hybrid lattice girder
u3, u4 Overhang of the transverse wires in welded fabric mm
a
The unit depends on the property.
b 2
1 MPa = 1 N/mm .
4 Essential characteristics
4.1 General information
Table 2, for information only, summarizes the tensile product characteristics of the voluntary standards,
national regulations and Eurocodes in force in the European countries.
Table 2 — Tensile properties (informative)
Properties Ductility Classes
A B C
Characteristic value of
a, b
0,2 % Proof Strength R 400 to 750
p0,2
[MPa]
Characteristic values of
Ratio tensile strength ≥ 1,15
≥ 1,05 ≥ 1,08
c
0,2 % Proof Strength ˂1,35
Rm/Rp0,2
Characteristic values of
Elongation at maximum ≥ 2,5 ≥ 5,0 ≥ 7,5
load A (%)
gt
a
In EN 1992-1-1 the minimum prof strength range is 400 ÷ 700 [MPa]
b
In EN 1992-1-1 the maximum actual proof stress Rp0.2, shall not exceed (1,3 x Rp0.2), where Rp0.2 is the
characteristic value.
c
In the case of austenitic and duplex stainless steels, because of their specific stress-strain constitutive
relationship, the ratio is calculated by using the value of R7.0 instead of Rm.
In this standard, the specified values for the tensile properties (R , R , R / R , A ,) shall be the
m p0.2 m p0.2 gt
corresponding specified characteristic value with p = 95 % for R and R , and p = 90 % for A , R / R .
m p0.2 gt m p0.2
The values R and R shall be calculated using the nominal cross-sectional area of the product.
p0.2 m
For stainless steel the 0,2 % proof strength (R ) shall be assumed as the tensile yield strength
p0.2
4.2 Elongation at maximum load
The elongation at maximum load (A %) is determined according to 5.2. The determined characteristic
gt
value for elongation at maximum load shall be the lower limit (fractile p) of the confidence interval at
which there is a 90 % probability (1 - α = 0, 90) that 90 % (p = 0,90) of the individual measured values
are at or above this lower limit with at least A (%) ≥ 2,5 %. This definition refers to the long-term quality
gt
level of production. The declared performance is the corresponding specified characteristic value.
4.3 Weldability
The weldability of stainless steel for the reinforcement of concrete is a function of the chemical
composition and determined according to 5.3. The list of the stainless steel designations is given in
EN 10088-1:2014 (see examples in Table 3). For each designated chemical composition according to
EN 10088-1:2014 each individual element shall comply with the specified maximum values. The declared
performance is the steel class designated according to EN 10088-1:2014.
The chemical compositions of the stainless steel used for the reinforcement of concrete are listed in the
relevant Tables of EN 10088-1:2014.
Table 3 — List of the stainless steels mostly used for the reinforcement of concrete
Steel Designation
Steel number Steel name
1.4003 X2CrNi12
1.4062 X2CrNi22-2
1.4162 X2CrMnNiN21-5-1
1.4301 X5CrNi18-10
1.4311 X2CrNiN18-10
1.4315 X5CrNiN19-9
1.4401 X5CrNiMo17-12-2
1.4406 X2CrNiMoN17-11-2
1.4362 X2CrNiN23-4
1.4429 X2CrNiMoN17-13-3
1.4436 X3CrNiMo17-13-3
1.4462 X2CrNiMoN22-5-3
1.4482 X2CrMnNiMoN21-5-3
1.4571 X6CrNiMoTi17-12-2
NOTE 1 Stainless steel selection for suitability to the application involved by agreement between the
manufacturer and the purchaser is an important consideration in achieving the desired corrosion resistance or
controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.
NOTE 2 Annex E contains guidance on welding procedures.
4.4 Sections and tolerances on sizes
4.4.1 Bars and coils
The nominal diameters, the cross-sectional area and the deviation Δm (%) of the measured mass per
meter from nominal mass per meter shall be determined according to 5.4. The declared performance is
the minimum and maximum value for the deviation of measured mass per meter Δm [%] from nominal
mass per meter complying at least with the ranges specified in Table 4.
The nominal length of bars shall be agreed at the time of enquiry and order. The permissible deviation
from the nominal length shall be agreed at the time of enquiry and order.
The nominal coil mass shall be agreed at the time of enquiry and order. The permissible deviation from
the nominal coil mass shall be agreed at the time of enquiry and order.
