Cold formed welded steel structural hollow sections - Part 3: Technical delivery conditions for high strength and weather resistant steels

This document specifies the technical delivery conditions for high strength and weather resistant electric welded and submerged arc welded cold formed steel structural hollow sections of circular, square, rectangular or elliptical forms and formed cold without subsequent heat treatment other than the heat treatment of the weld line.
NOTE 1   The requirements for tolerances, dimensions and sectional properties can be found in EN 10219 2.
NOTE 2   The attention of users is drawn to the fact that whilst cold formed grades in this document can have equivalent mechanical properties to hot-finished grades in EN 10210 3, the sectional properties of square and rectangular hollow sections in EN 10219 2 and EN 10210 2 are not equivalent.
NOTE 3   A range of steel grades is specified in this document and the user can select the grade most appropriate to the intended use and service conditions. The grades and mechanical properties, but not the final supply condition of cold formed hollow sections are generally comparable with those in EN 10025 3, EN 10025 4, EN 10025 5, EN 10025 6, EN 10149 2 and EN 10149 3.

Kaltgeformte geschweißte Hohlprofile für den Stahlbau - Teil 3: Technische Lieferbedingungen für höher- und wetterfeste Stähle

Dieses Dokument legt die technischen Lieferbedingungen für kaltgeformte elektrisch und unterpulvergeschweißte Hohlprofile aus höher- und wetterfesten Stählen mit kreisförmiger, quadratischer, rechteckiger oder elliptischer Form fest ohne nachfolgende Wärmebehandlung mit Ausnahme der Wärmebehandlung der Schweißnaht.
ANMERKUNG 1  Die Anforderungen an die Grenzabmaße, Maße und statischen Werte sind in EN 10219-2 festgelegt.
ANMERKUNG 2 Der Anwender wird darauf aufmerksam gemacht, dass die kaltgeformten Hohlprofile nach EN 10219-3 zwar vergleichbare mechanische Eigenschaften zu den warmgefertigten Hohlprofilen nach EN 10210-3 aufweisen können, dass aber die Maße und statischen Werte von quadratischen und rechteckigen Hohlprofilen nach EN 10210-2 und EN 10219-2 nicht vergleichbar sind.
ANMERKUNG 3 Eine Anzahl von Stahlsorten ist in dieser Norm festgelegt und der Anwender kann die geeignetste Sorte für die beabsichtigte Verwendung aussuchen. Die Sorten und die mechanischen Eigenschaften, aber nicht der Auslieferungszustand der kaltgeformten Hohlprofile sind im Allgemeinen vergleichbar mit den Sorten die in EN 10025 3, EN 10025-4, EN 10025-5, EN 10025-6, EN 10149-2 und EN 10149-3 aufgeführt sind.

Profils creux de construction en acier, soudés et formés à froid - Partie 3 : Conditions techniques de livraison des aciers à haute limite élastique et des aciers à résistance améliorée à la corrosion atmosphérique

Le présent document spécifie les conditions techniques de livraison pour les profils creux de construction formés à froid en aciers à haute limite élastique et en aciers à résistance améliorée à la corrosion atmosphérique, soudés électriquement et soudés à l’arc immergé de forme circulaire, carrée, rectangulaire ou elliptique et formés à froid sans traitement thermique ultérieur autre que le traitement thermique de la ligne de soudure.
NOTE 1   Les exigences pour les tolérances, dimensions et caractéristiques de section peuvent être trouvées dans l’EN 10219-2.
NOTE 2   L’attention des utilisateurs est attirée sur le fait que, même si les nuances formées à froid du
présent document peuvent avoir des caractéristiques mécaniques équivalentes aux nuances finies à chaud de l’EN 10210-3, les caractéristiques de section des profils creux carrés et rectangulaires de l’EN 10219-2 et de l’EN 10210-2 ne sont pas équivalentes.
NOTE 3   Une gamme de nuances d’acier est spécifiée dans le présent document, et l’utilisateur peut sélectionner la nuance la plus appropriée à l’utilisation et aux conditions de service prévues. Les nuances et caractéristiques mécaniques, mais pas l’état de livraison final des profils creux formés à froid, sont généralement comparables à celles de l’EN 10025-3, l’EN 10025-4, l’EN 10025-5, l’EN 10025-6, l’EN 10149-2 et l’EN 10149-3.

Hladno oblikovani varjeni votli konstrukcijski profili iz jekla - 3. del: Tehnični dobavni pogoji za jekla z visoko trdnostjo in vodoodporna

General Information

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Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
09-Sep-2020
Completion Date
09-Sep-2020

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SLOVENSKI STANDARD
SIST EN 10219-3:2020
01-november-2020

Hladno oblikovani varjeni votli konstrukcijski profili iz jekla - 3. del: Tehnični

dobavni pogoji za jekla z visoko trdnostjo in vodoodporna
Cold formed welded steel structural hollow sections - Part 3: Technical delivery
conditions for high strength and weather resistant steels
Kaltgeformte geschweißte Hohlprofile für den Stahlbau - Teil 3: Technische
Lieferbedingungen für Anwendungen im Maschinenbau

Profils creux de construction en acier, soudés et formés à froid - Partie 3 : Conditions

techniques de livraison pour des applications de construction mécanique
Ta slovenski standard je istoveten z: EN 10219-3:2020
ICS:
77.140.45 Nelegirana jekla Non-alloyed steels
77.140.70 Jekleni profili Steel profiles
SIST EN 10219-3:2020 en,fr,de

