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 and designated as in EN 10088-1 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 EN 10080.
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 und Bewertung von Prüfergebnissen von nichtrostendem Stahl definiert und bezeichnet nach EN 10088-1 fest, der für die Bewehrung von Betonbauwerken verwendet wird. Stähle nach dieser Europäischen Norm 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 EN 10080.
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 l'armature du béton - 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 définis dans l’EN 10088-1 et désignés dans l’EN 10088-1 pour l’utilisation dans l’armature du béton.
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 à l’EN 10080.
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.

Jekla za armiranje betona - Nerjavno jeklo

General Information

Status
Not Published
Public Enquiry End Date
31-Jul-2019
Technical Committee
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
13-Jun-2019
Due Date
31-Oct-2019
Completion Date
05-Aug-2019

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SLOVENSKI STANDARD
oSIST prEN 10370:2019
01-julij-2019
Jekla za armiranje betona - Nerjavno jeklo
Steel for the reinforcement of concrete - Stainless steel
Stahl für die Bewehrung von Beton - Nichtrostender Stahl
Aciers pour l'armature du béton - Aciers inoxydables
Ta slovenski standard je istoveten z: prEN 10370
ICS:
77.140.15 Jekla za armiranje betona Steels for reinforcement of
concrete
77.140.20 Visokokakovostna jekla Stainless steels
oSIST prEN 10370:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10370:2019
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oSIST prEN 10370:2019
DRAFT
EUROPEAN STANDARD
prEN 10370
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey 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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10370:2019 E

worldwide for CEN national Members.
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Contents Page

European foreword ....................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms, definitions, symbols, units and abbreviated terms ............................................................. 8

4 Product characteristics .............................................................................................................................. 14

4.1 Elongation at maximum load ................................................................................................................... 14

4.2 Weldability ..................................................................................................................................................... 14

4.3 Sections and tolerances on sizes (of bars and coils) ....................................................................... 14

4.3.1 Bars and coils ................................................................................................................................................. 14

4.3.2 Welded fabric ................................................................................................................................................ 16

4.3.3 Lattice girders and hybrid lattice girders ........................................................................................... 16

4.4 Bendability (of the bars)............................................................................................................................ 16

4.5 Bond strength (surface geometry) ......................................................................................................... 17

4.5.1 Surface geometry ......................................................................................................................................... 17

4.5.2 Surface geometry of indented steel ....................................................................................................... 18

4.6 Shear force (only for lattice girder and welded fabric) .................................................................. 19

4.6.1 Lattice girders and hybrid lattice girders ........................................................................................... 19

4.6.2 Welded or clamped joints of welded fabric ........................................................................................ 19

4.7 Stress ratio (R / R )................................................................................................................................ 19

m p0,2

4.8 R - 0,2 % proof strength (tensile yield strength) ......................................................................... 19

p0,2

4.9 R - Tensile strength ................................................................................................................................... 20

4.10 Cyclic load performance (low cycle fatigue) (for bars and coils) ............................................... 20

4.11 Fatigue (high cycle fatigue) (for bars and coils) ............................................................................... 20

4.12 Strength at elevated temperature (tensile strength) ...................................................................... 20

4.13 Durability ........................................................................................................................................................ 20

4.14 Chemical composition - Steel numbers and names ......................................................................... 20

5 Testing, assessment and sampling methods ...................................................................................... 21

5.1 Elongation at maximum load ................................................................................................................... 22

5.2 Weldability ..................................................................................................................................................... 22

5.3 Sections and tolerances on sizes............................................................................................................. 22

5.4 Bendability ..................................................................................................................................................... 22

5.5 Bond strength (surface geometry) ......................................................................................................... 22

5.6 Shear force (only for lattice girder and welded fabric) .................................................................. 22

5.7 Stress ratio (tensile strength/tensile yield strength) (tensile strength / R for

p0,2

stainless steel) ............................................................................................................................................... 22

5.8 R - 0,2 % proof strength (tensile yield strength) ......................................................................... 22

p0,2

5.9 R tensile strength ....................................................................................................................................... 23