Table 4 — Nominal diameters and the cross-sectional area and tolerances on mass per meter
run
Tolerances on mass per
a
Nominal diameter Nominal cross-sectional area
metre run
(mm) (mm )
Δm %
3 7,1
4 12,6
4,5 15,9
5 19,6 ±9,0
5,5 23,8
6 28,3
6,5 33,2
7 38,5
7,5 44,2
8 50,3
8,5 56,7
9 63,6 ±6,0
9,5 70,9
10 78,5
11 95,0
12 113,1
14 153,9
16 201,1
20 314,2
22 380,0
24 452,4
25 490,9
26 530,7
28 615,8
±4,5
30 706,9
32 804,2
34 907,9
35 962,1
40 1256,6
43 1452,2
50 1963,5
63,5 3166,9
Tolerances on mass per
a
Nominal diameter Nominal cross-sectional area
metre run
(mm) (mm )
Δm %
a
On the base of the nominal diameter the nominal mass per meter (Mpm) can be calculated with the
following formula:
d
ρ
nom
M ×π×
pm
2 1000
where:
M is the mass per meter in kg
pm
dnom is the nominal diameter in mm
ρ is the material density in kg/dm as reported in EN 10088-1:2014.
4.4.2 Welded fabric
The declared performance is the range of maximum deviation from the nominal values:
— Maximum deviation from nominal length Δl [mm or %]. The permitted deviation is ±25 mm
or ±0,5 % whichever is greater;
— Maximum deviation from nominal width Δw [mm or %]. The permitted deviation is ±25 mm
or ±0,5 % whichever is greater;
— Maximum deviation from nominal pitch Δp [mm or %]. The permitted deviation is ±15 mm or ±7,5 %
whichever is greater. The pitch of longitudinal wires and transverse wires shall not be less than
50 mm. The centre-to-centre distance for double bars shall be at least 100 mm;
— Maximum deviation from nominal overhang Δo [mm or %]. The overhang should not be less than
25 mm.
Tolerances in the separation of wires/bars should not under any circumstances lead to a reduction in the
number of wires/bars in the specified welded fabric.
4.4.3 Lattice girders and hybrid lattice girders
The declared performance is the range of maximum deviation from the nominal values:
— Maximum deviation from nominal length ΔL [mm or %]. The permitted deviations for the lattice
girders are ±40 mm if L ≤ 5,0 m and ±0,8 %, if L > 5,0 m;
— Maximum deviation from nominal height ΔH1 and ΔH2 [mm]. The permitted deviations for the lattice
girders are 〖_(−3)^(+1)〗 mm;
— Maximum deviation from nominal width ΔB1 and ΔB2 [mm]. The permitted deviations for the lattice
girders are ±7,5 mm;
— Maximum deviation from nominal pitch ΔPs [mm]. The permitted deviations for the lattice girders
are ±2,5 mm;
— Maximum overhang: may be agreed at the time of enquiry and order.
=
4.5 Bendability
Bendability is determined by bend tests according to 5.5 with mandrel diameters no greater than those
specified in Table 5.
The declared performance is the maximum mandrel diameter d fulfilled for the specified number of
m,max
individual tests not exceeding the maximum values specified in Table 5.
Table 5 — Mandrel diameter for the bend test
Nominal diameter o
...
Frequently Asked Questions
prEN 10370 is a draft published by the European Committee for Standardization (CEN). Its full title is "Steel for the reinforcement of concrete - Stainless steel". This standard covers: 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.
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.
prEN 10370 is classified under the following ICS (International Classification for Standards) categories: 77.140.15 - Steels for reinforcement of concrete. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN 10370 is associated with the following European legislation: EU Directives/Regulations: 305/2011; Standardization Mandates: M/115 REV. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase prEN 10370 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
The standard prEN 10370:2023 plays a pivotal role in the construction industry, particularly concerning the application of stainless steel for the reinforcement of concrete. Its scope is meticulously defined, specifying the product characteristic test and assessment methods for stainless steel as per EN 10088-1:2014. The inclusion of ribbed or indented surfaces in the standard ensures that a comprehensive range of stainless steel products-including bars, coils, sheets of factory-made machine-welded fabric, and hybrid lattice girders-is adequately covered. One of the notable strengths of this standard is its emphasis on clear and consistent bonding parameters for both ribbed and indented steel surfaces, thereby eliminating confusion regarding the differences between the geometries. This standardization not only facilitates a better understanding among manufacturers and engineers but also enhances the reliability and performance of stainless steel reinforcement in concrete applications. The clarity in the test methods and the expression of results contributes to the integrity and quality of stainless steel products utilized in construction. Moreover, the specificity of the materials covered under this standard reinforces its relevance in ensuring safety and structural reliability in reinforced concrete applications. Furthermore, the exclusions specified in the document-such as pre-stressed stainless steels and epoxy-coated reinforcing steel-highlight its focused approach, establishing clear boundaries for application while maintaining the quality standards essential for construction projects. Overall, prEN 10370:2023 is a vital standard that supports the effective use of stainless steel in concrete reinforcement, ensuring durability and long-term performance in construction.