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

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SIST EN 10219-3:2020
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SIST EN 10219-3:2020
EN 10219-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 77.140.75
English Version
Cold formed welded steel structural hollow sections - Part
3: Technical delivery conditions for high strength and
weather resistant steels

Profils creux de construction en acier, soudés et formés Kaltgeformte geschweißte Hohlprofile für den Stahlbau

à froid - Partie 3 : Conditions techniques de livraison - Teil 3: Technische Lieferbedingungen für höher- und

des aciers à haute limite élastique et des aciers à wetterfeste Stähle
résistance améliorée à la corrosion atmosphérique
This European Standard was approved by CEN on 10 August 2020.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 23 September 2020.

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. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists 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, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10219-3:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 10219-3:2020
EN 10219-3:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms, definitions and symbols ................................................................................................................. 7

3.1 Terms and definitions ................................................................................................................................... 7

3.2 Symbols ............................................................................................................................................................... 8

4 Classification and designation .................................................................................................................... 8

4.1 Classification ..................................................................................................................................................... 8

4.2 Designation........................................................................................................................................................ 8

5 Information to be obtained by the manufacturer ............................................................................ 10

5.1 Mandatory information ............................................................................................................................. 10

5.2 Options ............................................................................................................................................................. 10

5.3 Example of an order .................................................................................................................................... 11

6 Manufacturing process ............................................................................................................................... 11

6.1 General ............................................................................................................................................................. 11

6.2 Steel manufacturing process .................................................................................................................... 11

6.3 Grain structure .............................................................................................................................................. 11

6.4 Condition of feedstock material .............................................................................................................. 11

6.5 Structural hollow section manufacturing process ........................................................................... 11

6.6 Delivery condition ....................................................................................................................................... 12

7 Requirements ................................................................................................................................................ 12

7.1 Chemical composition ................................................................................................................................ 12

7.2 Mechanical properties ................................................................................................................................ 15

7.3 Technological properties .......................................................................................................................... 16

7.4 Product supply condition .......................................................................................................................... 17

7.5 Non-destructive testing.............................................................................................................................. 17

7.6 Tolerances and mass ................................................................................................................................... 17

8 Inspection ....................................................................................................................................................... 18

8.1 Types of inspection ...................................................................................................................................... 18

8.2 Types and contents of inspection documents .................................................................................... 18

8.3 Summary of inspection .............................................................................................................................. 19

9 Frequency of testing and preparation of samples and test pieces ............................................. 20

9.1 Frequency of tests ........................................................................................................................................ 20

9.2 Selection and preparation of samples for product analysis ......................................................... 21

9.3 Location and orientation of samples for mechanical tests ........................................................... 21

9.4 Preparation of test pieces for mechanical tests ................................................................................ 22

10 Test methods ................................................................................................................................................. 22

10.1 Chemical analysis ......................................................................................................................................... 22

10.2 Mechanical tests ........................................................................................................................................... 22

10.3 Visual inspection and dimensional check ........................................................................................... 23

10.4 Non-destructive testing.............................................................................................................................. 23

10.5 Retests, sorting and reprocessing .......................................................................................................... 24

11 Marking ............................................................................................................................................................ 24

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SIST EN 10219-3:2020
EN 10219-3:2020 (E)

Annex A (informative) Structural hollow sections of non-alloy quality steels - Chemical

composition and mechanical properties ............................................................................................. 26

Annex B (normative) Structural hollow sections of normalized/normalized rolled steels -

Chemical composition and mechanical properties .......................................................................... 27

Annex C (normative) Structural hollow sections of thermomechanical formed steels -

Chemical composition and mechanical properties .......................................................................... 29

Annex D (normative) Structural hollow sections of quenched and tempered steels —

Chemical composition and mechanical properties .......................................................................... 34

Annex E (normative) Structural hollow sections of steels with improved atmospheric

corrosion resistance — Chemical composition and mechanical properties ........................... 39

Annex F (normative) Location of samples and test pieces .......................................................................... 41

Bibliography ................................................................................................................................................................. 43

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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
European foreword

This document (EN 10219-3:2020) has been prepared by Technical Committee CEN/TC 459/SC 3

“Structural steels other than reinforcements”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2021, and conflicting national standards shall

be withdrawn at the latest by March 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

EN 10219 consists of the following parts:

— EN 10219-1, Cold formed welded steel structural hollow sections - Part 1: Technical delivery

conditions

— EN 10219-2, Cold formed welded steel structural hollow sections - Part 2: Tolerances, dimensions

and sectional properties

— EN 10219-3, Cold formed welded steel structural hollow sections - Part 3: Technical delivery

conditions for high strength and weather resistant steels.

It forms part of a series of standards on hollow sections together with EN 10210-1 to EN 10210-3.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: 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, Turkey and the

United Kingdom.
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
1 Scope

This document specifies the technical delivery conditions for high strength and weather resistant

electric welded and submerged arc welded cold formed steel structural hollow sections of circular,

square, rectangular or elliptical forms and formed cold without subsequent heat treatment other than

the heat treatment of the weld line.

NOTE 1 The requirements for tolerances, dimensions and sectional properties can be found in EN 10219-2.