5.10 Cyclic load performance (low cycle fatigue) (for bars and coils) ............................................... 23

5.11 Fatigue (high cycle fatigue) (for bars and coils) ............................................................................... 23

5.12 Strength at elevated temperature (tensile strength) ...................................................................... 23

5.13 Durability ........................................................................................................................................................ 23

5.14 Chemical composition ................................................................................................................................ 23

6 Assessment and verification of constancy of performance (AVCP) ........................................... 23

6.1 General ............................................................................................................................................................. 23

6.2 Type testing .................................................................................................................................................... 24

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6.2.1 General ............................................................................................................................................................. 24

6.2.2 Test samples, testing and compliance criteria ................................................................................... 24

6.2.3 Test report ...................................................................................................................................................... 29

6.3 Factory production control (FPC) ........................................................................................................... 30

6.3.1 General ............................................................................................................................................................. 30

6.3.2 Requirements ................................................................................................................................................. 30

6.4 Initial inspection of factory and of factory production control (FPC) ....................................... 36

6.5 Continuous surveillance of FPC ............................................................................................................... 37

6.5.1 General ............................................................................................................................................................. 37

6.5.2 Audit testing of samples taken before placing the product on the market ............................. 37

6.6 Assessment of the long term quality level ........................................................................................... 40

6.6.1 General ............................................................................................................................................................. 40

6.6.2 Evaluation of the test results .................................................................................................................... 41

7 Classification and designation ................................................................................................................. 43

7.1 Bars and coils ................................................................................................................................................. 43

7.2 Welded fabric ................................................................................................................................................. 43

7.3 Lattice girders and hybrid lattice girders ............................................................................................ 45

8 Identification of the manufacturer and the product ........................................................................ 49

8.1 General ............................................................................................................................................................. 49

8.2 Bar ...................................................................................................................................................................... 50

8.2.1 Identification of the manufacturer ......................................................................................................... 50

8.2.2 Identification of the product ..................................................................................................................... 51

8.3 Coil ..................................................................................................................................................................... 53

8.4 Welded fabric ................................................................................................................................................. 53

8.5 Lattice girders ................................................................................................................................................ 53

9 Verification of mechanical properties in the case of dispute ....................................................... 53

10 Manufacturing process and delivery conditions ............................................................................... 54

10.1 Steelmaking and manufacturing processes ........................................................................................ 54

10.2 Delivery conditions ...................................................................................................................................... 54

10.2.1 Chemically and/or mechanically descaled .......................................................................................... 54

10.2.2 Not descaled .................................................................................................................................................... 55

Annex A (informative) Examples of weld points in lattice girder joints .................................................. 56

Annex B (normative) Test methods for lattice girders .................................................................................. 57

B.1 General ............................................................................................................................................................. 57

B.2 Measurement of the dimensions of the lattice girder ..................................................................... 57

B.2.1 Test piece ......................................................................................................................................................... 57

B.2.2 Test equipment .............................................................................................................................................. 57

B.2.3 Measuring procedure .................................................................................................................................. 57

B.3 Shear test ......................................................................................................................................................... 57

B.3.1 Shear test on weld points ........................................................................................................................... 57

B.3.2 Shear test on clamped joints ..................................................................................................................... 59

B.4 Test apparatus ............................................................................................................................................... 60

B.4.1 Tensile testing machine ............................................................................................................................. 60

B.4.2 Holder ............................................................................................................................................................... 61

B.4.3 Test piece ......................................................................................................................................................... 61

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B.4.4 Test procedure .............................................................................................................................................. 61

Annex C (informative) Guidance on durability ................................................................................................. 62

C.1 General ............................................................................................................................................................. 62

C.2 Terminology ................................................................................................................................................... 62

C.3 Prescriptive guidance ................................................................................................................................. 63

C.4 Performance guidance ............................................................................................................................... 65

C.4.1 Performance guidance for carbonation induced corrosion ......................................................... 65

C.4.2 Performance guidance for chloride induced corrosion ................................................................. 65