Le document prEN 10370 spécifie des méthodes de test/évaluation des caractéristiques des produits en acier inoxydable destinés à renforcer le béton. Ce standard est pertinent dans le contexte actuel où la durabilité des matériaux de construction est cruciale. Il s'applique à une gamme variée de produits en acier inoxydable, y compris des barres, des bobines, des feuilles de tissu soudé en machine, et des poutres en treillis, offrant ainsi une large couverture pour les applications de renforcement. Une des forces de cette norme est sa clarté dans le choix et l'évaluation des méthodes de test, notamment en ce qui concerne l'utilisation d'aciers inoxydables à surfaces nervurées ou encreux. Cela garantit que les utilisateurs disposent d'un cadre cohérent pour évaluer la performance du matériau, indépendamment de la géométrie de surface, car il n’y a pas de distinction entre les aciers nervurés et encrés dans les paramètres d'adhérence utilisés. L'exclusion de certains types d'aciers, tels que les aciers inoxydables précontraints et les aciers recouverts d'époxy, permet de concentrer le standard sur des produits spécifiques, renforçant ainsi sa pertinence pour les applications ciblées. En s'appuyant sur la norme EN 10088-1:2014, la prEN 10370 établit une base solide pour l'évaluation des caractéristiques des aciers inoxydables, ce qui est essentiel pour garantir la sécurité et la performance des structures en béton renforcé. En résumé, le prEN 10370 représente un standard essentiel pour assurer le bon usage des aciers inoxydables dans le renforcement du béton, offrant ainsi un cadre fiable pour les concepteurs, les ingénieurs et les fabricants d'acier.
Die Norm prEN 10370 befasst sich mit der Verwendung von Edelstahl als Bewehrungsmaterial für Beton. Die Dokumentation bietet klare Vorgaben bezüglich der Produktmerkmale, Prüfmethoden und der Auswertung von Testergebnissen. Dies ist besonders relevant für Ingenieure und Hersteller, die sicherstellen möchten, dass ihre Produkte den festgelegten Qualitätsstandards entsprechen. Die Norm gilt für Edelstähle mit geriffelten oder genuteten Oberflächen, darunter Stangen, Coils, maschinell geschweißte Gewebe und Gitterträger, die aus Edelstahl bestehen. Diese Breite des Anwendungsbereichs zeigt die Vielseitigkeit des Materials und dessen Einsatzmöglichkeiten in der modernen Bauindustrie. Die explizite Erwähnung von Produkten wie Gitterträgern, die Hybridmaterialien beinhalten, zeigt, dass die Norm auch Zukunftstechnologien berücksichtigt. Ein weiterer wichtiger Punkt der Norm ist die Definition der Oberflächenstruktur von Bewehrungsstahl. Es wird klargestellt, dass die Erhebungen zwischen den Vertiefungen des genuteten Bewehrungsstahls die gleiche Funktion wie die Querriefen des geriffelten Bewehrungsstahls erfüllen. Diese Klarstellung vereinfacht die Handhabung der Norm in der Praxis, da keine strikten Differenzierungen zwischen den beiden Oberflächenstrukturen notwendig sind. Dadurch wird die Anwendung der Norm effizienter und anwenderfreundlicher. Die Stärken der prEN 10370 liegen vor allem in der klaren Strukturierung der Tests und der systematischen Darstellung der Ergebnisse, die für die Qualitätssicherung unerlässlich sind. Die Norm legt fest, dass bestimmte Produkte von den Regelungen ausgeschlossen sind, wie zum Beispiel vorgespannte Edelstähle oder galvanisierte Bewehrungsstähle. Dies sorgt für eine klare Abgrenzung und hilft Fachleuten, sich auf die relevanten Materialien zu konzentrieren. Insgesamt ist die Norm prEN 10370 ein bedeutendes Dokument für die Branche, das die Verwendung von Edelstahl in der Bewehrung von Beton sicherstellt und fördert. Ihre Relevanz liegt nicht nur in der Definition von Eigenschaften und Prüfstandards, sondern auch in der Unterstützung von Innovationen und der höchsten Qualität in der Bauwirtschaft. Die Einhaltung dieser Norm ist entscheidend für die Gewährleistung der Langlebigkeit und Sicherheit von Betonbauwerken.