NOTE 2 The attention of users is drawn to the fact that whilst cold formed grades in this document can have

equivalent mechanical properties to hot-finished grades in EN 10210-3, the sectional properties of square and

rectangular hollow sections in EN 10219-2 and EN 10210-2 are not equivalent.

NOTE 3 A range of steel grades is specified in this document and the user can select the grade most appropriate

to the intended use and service conditions. The grades and mechanical properties, but not the final supply

condition of cold formed hollow sections are generally comparable with those in EN 10025-3, EN 10025-4,

EN 10025-5, EN 10025-6, EN 10149-2 and EN 10149-3.
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 1011-1, Welding - Recommendations for welding of metallic materials - Part 1: General guidance for

arc welding

EN 1011-2, Welding - Recommendations for welding of metallic materials - Part 2: Arc welding of ferritic

steels
EN 10020, Definition and classification of grades of steel
EN 10021, General technical delivery conditions for steel products
EN 10027-1, Designation systems for steels - Part 1: Steel names
EN 10027-2, Designation systems for steels - Part 2: Numerical system

EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection

method)

EN 10168, Steel products - Inspection documents - List of information and description

EN 10204, Metallic products - Types of inspection documents

EN 10219-1, Cold formed welded structural hollow sections of non-alloy and fine grain steels - Part 1:

Technical delivery conditions

EN 10219-2, Cold formed welded steel structural hollow sections - Part 2: Tolerances, dimensions and

sectional properties

CEN/TR 10261, Iron and steel - European standards for the determination of chemical composition

EN 10266, Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in

product standards

EN ISO 148-1, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-1)

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SIST EN 10219-3:2020
EN 10219-3:2020 (E)

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

testing (ISO 377)

EN ISO 643, Steels - Micrographic determination of the apparent grain size (ISO 643)

EN ISO 2566-1, Steel - Conversion of elongation values - Part 1: Carbon and low alloy steels (ISO 2566-1)

EN ISO 4885, Ferrous materials - Heat treatments - Vocabulary (ISO 4885)

EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO

6892-1)

EN ISO 9606-1, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1)

EN ISO 9712, Non-destructive testing - Qualification and certification of NDT personnel (ISO 9712)

EN ISO 10893-2, Non-destructive testing of steel tubes - Part 2: Automated eddy current testing of

seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections (ISO

10893-2)

EN ISO 10893-3, Non-destructive testing of steel tubes - Part 3: Automated full peripheral flux leakage

testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection

of longitudinal and/or transverse imperfections (ISO 10893-3)

EN ISO 10893-6, Non-destructive testing of steel tubes - Part 6: Radiographic testing of the weld seam of

welded steel tubes for the detection of imperfections (ISO 10893-6)

EN ISO 10893-7, Non-destructive testing of steel tubes - Part 7: Digital radiographic testing of the weld

seam of welded steel tubes for the detection of imperfections (ISO 10893-7)

EN ISO 10893-8, Non-destructive testing of steel tubes - Part 8: Automated ultrasonic testing of seamless

and welded steel tubes for the detection of laminar imperfections (ISO 10893-8)

EN ISO 10893-9, Non-destructive testing of steel tubes - Part 9: Automated ultrasonic testing for the

detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes (ISO

10893-9)

EN ISO 10893-10, Non-destructive testing of steel tubes - Part 10: Automated full peripheral ultrasonic

testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal

and/or transverse imperfections (ISO 10893-10)

EN ISO 10893-11, Non-destructive testing of steel tubes - Part 11: Automated ultrasonic testing of the

weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections (ISO

10893-11)

EN ISO 14713-2:2009, Zinc coatings - Guidelines and recommendations for the protection against

corrosion of iron and steel in structures - Part 2: Hot dip galvanizing (ISO 14713-2:2009)

EN ISO 14284, Steel and iron - Sampling and preparation of samples for the determination of chemical

composition (ISO 14284)

EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules

(ISO 15607)

EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials - Welding

procedure specification - Part 1: Arc welding (ISO 15609-1)
---------------------- Page: 8 ----------------------
SIST EN 10219-3:2020
EN 10219-3:2020 (E)

EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials - Welding

procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO

15614-1)

ISO 11484, Steel products - Employer's qualification system for non-destructive testing (NDT) personnel

SNT TC-1A, Personnel Qualification and Certification in Nondestructive Testing
3 Terms, definitions and symbols
3.1 Terms and definitions

For the purposes of this document, the following terms and definitions given in EN 10020, EN 10021,

EN 10266 and EN ISO 4885 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
cold forming

process where the forming to final shape of the welded hollow section is carried out at ambient

temperature

Note 1 to entry: Circular hollow sections produced from normalized strip with a normalized weld seam and

with a cold forming ratio of D/T ≥ 20 may be classified as hot-finished hollow sections.

3.1.2
normalizing rolling for feedstock material

rolling process in which the final deformation is carried out in a certain temperature range leading to a

material condition equivalent to that obtained after normalizing so that the specified values of the

mechanical properties are retained even after subsequent normalizing
3.1.3
thermomechanical rolling for feedstock material

rolling process in which the final deformation is carried out in a certain temperature range leading to a

material condition with certain properties which cannot be achieved or repeated by heat treatment

alone

Note 1 to entry: Thermomechanical rolling can include processes with an increased cooling rate with or without

tempering including self-tempering but excluding direct quenching as well as quenching and tempering.