C.4.3 Performance guidance for chloride induced corrosion in carbonated concrete .................. 65

C.5 Test method for determining the corrosion resistance of stainless steel

reinforcement in chloride contaminated concrete .......................................................................... 66

C.5.1 Test method ................................................................................................................................................... 66

C.5.2 Adaptations and limitations ..................................................................................................................... 66

Annex D (informative) Corrosion test method ................................................................................................. 68

D.1 Scope ................................................................................................................................................................. 68

D.2 Materials .......................................................................................................................................................... 68

D.2.1 Rebars .............................................................................................................................................................. 68

D.2.2 Mortar .............................................................................................................................................................. 68

D.3 Specimens ....................................................................................................................................................... 68

D.4 Testing procedure ........................................................................................................................................ 70

D.5 Test results ..................................................................................................................................................... 70

D.6 Final evaluation criteria ............................................................................................................................ 70

D.7 Test report ...................................................................................................................................................... 70

Annex E (informative) Guidance on welding procedures, non-magnetic properties and

thermal expansion ....................................................................................................................................... 72

E.1 Welding procedures .................................................................................................................................... 72

E.1.1 Ferritic stainless steel ................................................................................................................................ 72

E.1.2 Austenitic stainless steel ........................................................................................................................... 72

E.1.3 Austenitic- ferritic (Duplex) stainless steel ........................................................................................ 72

E.1.4 Welding stainless steels to carbon steels ............................................................................................ 72

E.1.5 Handling and processing ........................................................................................................................... 72

E.2 Guidance on non-magnetic properties ................................................................................................. 73

E.3 Guidance on thermal expansion and other physical properties ................................................. 73

Annex F (informative) Comparison of symbols used in this European standard with those

used in EN 1992-1-1 and EN 1992-1-2 .................................................................................................. 74

Annex G (informative) Design guidance: constitutive relationship ......................................................... 75

G.1 Background .................................................................................................................................................... 75

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G.2 Recommendations ........................................................................................................................................ 76

Annex ZA (informative) Relationship of this European Standard with Regulation (EU)

No.305/2011 .................................................................................................................................................. 77

Bibliography ................................................................................................................................................................. 81

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European foreword

This document (prEN 10370:2019) has been prepared by Technical Committee CEN/TC 459/SC 4

“Concrete reinforcing and prestressing steels”, the secretariat of which is held by DIN.

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 Construction Product Regulation (EU 305/2011).

For relationship with EU Regulation (EU 305/2011), see informative Annex ZA, which is an integral part

of this document.
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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 and designated as in EN 10088-1 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 EN 10080.
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

undates references, the latest edition of the referenced document (including any amendments) applies.

EN 10020, Definition and classification of grades of steel
EN 10079, Definition of steel products

EN 10080, Steel for the reinforcement of concrete - Weldable reinforcing steel - General

EN 10088-1:2014, Stainless steels - Part 1: List of stainless steels

EN 10088-5, Stainless steels - Part 5: Technical delivery conditions for bars, rods, wire, sections and bright

products of corrosion resisting steels for construction purposes

EN ISO 377, Steel and steel products - Location and preparation of samples and test pieces for mechanical

testing (ISO 377)

EN ISO 6892-2, Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature (ISO

6892-2)

EN ISO 7500-1, 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)
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EN ISO 15630-1, Steel for the reinforcement and prestressing of concrete - Test methods - Part 1:

Reinforcing bars, rods and wire (ISO 15630-1)

EN ISO 15630-2, Steel for the reinforcement and prestressing of concrete - Test methods - Part 2: Welded

fabric and lattice girders (ISO 15630-2)
3 Terms, definitions, symbols, units and abbreviated terms

For the purposes of this document, the terms and definitions given in EN 10020, EN 10079 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

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, H1

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
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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; for hybrid lattice girders apply the same

definitions as for lattice girders, i.e
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
overall length of a lattice girder
3.15
lattice girder overhang, u u
1, 2

length of the diagonals beyond either the upper chord (u ) or the lower chord (u )

1 2
3.16
length of a welded fabric sheet, L

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
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