oSIST prEN 10370:2023 표준 문서는 건축 구조물의 핵심 요소인 콘크리트 강화용 스테인리스강에 대한 규정을 상세히 정의하고 있습니다. 이 표준은 EN 10088-1:2014에 명시된 스테인리스강 제품의 특성 검사 및 평가 방법과 검사 결과 표현 방식을 제시하고 있으며, 스테인리스강 제품의 표면이 리브 또는 인덴트 형태일 때 적용됩니다. 이 표준의 주요 강점은 스테인리스강의 다양한 형태에 대한 포괄적인 다루임입니다. 스테인리스강 바, 코일, 기계 용접 패브릭 시트, 그리고 스테인리스강과 용접 가능한 보강강이 결합된 격자 보 형식의 제품까지 포함됩니다. 이로써 건축 산업에서 스테인리스강의 다양한 적용 가능성을 높이고 견고한 구조물 설계를 지원합니다. 또한, 본 문서는 리브, 인덴트, 혹은 매끄러운 표면을 가진 강철의 특성을 고려하여 동일한 결합 매개변수를 적용하는 점에서 중요한 의미를 갖습니다. 이는 설계자와 엔지니어가 스테인리스강 제품을 보다 일관되게 평가하고 사용할 수 있도록 돕습니다. 그럼에도 불구하고, 이 문서는 프리스트레스트 스테인리스강, 인덴트 스트립, 탄소강 부스러기로 채워진 스테인리스강 튜브, 용접재가 도포된 스테인리스강 매끄러운 바, 아연 도금된 보강강, 에폭시 코팅된 보강강 등 특정 제품에는 적용되지 않는 점도 주목할 만합니다. 이러한 명확한 범위 설정은 사용자에게 표준이 적용될 수 있는 제품의 유형을 명확히 하여 혼란을 줄이는 데 기여합니다. 종합적으로, oSIST prEN 10370:2023 표준은 스테인리스강의 응용과 평가에서 중요한 기준을 마련하고 있으며, 콘크리트 보강 설계에 있어 신뢰할 수 있는 자료를 제공함으로써 업계의 품질 향상과 안전성을 증진하는 데 굉장히 적합한 규정입니다.
この標準化文書であるoSIST prEN 10370:2023は、コンクリート補強用のステンレス鋼に関する重要なガイドラインを提供しています。この文書は、EN 10088-1:2014で定義された製品特性の試験および評価方法、並びに試験結果の表現方法を詳述しています。ここで取り扱われるステンレス鋼製品は、リブまたはインデンテッド（くぼみのある）表面を持つものであり、具体的には棒鋼とコイル、工場製の機械溶接ファブリックシート、ステンレス鋼と溶接可能な補強鋼で構成されるラティス桁及びハイブリッドラティス桁が含まれます。 この標準の強みは、リブとインデンテッド表面の鉄鋼に関する明確な試験方法と結果の表現が確立されている点です。特に、リブとインデンテッド鋼の間における結合パラメータが同一視されていることで、異なる形状間の整合性が保たれています。これにより、ステンレス鋼の補強材の使用に関して、一貫した品質基準が確立されています。 ただし、この文書はプレストレスト鋼、インデンテッドストリップ、カーボンスチールスワーフで満たされたステンレス鋼パイプ、溶接材料が施されたステンレス鋼の滑らかな棒、亜鉛メッキ補強材、エポキシコーティングされた補強材には適用されないことも明記されています。これにより、規格の適用範囲が明確にされており、利用者が必要な情報を容易に見つけることができるようになっています。 全体として、oSIST prEN 10370:2023は、コンクリート補強におけるステンレス鋼の標準化における重要な基準を提供しており、その適用範囲と詳細な試験方法は、業界の信頼性と安全性を高めるものです。
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