Note 2 to entry: In some publications the word TMCP (Thermomechanical Control Process) is also used.

3.1.4
steel with improved atmospheric corrosion resistance for feedstock material

steel in which a certain number of alloying elements has been added in order to increase its resistance

to atmospheric corrosion, by forming an auto-protective oxide layer on the base metal under the

influence of weather conditions

Note 1 to entry: Steel with improved atmospheric corrosion resistance is often called weathering steel.

Note 2 to entry: Additional information for the use of steel with improved atmospheric corrosion resistance is

given in Annex E.
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
3.1.5
quenching and tempering for feedstock material
process which consists of the following two steps:

— first quenching, where the steel is heated up above the Ac temperature and then rapidly cooled

down in liquids to create a process specific grain structure;

— afterwards tempering, during which the steel is heated up to a certain temperature to adjust the

desired properties and cooled down in air afterwards
3.1.6
fine grain steel

steel with fine grain structure with an equivalent index of ferritic grain size ≥ 6

Note 1 to entry: For the determination of grain sizes, see EN ISO 643.
3.1.7
hot-dip zinc coating

application of a zinc coating by immersing the prepared strip or hollow section in a molten bath

containing a zinc content of at least 98%
3.2 Symbols
For the purposes of this document, the symbols defined in EN 10266 apply.
4 Classification and designation
4.1 Classification

4.1.1 Within the grades of steels given in Annex B, C and D seven qualities N, NL, M, ML, Q, QL and QL1

are specified. These differ in respect of the carbon, sulphur and phosphorus content, low temperature

impact properties, production process, heat treatment and grain size.

In accordance with the classification system in EN 10020, all steel grades are alloy special steels.

4.1.2 Within the grades of steels given in Annex E, three qualities J0, J2 and K2 are specified. These

differ in respect of specified impact requirements and limits on values of various elements.

In accordance with the classification system in EN 10020, all steel grades in Annex E are alloy special

steels.
4.2 Designation

4.2.1 For the products covered by this document, the steel names are allocated in accordance with

EN 10027-1; the steel numbers are allocated in accordance with EN 10027-2.
---------------------- Page: 10 ----------------------
SIST EN 10219-3:2020
EN 10219-3:2020 (E)
4.2.2 The designation of steel hollow sections consists of:
a) the number of this document (EN 10219-3);
b) the capital letter S for structural steel;

c) the indication of the minimum specified yield strength for thicknesses ≤ 16 mm expressed in MPa;

d) further designations for either:
1) normalized/normalized rolled structural steels:

i) capital letter N to indicate normalized or normalized rolled with specified impact

properties at −20 °C (see 6.4);

ii) capital letters NL for qualities with specified impact properties at –50 °C; or

2) thermomechanical rolled structural steels:

i) capital letter M to indicate thermomechanical rolled with specified impact properties at

−20 °C (see 6.4);

ii) capital letters ML for qualities with specified impact properties at –50 °C; or

3) structural steels in the quenched and tempered condition:

i) capital letter Q to indicate the quenched and tempered condition with specified impact

properties at −20 °C (see 6.4);

ii) capital letters QL or QL1 for qualities with specified impact properties at –40 or –50 °C; or

4) steels with improved atmospheric corrosion resistance:

ii) the characters J0 for the qualities with specified impact properties at 0 °C;

ii) the characters J2 or K2 for the qualities with specified impact properties at −20 °C; and

iii) the letter W (weather) for improved atmospheric corrosion resistance; and;
e) the capital letter H to indicate hollow sections.

EXAMPLE 1 Hollow section made of structural steel (S) with a specified minimum yield strength for thickness

not greater than 16 mm of 460 MPa, quenched and tempered condition (Q), with a minimum impact energy value

of 30 J at −20 °C, hollow section (H):
EN 10219-3 — S460QH
EN 10219-3 — 1.8608
---------------------- Page: 11 ----------------------
SIST EN 10219-3:2020
EN 10219-3:2020 (E)

EXAMPLE 2 Hollow section made of structural steel (S) with a specified minimum yield strength for thickness

not greater than 16 mm of 355 MPa, with a minimum impact energy value of 27 J at −20 °C (J2), weather resistant

steel (W), hollow section (H):
EN 10219-3 — S355J2WH
EN 10219-3 — 1.8645
5 Information to be obtained by the manufacturer
5.1 Mandatory information

The following information shall be contained in the order document at the time of enquiry and order:

a) the quantity (mass or total length);
b) details of the product form:
1) CFCHS = cold formed circular hollow section;
2) CFRHS = cold formed square or rectangular hollow section;
3) CFEHS = cold formed elliptical hollow section;
c) the name of the standard for dimensions and tolerances (EN 10219-2);

d) the dimensions and the type of length, length range or length (see EN 10219-2);

e) the steel designation (see 4.2).
5.2 Options

A number of options are specified in EN 10219-2 and this document. These are listed below with

appropriate clause references. In the event that the purchaser does not indicate a wish to implement

any of these options at the time of enquiry and order, the hollow sections shall be supplied in

accordance with the basic specification.
3.1 Internal weld bead trimmed (see 6.5.2);
3.2 Other surface condition than as rolled (see 6.6);
3.3 Product analysis (see 7.1.1);
3.4 Empty;
3.5 Tensile test in corner region (see 7.2.1);
3.6 Impact test in corner region (see 7.2.2);
3.7 Verification of impact properties for quality J0 (see 7.2.3);

3.8 The product shall have a chemical composition suitable for hot-dip-zinc coating (see 7.3.2);

3.9 Weld repairs to the body of structural steel hollow sections are permitted (see 7.4.4);

3.10 Full peripheral NDT (non-destructive testing) of the circular tube for imperfections – not

possible for elliptical, rectangular, square and SAW (submerged arc welded) hollow sections (see

7.5);
---------------------- Page: 12 ----------------------
SIST EN 10219-3:2020
EN 10219-3:2020 (E)
3.11 Ultrasonic testing for laminar imperfections (see 7.5);

3.12 Inspection certificate 3.1 for steel grade S355J0WH of Annex E instead of a test report 2.2 (see

8.1);
3.13 Inspection certificate 3.2.
5.3 Example of an order

10 t cold formed welded square hollow sections in accordance with EN 10219-2 with specified outside

dimensions 100 mm × 100 mm and wall thickness of 8 mm of 12 m approximate lengths, grade S460QH

according to this document and chemical composition for hot-dip zinc coating (Option 3.8) and supplied

with inspection certificate 3.1:
EXAMPLE 10 t – CFRHS – EN 10219-2 — 100 × 100 × 8 – approximate length 12 m
EN 10219-3 — S460QH – Option 3.8
6 Manufacturing process
6.1 General

Structural welded cold formed hollow sections of normalized/normalized rolled, thermomechanical

rolled and quenched and tempered steels shall conform to Annexes B to D and steels with improved

atmospheric corrosion resistance shall conform to the requirements of Annex E.

In addition, the general technical delivery requirements specified in EN 10021 shall apply.

6.2 Steel manufacturing process

6.2.1 The steel manufacturing process shall be at the discretion of the hollow section manufacturer

with the exception that the open hearth (Siemens-Martin) process shall not be employed.

6.2.2 The method of deoxidation shall be as specified in Tables B.1, C.1, D.1 and E.1.

6.3 Grain structure

The steel grades given in Annexes B to D shall have a ferritic grain size equal to or finer than 6 when

measured in accordance with EN ISO 643 (see 7.2.4).
6.4 Condition of feedstock material

According to the designation given in the order the following delivery conditions apply for the feedstock

material used for the manufacture of cold formed hollow sections:

— normalized/normalized rolled for steels of qualities N and NL according to Annex B;

— thermomecha
...

SLOVENSKI STANDARD
SIST EN 10219-3:2020
01-november-2020

Hladno oblikovani varjeni votli konstrukcijski profili iz jekla - 3. del: Tehnični

dobavni pogoji za jekla z visoko trdnostjo in vodoodporna
Cold formed welded steel structural hollow sections - Part 3: Technical delivery
conditions for high strength and weather resistant steels
Kaltgeformte geschweißte Hohlprofile für den Stahlbau - Teil 3: Technische
Lieferbedingungen für Anwendungen im Maschinenbau

Profils creux de construction en acier, soudés et formés à froid - Partie 3 : Conditions

techniques de livraison pour des applications de construction mécanique
Ta slovenski standard je istoveten z: EN 10219-3:2020
ICS:
77.140.45 Nelegirana jekla Non-alloyed steels
77.140.70 Jekleni profili Steel profiles
SIST EN 10219-3:2020 en,fr,de

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

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SIST EN 10219-3:2020
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SIST EN 10219-3:2020
EN 10219-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 77.140.75
English Version
Cold formed welded steel structural hollow sections - Part
3: Technical delivery conditions for high strength and
weather resistant steels

Profils creux de construction en acier, soudés et formés Kaltgeformte geschweißte Hohlprofile für den Stahlbau

à froid - Partie 3 : Conditions techniques de livraison - Teil 3: Technische Lieferbedingungen für höher- und

des aciers à haute limite élastique et des aciers à wetterfeste Stähle
résistance améliorée à la corrosion atmosphérique
This European Standard was approved by CEN on 10 August 2020.

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. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists 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, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10219-3:2020 E

worldwide for CEN national Members.
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms, definitions and symbols ................................................................................................................. 7

3.1 Terms and definitions ................................................................................................................................... 7

3.2 Symbols ............................................................................................................................................................... 8

4 Classification and designation .................................................................................................................... 8

4.1 Classification ..................................................................................................................................................... 8

4.2 Designation........................................................................................................................................................ 8

5 Information to be obtained by the manufacturer ............................................................................ 10

5.1 Mandatory information ............................................................................................................................. 10

5.2 Options ............................................................................................................................................................. 10

5.3 Example of an order .................................................................................................................................... 11

6 Manufacturing process ............................................................................................................................... 11

6.1 General ............................................................................................................................................................. 11

6.2 Steel manufacturing process .................................................................................................................... 11

6.3 Grain structure .............................................................................................................................................. 11

6.4 Condition of feedstock material .............................................................................................................. 11

6.5 Structural hollow section manufacturing process ........................................................................... 11

6.6 Delivery condition ....................................................................................................................................... 12

7 Requirements ................................................................................................................................................ 12

7.1 Chemical composition ................................................................................................................................ 12

7.2 Mechanical properties ................................................................................................................................ 15

7.3 Technological properties .......................................................................................................................... 16

7.4 Product supply condition .......................................................................................................................... 17

7.5 Non-destructive testing.............................................................................................................................. 17

7.6 Tolerances and mass ................................................................................................................................... 17

8 Inspection ....................................................................................................................................................... 18

8.1 Types of inspection ...................................................................................................................................... 18

8.2 Types and contents of inspection documents .................................................................................... 18

8.3 Summary of inspection .............................................................................................................................. 19

9 Frequency of testing and preparation of samples and test pieces ............................................. 20

9.1 Frequency of tests ........................................................................................................................................ 20

9.2 Selection and preparation of samples for product analysis ......................................................... 21

9.3 Location and orientation of samples for mechanical tests ........................................................... 21

9.4 Preparation of test pieces for mechanical tests ................................................................................ 22

10 Test methods ................................................................................................................................................. 22

10.1 Chemical analysis ......................................................................................................................................... 22

10.2 Mechanical tests ........................................................................................................................................... 22

10.3 Visual inspection and dimensional check ........................................................................................... 23

10.4 Non-destructive testing.............................................................................................................................. 23

10.5 Retests, sorting and reprocessing .......................................................................................................... 24

11 Marking ............................................................................................................................................................ 24

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EN 10219-3:2020 (E)

Annex A (informative) Structural hollow sections of non-alloy quality steels - Chemical

composition and mechanical properties ............................................................................................. 26

Annex B (normative) Structural hollow sections of normalized/normalized rolled steels -

Chemical composition and mechanical properties .......................................................................... 27

Annex C (normative) Structural hollow sections of thermomechanical formed steels -

Chemical composition and mechanical properties .......................................................................... 29

Annex D (normative) Structural hollow sections of quenched and tempered steels —

Chemical composition and mechanical properties .......................................................................... 34

Annex E (normative) Structural hollow sections of steels with improved atmospheric

corrosion resistance — Chemical composition and mechanical properties ........................... 39

Annex F (normative) Location of samples and test pieces .......................................................................... 41

Bibliography ................................................................................................................................................................. 43

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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
European foreword

This document (EN 10219-3:2020) has been prepared by Technical Committee CEN/TC 459/SC 3

“Structural steels other than reinforcements”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2021, and conflicting national standards shall

be withdrawn at the latest by March 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

EN 10219 consists of the following parts:

— EN 10219-1, Cold formed welded steel structural hollow sections - Part 1: Technical delivery

conditions

— EN 10219-2, Cold formed welded steel structural hollow sections - Part 2: Tolerances, dimensions

and sectional properties

— EN 10219-3, Cold formed welded steel structural hollow sections - Part 3: Technical delivery

conditions for high strength and weather resistant steels.

It forms part of a series of standards on hollow sections together with EN 10210-1 to EN 10210-3.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: 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, Turkey and the

United Kingdom.
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
1 Scope

This document specifies the technical delivery conditions for high strength and weather resistant

electric welded and submerged arc welded cold formed steel structural hollow sections of circular,

square, rectangular or elliptical forms and formed cold without subsequent heat treatment other than

the heat treatment of the weld line.

NOTE 1 The requirements for tolerances, dimensions and sectional properties can be found in EN 10219-2.

NOTE 2 The attention of users is drawn to the fact that whilst cold formed grades in this document can have

equivalent mechanical properties to hot-finished grades in EN 10210-3, the sectional properties of square and

rectangular hollow sections in EN 10219-2 and EN 10210-2 are not equivalent.

NOTE 3 A range of steel grades is specified in this document and the user can select the grade most appropriate

to the intended use and service conditions. The grades and mechanical properties, but not the final supply

condition of cold formed hollow sections are generally comparable with those in EN 10025-3, EN 10025-4,

EN 10025-5, EN 10025-6, EN 10149-2 and EN 10149-3.
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 1011-1, Welding - Recommendations for welding of metallic materials - Part 1: General guidance for

arc welding

EN 1011-2, Welding - Recommendations for welding of metallic materials - Part 2: Arc welding of ferritic

steels
EN 10020, Definition and classification of grades of steel
EN 10021, General technical delivery conditions for steel products
EN 10027-1, Designation systems for steels - Part 1: Steel names
EN 10027-2, Designation systems for steels - Part 2: Numerical system

EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection

method)

EN 10168, Steel products - Inspection documents - List of information and description

EN 10204, Metallic products - Types of inspection documents

EN 10219-1, Cold formed welded structural hollow sections of non-alloy and fine grain steels - Part 1:

Technical delivery conditions

EN 10219-2, Cold formed welded steel structural hollow sections - Part 2: Tolerances, dimensions and

sectional properties

CEN/TR 10261, Iron and steel - European standards for the determination of chemical composition

EN 10266, Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in

product standards

EN ISO 148-1, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-1)

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EN 10219-3:2020 (E)

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

testing (ISO 377)

EN ISO 643, Steels - Micrographic determination of the apparent grain size (ISO 643)

EN ISO 2566-1, Steel - Conversion of elongation values - Part 1: Carbon and low alloy steels (ISO 2566-1)

EN ISO 4885, Ferrous materials - Heat treatments - Vocabulary (ISO 4885)

EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO

6892-1)

EN ISO 9606-1, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1)

EN ISO 9712, Non-destructive testing - Qualification and certification of NDT personnel (ISO 9712)

EN ISO 10893-2, Non-destructive testing of steel tubes - Part 2: Automated eddy current testing of

seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections (ISO

10893-2)

EN ISO 10893-3, Non-destructive testing of steel tubes - Part 3: Automated full peripheral flux leakage

testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection

of longitudinal and/or transverse imperfections (ISO 10893-3)

EN ISO 10893-6, Non-destructive testing of steel tubes - Part 6: Radiographic testing of the weld seam of

welded steel tubes for the detection of imperfections (ISO 10893-6)

EN ISO 10893-7, Non-destructive testing of steel tubes - Part 7: Digital radiographic testing of the weld

seam of welded steel tubes for the detection of imperfections (ISO 10893-7)

EN ISO 10893-8, Non-destructive testing of steel tubes - Part 8: Automated ultrasonic testing of seamless

and welded steel tubes for the detection of laminar imperfections (ISO 10893-8)

EN ISO 10893-9, Non-destructive testing of steel tubes - Part 9: Automated ultrasonic testing for the

detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes (ISO

10893-9)

EN ISO 10893-10, Non-destructive testing of steel tubes - Part 10: Automated full peripheral ultrasonic

testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal

and/or transverse imperfections (ISO 10893-10)

EN ISO 10893-11, Non-destructive testing of steel tubes - Part 11: Automated ultrasonic testing of the

weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections (ISO

10893-11)

EN ISO 14713-2:2009, Zinc coatings - Guidelines and recommendations for the protection against

corrosion of iron and steel in structures - Part 2: Hot dip galvanizing (ISO 14713-2:2009)

EN ISO 14284, Steel and iron - Sampling and preparation of samples for the determination of chemical

composition (ISO 14284)

EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules

(ISO 15607)

EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials - Welding

procedure specification - Part 1: Arc welding (ISO 15609-1)
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EN 10219-3:2020 (E)

EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials - Welding

procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO

15614-1)

ISO 11484, Steel products - Employer's qualification system for non-destructive testing (NDT) personnel

SNT TC-1A, Personnel Qualification and Certification in Nondestructive Testing
3 Terms, definitions and symbols
3.1 Terms and definitions

For the purposes of this document, the following terms and definitions given in EN 10020, EN 10021,

EN 10266 and EN ISO 4885 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
cold forming

process where the forming to final shape of the welded hollow section is carried out at ambient

temperature

Note 1 to entry: Circular hollow sections produced from normalized strip with a normalized weld seam and

with a cold forming ratio of D/T ≥ 20 may be classified as hot-finished hollow sections.

3.1.2
normalizing rolling for feedstock material

rolling process in which the final deformation is carried out in a certain temperature range leading to a

material condition equivalent to that obtained after normalizing so that the specified values of the

mechanical properties are retained even after subsequent normalizing
3.1.3
thermomechanical rolling for feedstock material

rolling process in which the final deformation is carried out in a certain temperature range leading to a

material condition with certain properties which cannot be achieved or repeated by heat treatment

alone

Note 1 to entry: Thermomechanical rolling can include processes with an increased cooling rate with or without

tempering including self-tempering but excluding direct quenching as well as quenching and tempering.

Note 2 to entry: In some publications the word TMCP (Thermomechanical Control Process) is also used.

3.1.4
steel with improved atmospheric corrosion resistance for feedstock material

steel in which a certain number of alloying elements has been added in order to increase its resistance

to atmospheric corrosion, by forming an auto-protective oxide layer on the base metal under the

influence of weather conditions

Note 1 to entry: Steel with improved atmospheric corrosion resistance is often called weathering steel.

Note 2 to entry: Additional information for the use of steel with improved atmospheric corrosion resistance is

given in Annex E.
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EN 10219-3:2020 (E)
3.1.5
quenching and tempering for feedstock material
process which consists of the following two steps:

— first quenching, where the steel is heated up above the Ac temperature and then rapidly cooled

down in liquids to create a process specific grain structure;

— afterwards tempering, during which the steel is heated up to a certain temperature to adjust the

desired properties and cooled down in air afterwards
3.1.6
fine grain steel

steel with fine grain structure with an equivalent index of ferritic grain size ≥ 6

Note 1 to entry: For the determination of grain sizes, see EN ISO 643.
3.1.7
hot-dip zinc coating

application of a zinc coating by immersing the prepared strip or hollow section in a molten bath

containing a zinc content of at least 98%
3.2 Symbols
For the purposes of this document, the symbols defined in EN 10266 apply.
4 Classification and designation
4.1 Classification

4.1.1 Within the grades of steels given in Annex B, C and D seven qualities N, NL, M, ML, Q, QL and QL1

are specified. These differ in respect of the carbon, sulphur and phosphorus content, low temperature

impact properties, production process, heat treatment and grain size.

In accordance with the classification system in EN 10020, all steel grades are alloy special steels.

4.1.2 Within the grades of steels given in Annex E, three qualities J0, J2 and K2 are specified. These

differ in respect of specified impact requirements and limits on values of various elements.

In accordance with the classification system in EN 10020, all steel grades in Annex E are alloy special

steels.
4.2 Designation

4.2.1 For the products covered by this document, the steel names are allocated in accordance with

EN 10027-1; the steel numbers are allocated in accordance with EN 10027-2.
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
4.2.2 The designation of steel hollow sections consists of:
a) the number of this document (EN 10219-3);
b) the capital letter S for structural steel;

c) the indication of the minimum specified yield strength for thicknesses ≤ 16 mm expressed in MPa;

d) further designations for either:
1) normalized/normalized rolled structural steels:

i) capital letter N to indicate normalized or normalized rolled with specified impact

properties at −20 °C (see 6.4);

ii) capital letters NL for qualities with specified impact properties at –50 °C; or

2) thermomechanical rolled structural steels:

i) capital letter M to indicate thermomechanical rolled with specified impact properties at

−20 °C (see 6.4);

ii) capital letters ML for qualities with specified impact properties at –50 °C; or

3) structural steels in the quenched and tempered condition:

i) capital letter Q to indicate the quenched and tempered condition with specified impact

properties at −20 °C (see 6.4);

ii) capital letters QL or QL1 for qualities with specified impact properties at –40 or –50 °C; or

4) steels with improved atmospheric corrosion resistance:

ii) the characters J0 for the qualities with specified impact properties at 0 °C;

ii) the characters J2 or K2 for the qualities with specified impact properties at −20 °C; and

iii) the letter W (weather) for improved atmospheric corrosion resistance; and;
e) the capital letter H to indicate hollow sections.

EXAMPLE 1 Hollow section made of structural steel (S) with a specified minimum yield strength for thickness

not greater than 16 mm of 460 MPa, quenched and tempered condition (Q), with a minimum impact energy value

of 30 J at −20 °C, hollow section (H):
EN 10219-3 — S460QH
EN 10219-3 — 1.8608
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)

EXAMPLE 2 Hollow section made of structural steel (S) with a specified minimum yield strength for thickness

not greater than 16 mm of 355 MPa, with a minimum impact energy value of 27 J at −20 °C (J2), weather resistant

steel (W), hollow section (H):
EN 10219-3 — S355J2WH
EN 10219-3 — 1.8645
5 Information to be obtained by the manufacturer
5.1 Mandatory information

The following information shall be contained in the order document at the time of enquiry and order:

a) the quantity (mass or total length);
b) details of the product form:
1) CFCHS = cold formed circular hollow section;
2) CFRHS = cold formed square or rectangular hollow section;
3) CFEHS = cold formed elliptical hollow section;
c) the name of the standard for dimensions and tolerances (EN 10219-2);

d) the dimensions and the type of length, length range or length (see EN 10219-2);

e) the steel designation (see 4.2).
5.2 Options

A number of options are specified in EN 10219-2 and this document. These are listed below with

appropriate clause references. In the event that the purchaser does not indicate a wish to implement

any of these options at the time of enquiry and order, the hollow sections shall be supplied in

accordance with the basic specification.
3.1 Internal weld bead trimmed (see 6.5.2);
3.2 Other surface condition than as rolled (see 6.6);
3.3 Product analysis (see 7.1.1);
3.4 Empty;
3.5 Tensile test in corner region (see 7.2.1);
3.6 Impact test in corner region (see 7.2.2);
3.7 Verification of impact properties for quality J0 (see 7.2.3);

3.8 The product shall have a chemical composition suitable for hot-dip-zinc coating (see 7.3.2);

3.9 Weld repairs to the body of structural steel hollow sections are permitted (see 7.4.4);

3.10 Full peripheral NDT (non-destructive testing) of the circular tube for imperfections – not

possible for elliptical, rectangular, square and SAW (submerged arc welded) hollow sections (see

7.5);
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SIST EN 10219-3:2020
EN 10219-3:2020 (E)
3.11 Ultrasonic testing for laminar imperfections (see 7.5);

3.12 Inspection certificate 3.1 for steel grade S355J0WH of Annex E instead of a test report 2.2 (see

8.1);
3.13 Inspection certificate 3.2.
5.3 Example of an order

10 t cold formed welded square hollow sections in accordance with EN 10219-2 with specified outside

dimensions 100 mm × 100 mm and wall thickness of 8 mm of 12 m approximate lengths, grade S460QH

according to this document and chemical composition for hot-dip zinc coating (Option 3.8) and supplied

with inspection certificate 3.1:
EXAMPLE 10 t – CFRHS – EN 10219-2 — 100 × 100 × 8 – approximate length 12 m
EN 10219-3 — S460QH – Option 3.8
6 Manufacturing process
6.1 General

Structural welded cold formed hollow sections of normalized/normalized rolled, thermomechanical

rolled and quenched and tempered steels shall conform to Annexes B to D and steels with improved

atmospheric corrosion resistance shall conform to the requirements of Annex E.

In addition, the general technical delivery requirements specified in EN 10021 shall apply.

6.2 Steel manufacturing process

6.2.1 The steel manufacturing process shall be at the discretion of the hollow section manufacturer

with the exception that the open hearth (Siemens-Martin) process shall not be employed.

6.2.2 The method of deoxidation shall be as specified in Tables B.1, C.1, D.1 and E.1.

6.3 Grain structure

The steel grades given in Annexes B to D shall have a ferritic grain size equal to or finer than 6 when

measured in accordance with EN ISO 643 (see 7.2.4).
6.4 Condition of feedstock material

According to the designation given in the order the following delivery conditions apply for the feedstock

material used for the manufacture of cold formed hollow sections:

— normalized/normalized rolled for steels of qualities N and NL according to Annex B;

— thermomechanical rolled for steels of quality M and ML according to Annex C;
— quenched and tempered for steels of qualities Q, QL
...

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